JP2005232018A - Two-pack type adhesive for astylar enamel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prepare an adhesive which has excellent storage stability and develops excellent adhesive force on the adhesion of human tooth astylar enamel having high acid resistance to a dental restoring material. <P>SOLUTION: This two-pack type adhesive used for astylar enamels comprises the first liquid compounded with a sulfonic group-containing polymerizable monomer (a) having a methacrylamide group and/or an acrylamide group and the second liquid compounded with an acidic group-containing polymerizable monomer salt (b), wherein water (c) and a water-soluble solvent (d) are compounded in the first liquid and/or the second liquid, respectively, and an adhesion method using the same is also provided. The two-pack type adhesive develops excellent adhesive force for human tooth astylar enamels having high acid resistance, even when a long period passes after produced, because of having excellent storage stability. By the adhesion method, the astylar enamel can simply be adhered to the dental restoring material without giving such a damage as eliminating the gloss of teeth to the teeth or discoloring the teeth. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an adhesive used for dental treatments for columnar enamel such as orthodontics, dental caries prevention, and aesthetic restoration (for example, tooth nail polish).

  The columnar enamel that constitutes the outermost layer of the tooth is different in composition and crystal structure from the enamel trabeculae that are composed of the enamel trabeculae and trabecular interstitium, etc. high. Examples of dental treatments for such columnar enamel include prevention of dental caries and orthodontic treatment of pits and fissures, adjacent tooth surfaces, and the like. These dental treatments that do not necessarily require cutting of the teeth by a turbine or the like are generally started by decalcifying and roughening the surface of the teeth with a phosphoric acid etching agent (phosphoric acid aqueous solution).

  However, the phosphoric acid etchant decalcifies teeth more than necessary. As a result, the enamel trabecular portion having low acid resistance inside the pillarless enamel layer is exposed on the surface of the tooth, and caries bacteria may invade from the exposed portion to cause crushing.

  Further, due to excessive decalcification, the gloss of the tooth may be lost, or plaque, protein, pigment, etc. may be deposited and the surface of the tooth may be discolored.

  Furthermore, if the phosphoric acid etching agent with strong demineralization power is used for orthodontic treatment that requires removal of the bracket (orthodontic member) used for treatment after treatment, the resin used to fix the bracket Part of the (adhesive and orthodontic composite resin) may penetrate too much into the enamel trabeculae or trabecular stroma, making it difficult to remove the bracket.

  Furthermore, it is clinically difficult to apply the phosphoric acid etching treatment only to the site to be treated strictly even though the tooth damage caused by the phosphoric acid etching treatment should be kept to the minimum necessary. In some cases, the tooth may be damaged to the part that is not needed.

  The above-mentioned adverse effects caused by excessive decalcification with a phosphoric acid etching agent are, for example, by applying a phosphoric acid etching treatment after applying a masking material such as enamel protective varnish in advance to a portion that does not require treatment, Can prevent to some extent. However, it is difficult to completely protect a portion that does not require treatment from demineralization with a masking material, and the bonding operation becomes complicated by the addition of the masking process. In addition, when an acid etching agent such as a phosphoric acid etching agent is used, it is necessary to completely remove it by a water washing treatment after the etching treatment, and when this water washing treatment is insufficient, the adhesiveness is significantly reduced. In addition, the bonding operation becomes complicated by the addition of each step of washing with water and subsequent drying.

  1 which contains an acidic group-containing polymerizable monomer, a water-soluble solvent, and water as an adhesive composition that can easily perform an adhesion operation and expresses an excellent adhesive force to a pillarless enamel. A liquid adhesive composition has been proposed (see Patent Document 1 below). Thus, Patent Document 1 proposes to use a phosphate group-containing polymerizable monomer and a sulfonic acid group-containing polymerizable monomer in combination as the acidic group-containing polymerizable monomer. (See Patent Document 1, [0012], [0016], [0018], etc.).

JP 2002-226314 A

  Since the phosphoric acid group-containing polymerizable monomer has a strong chemical bonding force to the tooth, it exhibits an excellent adhesive force. In addition, the sulfonic acid group-containing polymerizable monomer has a very strong acidity, although its chemical bond strength to the tooth is weaker than that of the phosphoric acid group-containing polymerizable monomer. Excellent demineralization power is exhibited even for no-column enamel. Therefore, among the one-component adhesive compositions described in Patent Document 1, a phosphoric acid group-containing polymerizable monomer and a sulfonic acid group-containing polymerizable monomer are used in combination as the acidic group-containing polymerizable monomer. Due to the synergistic effect of these two kinds of acidic group-containing polymerizable monomers, it exhibits excellent adhesive strength over a long period after bonding even to the pillarless enamel of human teeth with high acid resistance.

  However, as a result of investigations by the present inventors, the above-mentioned one-component adhesive composition in which a phosphate group-containing polymerizable monomer and a sulfonic acid group-containing polymerizable monomer are used in combination has been Although it exhibits excellent adhesive strength, it has been found that there is a problem that the adhesive strength is greatly reduced when stored for a long period of time.

  The present invention has been made to solve the above-mentioned problems of the one-component adhesive composition, and includes a columnar enamel of human teeth having high acid resistance, a dental restorative material (composite resin, The purpose of the present invention is to provide an adhesive with excellent storage stability that exhibits excellent adhesive strength even after a long period of time in manufacturing, such as cement, resin cured products, metal materials, porcelain, and ceramics). And In addition, another present invention provides a method for bonding columnless enamel and a dental restorative material easily and without damaging or discoloring the tooth so as to lose its luster due to excessive decalcification. It is an object of the present invention to provide an adhesion method that can be used.

  In order to achieve the above object, the two-component adhesive for columnless enamel according to the invention of claim 1 is a polymerizable monomer having a sulfonic acid group having a methacrylamide group and / or an acrylamide group. It consists of a first liquid in which (a) is blended and a second liquid in which a salt (b) of an acidic group-containing polymerizable monomer is blended, and water (c) and water-soluble solvent (d) are respectively , An adhesive blended in the first liquid and / or the second liquid. Hereinafter, the methacrylamide group and the acrylamide group may be collectively referred to as a (meth) acrylamide group.

  In the invention described in claim 2, the salt (b) of the acidic group-containing polymerizable monomer is limited to a phosphate.

  In the invention according to claim 3, the use of the two-component adhesive for columnless enamel according to the invention according to claim 1 or 2 is that the bracket for orthodontic treatment is used on the tooth surface (columnar enamel). It is limited to the adhesive used for fixing to.

  In the invention described in claim 4, the use of the two-component type non-column enamel adhesive according to the invention described in claim 1 or 2 is used when bonding the pit and fissure filling material to the non-column enamel. Limited to pretreatment agents.

  In the invention described in claim 5, the use of the two-component no-column enamel adhesive according to the invention described in claim 1 or 2 is a pretreatment agent used when applying dental nail polish to the no-column enamel. Limited.

  A bonding method according to a sixth aspect of the present invention is a columnar enamel and a dental restorative material using the two-pack type columnar enamel adhesive according to any one of the first to fifth aspects of the present invention. A first liquid and a second liquid are mixed to prepare a one-column no-column enamel adhesive, and the one-column no-column enamel adhesive is etched. Applying to the surface of the pillarless enamel that has not been treated to form an adhesive layer; laminating a dental restorative material on the adhesive layer; and curing the dental restorative material; Have In this specification, the term “for pillarless enamel” is a term indicating that all or a part of the treatment target is pillarless enamel, and that the treatment target is all pillarless enamel. Should not be construed as limiting. The two-component adhesive for columnar enamel according to the present invention is most preferably used for dental treatment in which all or most of the treatment target is columnar enamel, but there is no part of the treatment target. This is because even if it is a pillar enamel, a correspondingly excellent effect can be obtained. In the following, the two-component no-column enamel adhesive according to any one of claims 1 to 5 is referred to as “two-component adhesive according to the present invention”, and claim 6. The bonding method according to the described invention may be referred to as “the bonding method according to the present invention”.

  Since the two-component adhesive according to the present invention is excellent in storage stability, it exhibits excellent adhesive strength even after a long period of time has passed since it was manufactured on a columnar enamel of human teeth having high acid resistance. Further, according to the bonding method according to the present invention, the non-column enamel and the dental restorative material can be bonded easily and without damaging or discoloring the tooth so as to lose its luster. Can do.

  The two-pack type adhesive according to the present invention is blended with the first liquid in which the sulfonic acid group-containing polymerizable monomer (a) is blended and the salt (b) of the acidic group-containing polymerizable monomer. It consists of a 2nd liquid. The two-component adhesive according to the present invention is excellent in storage stability, that is, it exhibits excellent adhesive force for a long period after production, because it is acidic with the sulfonic acid group-containing polymerizable monomer (a). Dividing each compounding destination with the salt (b) of the group-containing polymerizable monomer, the acidic group-containing polymerizable monomer under strong acidity exhibited by the sulfonic acid group-containing polymerizable monomer (a) This is because hydrolysis of the body salt (b) is prevented.

  The sulfonic acid group-containing polymerizable monomer (a) blended in the first liquid has a (meth) acrylamide group as a polymerizable group (polymerizable unsaturated group) in addition to the sulfonic acid group. The sulfonic acid group-containing polymerizable monomer (a) exhibiting extremely strong acidity sufficiently decalcifies the columnar enamel and exposes the components in the columnar enamel. Examples of the sulfonic acid group-containing polymerizable monomer (a) include compounds represented by the following general formulas:

[In the chemical formulas ¹ to 6, R ¹ is H or CH ₃ , n, m, r are each independently an integer of 1-20, and p, q are each independently an integer of 0-20]

  The sulfonic acid group-containing polymerizable monomer (a) may be used alone or in combination of two or more. The blending amount is preferably in the range of 1 to 60% by weight, more preferably in the range of 5 to 40% by weight, based on the total weight of the adhesive (total weight of the first liquid and the second liquid). A weight percent range is most preferred. When the amount is too much or too little, the adhesion to columnar enamel may be reduced.

  The salt (b) of the acidic group-containing polymerizable monomer blended in the second liquid is a component exposed on the surface layer of the columnar enamel by the decalcification action of the sulfonic acid group-containing polymerizable monomer (a) ( A resin layer having a high acid resistance and high adhesive strength comprising a component other than calcium salt of an acidic group-containing polymerizable monomer (b1), an adhesive component, and no-column enamel calcium. Form. However, this resin layer can be easily broken by a bracket remover or the like. Therefore, after orthodontic treatment, it is possible to remove the bracket without damaging the teeth. Among the salts (b) of acidic group-containing polymerizable monomers, alkali metal salts and amine salts are often hydrophilic, and when these acidic group-containing polymerizable monomers are used, It is suitable because of its good permeability. Moreover, the reaction cured product of the salt (b) of the acidic group-containing polymerizable monomer and the component exposed on the surface layer of the columnar enamel is hydrophobic and therefore has good water resistance. For this reason, the salt (b) of the acidic group-containing polymerizable monomer exhibits excellent adhesive force even in the oral cavity where water (water contained in saliva or food and drink) is always present.

  The salt (b) of the acidic group-containing polymerizable monomer is a salt of the acidic group-containing polymerizable monomer (b1) and the basic compound (b2). It is not necessarily limited to neutral salts. As the salt (b) of the acidic group-containing polymerizable monomer, in terms of storage stability, a salt in which the pH of the solution when dissolved in 95 g of water is in the range of 2.0 to 10.0 is used. Preferably, salts having the same pH in the range of 3.0 to 9.0 are more preferable, and salts having the same pH in the range of 4.0 to 8.0 are most preferable.

The acidic group-containing polymerizable monomer (b1) includes a phosphoric acid group (phosphinico group: = P (═O) OH, phosphono group: —P (═O) (OH) ₂ ), pyrophosphate group (—P ( = O) (OH) -OP (= O) (OH)-), carboxylic acid group (carboxyl group: -C (= O) OH, acid anhydride group: -C (= O) -O-C (= O)-), at least one acidic group such as sulfonic acid group (sulfo group: —SO ₃ H), and polymerizable unsaturated such as acryloyl group, methacryloyl group, vinyl group, vinylbenzyl group It is a monomer having a group (polymerizable group). Specific examples thereof include the following. Hereinafter, methacryloyl and acryloyl may be collectively referred to as “(meth) acryloyl”.

  Examples of the phosphoric acid group-containing polymerizable monomer (b1-1) include 2- (meth) acryloyloxyethyl dihydrogen phosphate, 3- (meth) acryloyloxypropyl dihydrogen phosphate, 4- (meth) acryloyloxy. Butyl dihydrogen phosphate, 5- (meth) acryloyloxypentyl dihydrogen phosphate, 6- (meth) acryloyloxyhexyl dihydrogen phosphate, 7- (meth) acryloyloxyheptyl dihydrogen phosphate, 8- (meth) Acryloyloxyoctyl dihydrogen phosphate, 9- (meth) acryloyloxynonyl dihydrogen phosphate, 10- (meth) acryloyloxydecyl dihydrogen phosphate, 11- (meth) Acryloyloxyundecyl dihydrogen phosphate, 12- (meth) acryloyl oxide decyl dihydrogen phosphate, 16- (meth) acryloyloxy hexadecyl dihydrogen phosphate, 20- (meth) acryloyloxyeicosyl dihydrogen phosphate Bis [2- (meth) acryloyloxyethyl] hydrogen phosphate, bis [4- (meth) acryloyloxybutyl] hydrogen phosphate, bis [6- (meth) acryloyloxyhexyl] hydrogen phosphate, bis [8- (Meth) acryloyloxyoctyl] hydrogen phosphate, bis [9- (meth) acryloyloxynonyl] hydrogen phosphate, bis [10- (meth) acrylo Ruoxydecyl] hydrogen phosphate, 1,3-di (meth) acryloyloxypropyl-2-dihydrogen phosphate, 2- (meth) acryloyloxyethyl phenylhydrogen phosphate, 2- (meth) acryloyloxyethyl 2-bromoethyl Hydrogen phosphate, 2- (meth) acryloyloxyethyl phenylphosphonate, (5-methacryloxy) pentyl-3-phosphonopropionate, (6-methacryloxy) hexyl-3-phosphonopropionate, (10-methacryloxy) Decyl-3-phosphonopropionate, (6-methacryloxy) hexyl-3-phosphonoacetate, (10-methacryloxy) decyl-3-phosphonoacetate, 2-methacryloyloxyethyl (4- Tokishifeniru) hydrogen phosphate, 2-methacryloyloxypropyl (4-methoxyphenyl) hydrogen phosphate and chloride these acids are exemplified.

  Examples of the pyrophosphate group-containing polymerizable monomer (b1-2) include bis [6- (meth) acryloyloxyhexyl) pyrophosphate, bis [7- (meth) acryloyloxyheptyl] pyrophosphate, bis [8 -(Meth) acryloyloxyoctyl], bis [9- (meth) acryloyloxynonyl] pyrophosphate, bis [10- (meth) acryloyloxydecyl] pyrophosphate, bis [12- (meth) acryloyloxide decyl] pyrophosphate And their acid chlorides.

  Examples of the carboxylic acid group-containing polymerizable monomer (b1-3) include maleic acid, methacrylic acid, 4- (meth) acryloyloxyethoxycarbonylphthalic acid, 4- (meth) acryloyloxybutyloxycarbonylphthalic acid, 4- (Meth) acryloyloxyhexyloxycarbonylphthalic acid, 4- (meth) acryloyloxyoctyloxycarbonylphthalic acid, 4- (meth) acryloyloxydecyloxycarbonylphthalic acid and acid anhydrides thereof; 5- (meth) acryloylamino Pentylcarboxylic acid, 6- (meth) acryloyloxy-1,1-hexanedicarboxylic acid, 8- (meth) acryloyloxy-1,1-octanedicarboxylic acid, 10- (meth) acryloyloxy-1,1-decanedicarboxylic acid Acid, 11- (meth) acryloyl 1,1-undecane dicarboxylic acid and acid chlorides and the like.

  Examples of the sulfonic acid group-containing polymerizable monomer (b1-4) include 2- (meth) acrylamido-2-methylpropanesulfonic acid, styrenesulfonic acid, and 2-sulfoethyl (meth) acrylate.

  Examples of the basic compound (b2) include metal hydroxides such as sodium hydroxide, potassium hydroxide, lithium hydroxide, barium hydroxide, calcium hydroxide, aluminum hydroxide, lithium carbonate, sodium carbonate, potassium carbonate, hydrogen carbonate Lithium, sodium bicarbonate, potassium bicarbonate, calcium carbonate, sodium formate, sodium hydrogen oxalate, sodium acetate, potassium acetate, calcium acetate, sodium propionate, sodium borate, sodium dihydrogen phosphite, dihydrogen phosphite Strong basic acid salt formed from a metal and a weak acid having a pKa of 3 or more, such as potassium, sodium dihydrogen phosphate, potassium dihydrogen phosphate, disodium hydrogen phosphate, dipotassium hydrogen phosphate, triethylamine, triethanol Amine, 2-hydroxyethyl methacrylate , Amines such as diethanolamine and the like.

  As the salt (b) of the acidic group-containing polymerizable monomer, a phosphate is preferable, and in particular, an alkyl group having 6 to 20 carbon atoms in the main chain, an alkylene group having 6 to 20 carbon atoms in the main chain, or A phosphate having an aromatic group is preferable because it exhibits excellent adhesive strength. Specific examples thereof include a salt of 6- (meth) acryloyloxyhexyl dihydrogen phosphate, a salt of 7- (meth) acryloyloxyheptyl dihydrogen phosphate, and a salt of 8- (meth) acryloyloxyoctyl dihydrogen phosphate. 9- (meth) acryloyloxynonyl dihydrogen phosphate salt, 10- (meth) acryloyloxydecyl dihydrogen phosphate salt, 11- (meth) acryloyloxyundecyl dihydrogen phosphate salt, 4- ( Examples thereof include a salt of (meth) acryloyloxyethoxycarbonylphthalic acid and a salt of 11- (meth) acryloyloxy-1,1-undecanedicarboxylic acid. Among them, in terms of adhesiveness and storage stability, a salt of 6- (meth) acryloyloxyhexyl dihydrogen phosphate, a salt of 7- (meth) acryloyloxyheptyl dihydrogen phosphate, 8- (meth) acryloyloxyoctyl Dihydrogen phosphate salt, 9- (meth) acryloyloxynonyl dihydrogen phosphate salt, 10- (meth) acryloyloxydecyl dihydrogen phosphate salt, 11- (meth) acryloyloxyundecyl dihydrogen phosphate The salt of is particularly preferred.

  The salt (b) of the acidic group-containing polymerizable monomer may be used alone or in combination of two or more. The blending amount is preferably in the range of 1 to 60% by weight, more preferably in the range of 5 to 40% by weight, and most preferably in the range of 10 to 30% by weight based on the total weight of the adhesive. In the case where the amount is too much or too little, the adhesion to the columnar enamel may be lowered.

  Water (c) is blended in the first liquid and / or the second liquid. Water (c) promotes the decalcification action of the sulfonic acid group-containing polymerizable monomer (a) on the columnar enamel, and is added to the first liquid and / or the second liquid. Improves the penetration of teeth. It is necessary to use one that does not substantially contain impurities that reduce adhesion to pillarless enamel. Distilled water or ion exchange water is preferred. The blending amount is preferably 1 to 90% by weight, more preferably 5 to 80% by weight, and most preferably 10 to 80% by weight based on the total weight of the adhesive. In the case where the amount is too much or too little, the adhesion to the columnar enamel may be lowered.

  A water-soluble solvent (d) is further added to the first liquid and / or the second liquid. The water-soluble solvent (d) has adhesiveness, applicability, penetration into the tooth, and solubility of the polymerizable monomer blended in the first liquid and / or the second liquid with respect to water (c). Improve. The water-soluble solvent (d) is a hydrophilic organic solvent having a solubility in water at 25 ° C. of 5% by weight or more. Those having a solubility of 30% by weight or more are preferred, and those having solubility in water at an arbitrary ratio are more preferred. Specific examples thereof include ethanol, methanol, 1-propanol, isopropyl alcohol, acetone, methyl ethyl ketone, 1,2-dimethoxyethane, 1,2-diethoxyethane, tetrahydrofuran, dimethyl sulfoxide, ethylene glycol, polyethylene glycol, 2-hydroxy. Ethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 1,3-dihydroxypropyl (meth) acrylate, 2,3-dihydroxypropyl (meth) acrylate, 2-trimethylammonium Examples thereof include ethyl (meth) acryl chloride and polyethylene glycol di (meth) acrylate (having 9 or more oxyethylene repeating units). Among these exemplified water-soluble solvents (d), a water-soluble volatile organic solvent (d-1) having a boiling point at normal pressure of 150 ° C. or lower (more preferably 100 ° C. or lower), and a water-soluble polymerizable monomer The monomer (d-2) is preferred. The water-soluble volatile organic solvent (d-1) having a boiling point of 150 ° C. or less at normal pressure is preferable because it can be easily evaporated with a dental air syringe. Specific examples thereof include ethanol, methanol, 1-propanol, isopropyl alcohol, acetone, methyl ethyl ketone, 1,2-dimethoxyethane, 1,2-diethoxyethane, and tetrahydrofuran. Further, the water-soluble polymerizable monomer (d-2) is preferable in that it does not necessarily need to be removed by evaporation with an air syringe or the like because it is polymerized and cured. Specific examples thereof include 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, 3-hydroxypropyl methacrylate, 1,3-dihydroxypropyl methacrylate, 2,3-dihydroxypropyl methacrylate, polyethylene glycol dimethacrylate (oxy And those having an ethylene group having 9 or more repeating units).

  A water-soluble solvent (d) may mix | blend 1 type individually, and may mix | blend multiple types in combination. The blending amount is preferably in the range of 1 to 90% by weight, more preferably in the range of 5 to 80% by weight, and most preferably in the range of 10 to 60% by weight based on the total weight of the adhesive. In the case where the amount is too much or too little, the adhesion to the columnar enamel may be lowered.

  You may mix | blend components other than said essential component (a)-(d) with a 1st liquid and / or a 2nd liquid. For example, in order to improve adhesiveness, mechanical strength or coatability, a sulfonic acid group-containing polymerizable monomer (a), a salt (b) of an acidic group-containing polymerizable monomer and a water-soluble polymerizable monomer You may mix | blend polymerizable monomers other than a body (d-2).

  Examples of the polymerizable monomer include α-cyanoacrylic acid, (meth) acrylic acid, α-halogenated acrylic acid, crotonic acid, cinnamic acid, sorbic acid, maleic acid, itaconic acid, esters of these organic acids, Examples include vinyl esters, vinyl ethers, mono-N-vinyl derivatives, and styrene derivatives. Of these, (meth) acrylic acid esters are preferred.

  (Meth) acrylic acid esters include methyl (meth) acrylate, ethyl (meth) acrylate, isopropyl (meth) acrylate, isobutyl (meth) acrylate, benzyl (meth) acrylate, lauryl (meth) acrylate, 2,3-dibromo Propyl (meth) acrylate, 3-methacryloyloxypropyltrimethoxysilane, 11-methacryloyloxyundecyltrimethoxysilane, ethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, Neopentyl glycol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, 1,10-decanediol di (meth) acrylate, bisphenol A jig Cidyl (meth) acrylate, 2,2-bis [4- (meth) acryloyloxyethoxyphenyl] propane, 2,2-bis [4- (meth) acryloyloxypolyethoxyphenyl] propane, 2,2-bis [4 -[3- (meth) acryloyloxy-2-hydroxypropoxy] phenyl] propane, 1,2-bis [3- (meth) acryloyloxy-2-hydroxypropoxy] ethane, [2,2,4-trimethylhexamethylene Bis (2-carbamoyloxyethyl) dimethacrylate, trimethylolpropane tri (meth) acrylate, trimethylolethane tri (meth) acrylate, tetramethylolmethane tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, N, N ′ -(2,2,4-tri Tilhexamethylene) bis [2- (aminocarboxy) propane-1,3-diol] tetramethacrylate, 1,7-diaacryloyloxy-2,2,6,6-tetraacryloyloxymethyl-4-oxyheptane, 2 -Hydroxypropyl-1,3-di (meth) acrylate, 3-hydroxypropyl-1,2-di (meth) acrylate, pentaerythritol di (meth) acrylate, 10-hydroxydecyl (meth) acrylate are exemplified.

  These polymerizable monomers may be blended singly or in combination of two or more. Usually, the compounding amount of these polymerizable monomers is preferably in a range not exceeding 80% by weight, more preferably not exceeding 70% by weight, and not exceeding 60% by weight based on the total weight of the adhesive. A range is most preferred. When the compounding amount of these polymerizable monomers is excessive, the permeability of the adhesive to the tooth substance may be lowered, and the adhesion property to the enamel may be lowered.

  In order to improve adhesiveness, you may mix | blend a hardening | curing agent. As the curing agent, a known curing agent can be used. Known curing agents include polymerization initiators such as α-diketones, ketals, thioxanthones, acylphosphine oxides, coumarins, halomethyl group-substituted s-triazine derivatives, peroxides, and aromatic tertiary compounds. Examples thereof include polymerization accelerators such as amines, aliphatic tertiary amines, sulfinic acids and salts thereof, aldehydes, and compounds having a thiol group.

  Examples of α-diketones include camphorquinone, benzyl, and 2,3-pentanedione.

  Examples of ketals include benzyl dimethyl ketal and benzyl diethyl ketal.

  Examples of thioxanthones include 2-chlorothioxanthone and 2,4-diethylthioxanthone.

  Acylphosphine oxides include 2,4,6-trimethylbenzoyldiphenylphosphine oxide, bis (2,4,6-trimethylbenzoyl) phenylphosphine oxide, dibenzoylphenylphosphine oxide, and bis (2,6-dimethoxybenzoyl) phenyl. Phosphine oxide, tris (2,4-dimethylbenzoyl) phosphine oxide, tris (2-methoxybenzoyl) phosphine oxide, 2,6-dimethoxybenzoyldiphenylphosphine oxide, 2,6-dichlorobenzoyldiphenylphosphine oxide, 2,3,5 , 6-Tetramethylbenzoyldiphenylphosphine oxide, benzoyl-bis (2,6-dimethylphenyl) phosphonate, 2,4,6-trimethylbenzo Le ethoxyphenyl phosphine oxide are exemplified.

  Examples of the coumarins include 3,3'-carbonylbis (7-diethylamino) coumarin, 3- (4-methoxybenzoyl) coumarin, and 3-chenoylcoumarin.

  Examples of halomethyl group-substituted s-triazine derivatives include 2,4,6-tris (trichloromethyl) -s-triazine, 2,4,6-tris (tribromomethyl) -s-triazine, 2-methyl-4, An example is 6-bis (trichloromethyl) -s-triazine.

  Examples of the peroxide include diacyl peroxides, peroxyesters, dialkyl peroxides, peroxyketals, ketone peroxides, and hydroperoxides. Specific examples of diacyl peroxides include benzoyl peroxide, 2,4-dichlorobenzoyl peroxide, and m-toluoyl peroxide. Specific examples of peroxyesters include t-butyl peroxybenzoate, bis-t-butylperoxyisophthalate, 2,5-dimethyl-2,5-bis (benzoylperoxy) hexane, t-butylperoxy Examples include 2-ethylhexanoate and t-butyl peroxyisopropyl carbonate. Specific examples of dialkyl peroxides include dicumyl peroxide, di-t-butyl peroxide, and lauroyl peroxide. Specific examples of peroxyketals include 1,1-bis (t-butylperoxy) -3,3,5-trimethylcyclohexane. Specific examples of ketone peroxides include methyl ethyl ketone peroxide, cyclohexanone peroxide, methyl acetoacetate peroxide, and the like. Specific examples of the hydroperoxides include t-butyl hydroperoxide, cumene hydroperoxide, and p-diisopropylbenzene peroxide.

  Aromatic tertiary amines include N, N-dimethylaniline, N, N-dimethyl-p-toluidine, N, N-dimethyl-m-toluidine, N, N-diethyl-p-toluidine, N, N- Dimethyl-3,5-dimethylaniline, N, N-dimethyl-3,4-dimethylaniline, N, N-dimethyl-4-ethylaniline, N, N-dimethyl-4-i-propylaniline, N, N- Dimethyl-4-t-butylaniline, N, N-dimethyl-3,5-di-t-butylaniline, N, N-bis (2-hydroxyethyl) -3,5-dimethylaniline, N, N-bis (2-hydroxyethyl) -p-toluidine, N, N-bis (2-hydroxyethyl) -3,4-dimethylaniline, N, N-bis (2-hydroxyethyl) -4-ethylaniline, N, N − (2-hydroxyethyl) -4-i-propylaniline, N, N-bis (2-hydroxyethyl) -4-t-butylaniline, N, N-bis (2-hydroxyethyl) -3,5- Di-i-propylaniline, N, N-bis (2-hydroxyethyl) -3,5-di-t-butylaniline, ethyl 4-N, N-dimethylaminobenzoate, 4-N, N-dimethylamino Examples include methyl benzoate, 4-N, N-dimethylaminobenzoic acid n-butoxyethyl, 4-N, N-dimethylaminobenzoic acid 2- (methacryloyloxy) ethyl, and 4-N, N-dimethylaminobenzophenone. .

  Aliphatic tertiary amines include trimethylamine, triethylamine, N-methyldiethanolamine, N-ethyldiethanolamine, Nn-butyldiethanolamine, N-lauryldiethanolamine, triethanolamine, 2- (dimethylamino) ethyl methacrylate, N- Examples include methyl diethanolamine dimethacrylate, N-ethyldiethanolamine dimethacrylate, triethanolamine monomethacrylate, triethanolamine dimethacrylate, and triethanolamine trimethacrylate.

  As sulfinic acid or a salt thereof, benzenesulfinic acid, sodium benzenesulfinate, potassium benzenesulfinate, calcium benzenesulfinate, lithium benzenesulfinate, toluenesulfinic acid, sodium toluenesulfinate, potassium toluenesulfinate, calcium toluenesulfinate , Lithium toluenesulfinate, 2,4,6-trimethylbenzenesulfinic acid, sodium 2,4,6-trimethylbenzenesulfinate, potassium 2,4,6-trimethylbenzenesulfinate, 2,4,6-trimethylbenzenesulfine Calcium oxide, lithium 2,4,6-trimethylbenzenesulfinate, 2,4,6-triethylbenzenesulfinate, 2,4,6-triethylbenzenesulfinate Thorium, potassium 2,4,6-triethylbenzenesulfinate, calcium 2,4,6-triethylbenzenesulfinate, 2,4,6-isopropylbenzenesulfinate, sodium 2,4,6-triisopropylbenzenesulfinate, Examples include potassium 2,4,6-triisopropylbenzenesulfinate and calcium 2,4,6-triisopropylbenzenesulfinate.

  Examples of aldehydes include dimethylaminobenzaldehyde and terephthalaldehyde.

  Examples of the compound having a thiol group include 2-mercaptobenzoxazole, decanethiol, 3-mercaptopropyltrimethoxysilane, and thiobenzoic acid.

  A hardening | curing agent may mix | blend 1 type individually, and may mix | blend multiple types in combination. The blending amount is preferably in the range of 0.01 to 10% by weight, more preferably in the range of 0.05 to 7% by weight, most preferably in the range of 0.1 to 5% by weight, based on the total weight of the adhesive. preferable.

  In order to improve adhesiveness, applicability, fluidity, radiopacity or mechanical strength, a filler may be blended. Examples of the filler include inorganic fillers, organic fillers, and composite fillers of inorganic fillers and organic fillers.

As the inorganic filler, silica; minerals based on silica such as kaolin, clay, mica, mica; silica based, Al ₂ O ₃ , B ₂ O ₃ , TiO ₂ , ZrO ₂ , BaO, La Examples thereof include ceramics and glasses containing ₂ O ₃ , SrO ₂ , CaO, P ₂ O _{5 and the} like. As the glass, lanthanum glass, barium glass, strontium glass, soda glass, lithium borosilicate glass, zinc glass, fluoroaluminosilicate glass, borosilicate glass, and bioglass are preferable. Other than these, crystalline quartz, hydroxyapatite, alumina, titanium oxide, yttrium oxide, zirconia, calcium phosphate, barium sulfate, aluminum hydroxide, sodium fluoride, potassium fluoride, sodium monofluorophosphate, lithium fluoride, ytterbium fluoride Is also preferable.

  Examples of the organic filler include polymethyl methacrylate, polyethyl methacrylate, polyfunctional methacrylate polymer, polyamide, polystyrene, polyvinyl chloride, chloroprene rubber, nitrile rubber, and styrene-butadiene rubber.

  Examples of the composite filler of an inorganic filler and an organic filler include those obtained by dispersing an inorganic filler in an organic filler and those obtained by coating an inorganic filler with various polymerizable monomers.

  In order to improve curability, mechanical strength, applicability, etc., the filler may be used after surface treatment with a surface treatment agent such as a silane coupling agent. As the surface treating agent, vinyltrimethoxysilane, vinyltriethoxysilane, vinyltrichlorosilane, vinyltri (β-methoxyethoxy) silane, γ-methacryloyloxypropyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ- Examples are mercaptopropyltrimethoxysilane and γ-aminopropyltriethoxysilane.

  One type of filler may be blended, or a plurality of types may be blended in combination. The blending amount is preferably in the range of 0.1 to 80% by weight, more preferably in the range of 0.5 to 50% by weight, and most preferably in the range of 1 to 20% by weight, based on the total weight of the adhesive. When the blending amount exceeds 80% by weight, the adhesion to columnless enamel may be lowered.

  A specific component (calcium in the apatite) exposed to the surface layer of the columnar enamel by the decalcification action of the sulfonic acid group-containing polymerizable monomer (a), and a salt (b) of the acidic group-containing polymerizable monomer In order to give higher acid resistance to the adhesive layer having high acid resistance produced by the reaction, a fluorine ion releasing substance may be blended. Fluorine ion-releasing substances include fluorine glasses such as fluoroaluminosilicate glass; metal fluorides such as sodium fluoride, potassium fluoride, sodium monofluorophosphate, lithium fluoride, and ytterbium fluoride; methyl methacrylate and methacryl Fluorine ion releasing polymers such as copolymers with acid fluoride; fluorine ion releasing substances such as cetylamine hydrofluoride are exemplified.

  You may mix | blend a stabilizer (polymerization inhibitor), a coloring agent, a fluorescent agent, and an ultraviolet absorber. For the purpose of imparting antibacterial properties, cetylpyridinium chloride, benzalkonium chloride, (meth) acryloyloxidedecylpyridinium bromide, (meth) acryloyloxyhexadecylpyridinium chloride, (meth) acryloyloxydecylammonium chloride, triclosan, etc. You may mix | blend an antibacterial substance.

  The two-component adhesive according to the present invention does not cause significant damage to the tooth structure, particularly when all or most of the treatment target is columnar enamel. Therefore, it is particularly suitable as an adhesive used for fixing the bracket to the pillarless enamel in orthodontic treatment. When the two-component adhesive according to the present invention is used for this purpose, the bracket (attachment) can be easily removed because the adhesive layer (resin layer) can be easily destroyed by a remover, scaler, etc. after the treatment is completed. It is.

  In addition, as a pretreatment agent used when adhering dental nail polish material for esthetic restoration, coating material for preventing dental caries applied to the tooth surface adjacent part, or pit and fissure filling material to pillarless enamel Is also suitable. Furthermore, the two-component adhesive according to the present invention can be used as a tooth nail polish material or a coating material.

  Next, the bonding method according to the present invention will be described. In the bonding method according to the present invention, the two-component adhesive according to the present invention is used. One example will be described below. First, immediately before use, the first liquid and the second liquid are mixed to form one liquid. Incidentally, the adhesive strength of the two-component adhesive according to the present invention hardly decreases for at least 5 minutes after mixing. Apply a one-component adhesive to the surface of the toothless enamel of a tooth using a sponge or brush, and leave it in that state for a period of less than 120 seconds, or use a one-component adhesive as a sponge or brush. Let it soak into the surface of the pillarless enamel for a period of 60 seconds or less. Thereafter, if necessary, air blow is performed with a dental air syringe. Next, a dental restorative material such as composite resin, cement, dental nail polish, pit and fissure sealant is laminated on the adhesive layer, and the dental restorative material and the adhesive layer are cured simultaneously. The adhesive layer hardens in a state where it reacts with a specific component (calcium in apatite) of the columnar enamel exposed on the surface layer of the columnar enamel due to decalcification. However, when the adhesive contains a curing agent (photopolymerization initiator) that generates radicals by light irradiation, a dental visible light irradiator is used on the adhesive layer before laminating the dental restorative material. It is preferable to irradiate the light and harden it separately from the dental restorative material because better adhesiveness can be obtained.

  The invention is explained in more detail by means of examples. The present invention is not limited to the following examples. Examples 1 to 14 are examples of the two-component adhesive according to the present invention and are also examples of the bonding method according to the present invention. Comparative Examples 1-7 are comparative examples for the two-component adhesive according to the present invention, and Comparative Examples 8-12 are comparative examples for the bonding method according to the present invention. Abbreviations used below are as follows.

(Sulphonic acid group-containing polymerizable monomer)
AMPS: 2-acrylamido-2-methylpropanesulfonic acid (sulfonic acid group-containing polymerizable monomer (a))
MAPS: 2-methacrylamide-propanesulfonic acid (sulfonic acid group-containing polymerizable monomer (a))
MOPS: 3-methacryloyloxypropylsulfonic acid

[Salt of acidic group-containing polymerizable monomer (b)]
MDP-Na: salt of an acidic group-containing polymerizable monomer represented by the following chemical formula 7

  MDP-2Na: salt of an acidic group-containing polymerizable monomer represented by the following chemical formula 8

  MHP-Li: salt of an acidic group-containing polymerizable monomer represented by the following chemical formula 9

  MDP-T: salt of an acidic group-containing polymerizable monomer represented by the following chemical formula 10

  MET-Ca: salt of an acidic group-containing polymerizable monomer represented by the following chemical formula 11

[Water-soluble polymerizable monomer (d-2)]
HEMA: 2-hydroxyethyl methacrylate 9G: nonaethylene glycol dimethacrylate

(Hydrophobic polymerizable monomer)
UDMA: [2,2,4-trimethylhexamethylenebis (2-carbamoyloxyethyl)] dimethacrylate 3G: triethylene glycol dimethacrylate MMA: methyl methacrylate MTS: 2-methacryloyloxyethyl-3′-methacrylolyloxy- 2 '-(3,4-Dicarboxylbenzoyloxy) propyl succinate

[Curing agent]
CQ: camphorquinone TMDPO: 2,4,6-trimethylbenzoyldiphenylphosphine oxide DEPT: N, N-bis (2-hydroxyethyl) -p-toluidine DAAE: ethyl 4-N, N-dimethylaminobenzoate

[Others]
PMMA: polymethyl methacrylate BHT: 2,6-di-t-butyl-4-methylphenol (stabilizer (polymerization inhibitor))

(Example 1)
AMPS (20 parts by weight), distilled water (30 parts by weight), ethanol (50 parts by weight), and BHT (0.1 parts by weight) were mixed to prepare a first liquid. Moreover, MDP-Na (25 weight part) and ethanol (75 weight part) were mixed and the 2nd liquid was prepared. Next, the first liquid and the second liquid were weighed at a weight ratio of 1: 1 to prepare a two-component adhesive according to the present invention. Note that the two-part adhesives of the following examples and comparative examples were all prepared by weighing the first and second liquids at a weight ratio of 1: 1. A test piece was prepared using the above-described two-component adhesive, and the following adhesion test A1, storage stability test B1, and gloss test C1 were performed on the test piece. Table 1 shows the number of adhesion steps, the presence / absence of use of a phosphoric acid etching agent, the compositions of the first liquid and the second liquid used, and the results of each test. The numerical values of the tensile adhesive strength (unit: MPa) in Table 1 are all average values of the measured values for the eight test pieces. The numerical value of the number of bonding steps is that the phosphoric acid etching process and the adhesive coating process are each counted as one step, the case where only one of them is performed is the bonding step number 1, and the case where both are performed is the number of bonding steps. The numerical value shown as 2. The numerical values of the tensile bond strength and the number of bonding steps in Tables 2 to 6 are the same.

(Examples 2 and 3 and Comparative Example 1)
A two-component adhesive (Examples 2 and 3) according to the present invention and a two-component adhesive for comparison (Comparative Example 1) were prepared, and test pieces were prepared using these adhesives. Each test piece was subjected to the following adhesion test A1, storage stability test B1, and gloss test C1. Table 1 shows the number of adhesion steps, the presence / absence of phosphoric acid etchant used, each composition (parts by weight) of the first and second liquids used, and the results of each test.

<Adhesion test A1>
The first and second liquids of the two-component adhesive were mixed to make one liquid. After removing the surface of the extracted human labial front teeth (columnar enamel) using a tooth surface cleaning brush (trade name “Brush Cone”, manufactured by Nippon Dental Industry Co., Ltd.) An adhesive tape having a thickness of 150 μm having a 3 mm round hole was attached, and the adhesive as the one liquid was applied in the round hole. After standing for 10 seconds, the volatile components were evaporated with a dental air syringe until the applied adhesive lost its fluidity. Next, a straightening composite resin (Kuraray Medical Co., Ltd., trade name “Clasper F, Paste”) is laminated on the adhesive-coated surface, and then coated with a release film (Kuraray Co., Ltd., trade name “EVAL”). The slide glass is placed and pressed, and in this state, light is irradiated for 20 seconds with a dental light irradiator (trade name “JETLITE 3000” manufactured by Morita) to cure the adhesive and the correcting composite resin. It was. On this hardened surface, one end face (circular cross section) of a stainless steel cylindrical rod having a diameter of 5 mm and a length of 1.5 cm was used with a chemical polymerization type dental bonding material (trade name “Poseren Bond” manufactured by Kuraray Medical Co., Ltd.). And bonded to form a test piece. Sixteen test pieces were produced. Of the 16 test pieces, 8 test pieces were bonded and stored for 10 minutes in a 37 ° C incubator (hereinafter referred to as “tensile bond strength 10 minutes after bonding”). The strength was measured with a universal testing machine (model number “MODEL1175” manufactured by Instron) with a crosshead speed set to 2 mm / min, and the initial adhesiveness was examined. The remaining 8 test pieces were immersed in 37 ° C water for 1 day, and then alternately immersed in 4 ° C cold water (distilled water) and 60 ° C hot water (distilled water) for 1 minute each. The tensile adhesive strength of the test piece after 2500 thermal cycles was measured in the same manner as described above to examine the adhesion durability. Tensile bond strength is obtained by pulling a stainless steel cylindrical rod in a direction that does not deviate more than 5 ° with respect to the axial direction with several metal plates with a thickness of 0.5 mm attached and teeth fixed. Measured.

<Storage stability test B1>
The first liquid and the second liquid were stored in a thermostat set at 50 ° C. for 30 days. In the following description, the stored two-component adhesive may be referred to as a stored product in order to distinguish it from the two-component adhesive (non-storage product) used in the previous adhesion test A1. Next, the first liquid and the second liquid were mixed to form one liquid. A test piece was prepared using this one-component adhesive, and the previous adhesive test A1 was performed on the test piece. Tensile strength after bonding (initial adhesiveness) and after thermal cycle loading The tensile stability (adhesion durability) was measured to examine the storage stability.

<Glossiness test C1>
The first and second liquids of the two-component adhesive were mixed to make one liquid. The surface of the extracted human labial front teeth (columnar enamel) was cleaned using a tooth surface cleaning brush (the above-mentioned “brush cone”), and then the adhesive as the above-mentioned one liquid was applied. After standing for 10 seconds, the volatile components were evaporated with a dental air syringe until the applied adhesive lost its fluidity. Next, a straightening composite resin (the above-mentioned “Clasper F, Paste”) is applied to a rectangular (4 mm × 3 mm) metal bracket (Tomy Co., Ltd., trade name “Edgewise Bracket, 131-13”), The coated surface was pressed against the above-described columnar enamel adhesive coated surface. After the pressure welding, the excess correction composite resin that protruded from the periphery of the bracket was removed with an instrument. Next, the dental outlet is arranged at a distance of 5 mm or less from the distal side or the mesial side of the bracket, and the orientation of the irradiation port is adjusted so that the irradiation light is incident on the tooth surface at an incident angle of 45 degrees. After irradiating light from the distal side and the mesial side of the bracket for 20 seconds with the light irradiator (above "JETLITE 3000"), the bracket is fixed to the labial front tooth, and then the tooth surface around the bracket is soaked with ethanol. The test piece was cleaned by rubbing lightly with a dipped cotton. The test piece was subjected to 2500 cycles of immersion in cold water (distilled water) at 4 ° C and warm water (distilled water) at 60 ° C for 1 minute each, and then the bracket was removed using a bracket remover. The presence or absence of the gloss of the attached part and its peripheral part was examined visually.

  As shown in Table 1, AMPS (sulfonic acid group-containing polymerizable monomer (a)), distilled water (water (c)), ethanol or acetone (water-soluble volatile organic solvent (d-1)) A first liquid containing MDP-Na, MDP-T or MET-Ca (salt of acidic group-containing polymerizable monomer (b)), ethanol or acetone (water-soluble volatile organic solvent (d- The two-component adhesives of Examples 1 to 3 comprising the second liquid containing 1)) are tensile bonded after 10 minutes after bonding and after thermal cycle loading, regardless of whether they are non-storage products or stored products. The strengths were all 10 MPa or more. Further, the gloss after the treatment of the bracket-enameled bracket mounting portion and its peripheral portion, that is, after the bracket was removed, was not so lowered as compared with that before the treatment. From these facts, the two-component adhesives of Examples 1 to 3 exhibit excellent adhesion to pillarless enamel, have excellent storage stability, and lose their luster on teeth. It can be seen that it does not cause significant damage.

  On the other hand, the two-component adhesive of Example 1 except that AMPS (sulfonic acid group-containing polymerizable monomer (a)) was not added to the first liquid and distilled water was increased by that amount. Although the gloss of the two-component adhesive of Comparative Example 1 having the same composition as that of the comparative example 1 did not decrease so much after the treatment, the tensile adhesive strength after 10 minutes after adhesion of the non-storage product and the storage product and after the heat cycle load was , Both were 5MP or less. From this, it can be seen that the sulfonic acid group-containing polymerizable monomer (a) greatly contributes to the excellent adhesive force exhibited by the two-component adhesive according to the present invention.

(Examples 4-7 and Comparative Examples 2-4)
A two-component adhesive (Examples 4 to 7) according to the present invention and a two-component adhesive for comparison (Comparative Examples 2 to 4) were prepared, and test pieces were prepared using these adhesives. The adhesive test A1, the storage stability test B1, and the gloss test C1 were performed on each test piece. Table 2 shows the number of adhesion steps, the presence / absence of use of a phosphoric acid etching agent, each composition (parts by weight) of the first and second liquids used, and the results of each test. Further, using the two-component adhesive of Example 4, Example 7, Comparative Example 2 or Comparative Example 3 as a pretreatment agent, the columnar enamel and the pit and fissure filling material were adhered, and the following adhesion was performed. Test A2, storage stability test B2, and acid-resistant layer formation test were conducted. The following pit and fissure filling material was used as the pit and fissure filling material. Table 3 shows the number of adhesion steps, the presence or absence of phosphoric acid etching agent used, the first and second liquids used, the pit and fissure filling material used, and the results of each test.

Fovea fissure filling material (1):
UDMA (62 parts by weight), 3G (29 parts by weight), CQ (0.5 parts by weight), TMDPO (1 part by weight), DAAE (1.5 parts by weight), fine particle silica powder (Nippon Aerosil) A product manufactured by K.K., trade name “Aerosil R972”) (5 parts by weight) and sodium fluoride (1 part by weight).

Fovea fissure filling material (2):
A composition prepared by kneading PMMA (65 parts by weight), MMA (30 parts by weight), CQ (1 part by weight), DAAE (1 part by weight), and sodium fluoride (3 parts by weight).

<Adhesion test A2>
Tensile bond strength 10 minutes after bonding (initial stage) in the same manner as in Adhesion Test A1 except that the above-mentioned pit / fissure cuff filling material (1) or (2) was used in place of the correction composite resin ) And tensile adhesive strength (adhesion durability) after thermal cycle loading were measured to examine the adhesion.

<Storage stability test B2>
Tensile bond strength 10 minutes after bonding in the same manner as in the previous storage stability test B1 except that the above-mentioned fovea fissure filling material (1) or (2) was used in place of the correcting composite resin. The initial adhesiveness) and the tensile adhesive strength (adhesive durability) after thermal cycle loading were measured to examine the storage stability.

<Acid resistance layer formation test>
The first and second liquids of the two-component adhesive were mixed to make one liquid. After removing the surface of the human fissured mandibular premolars (columnar enamel) with a tooth surface cleaning brush (“Brush Cone” above) It applied as a processing agent. After standing for 10 seconds, the volatile components were evaporated with a dental air syringe until the applied pretreatment agent lost its fluidity. Next, on the pretreatment agent application surface, the above-mentioned fovea fissure filling material (1) or (2) is laminated, and irradiated with light for 20 seconds with a dental light irradiator (above "JETLITE 3000"), The pretreatment agent and the pit and fissure filling material (1) or (2) were cured to obtain a test piece. This test piece was immersed in a phosphate buffer having a pH of 7.0, and stored in a 37 ° C incubator for 3 months in this state. After 3 months, the test piece was cut using a low-speed diamond saw, and the cut surface was polished with # 1500 silicon carbide paper (manufactured by Nihon Kenshi Co., Ltd.) under wet conditions, followed by further polishing of 1 μm diamond. Polished with paste. After polishing, the test piece was immersed in distilled water, subjected to ultrasonic cleaning to remove the diamond polishing paste adhering to the test piece, and then immersed in a citrate buffer solution at pH 5.6 for 8 hours. The test piece was taken out, and the adhesion interface between the tooth structure and the pit and fissure filling material in the fractured section was observed with an electron microscope (magnification: 2000 times) to examine whether or not an acid-resistant layer was formed.

  As shown in Table 2, AMPS (sulfonic acid group-containing polymerizable monomer (a)), distilled water (water (c)), ethanol and / or acetone (water-soluble volatile organic solvent (d-1) )), MDP-Na, MHP-Li or MDP-T (salt of acidic group-containing polymerizable monomer (b)), HEMA and / or 9G (water-soluble polymerizable monomer) The two-component adhesives of Examples 4 to 7 consisting of the second liquid containing the monomer (d-2)) are 10 minutes after bonding and thermal cycle regardless of whether they are non-storage products or storage products. The tensile adhesive strength after loading was 12 MPa or more. Further, the gloss after the treatment of the pillar-mounted enamel bracket mounting portion and its peripheral portion was not so much lower than that before the treatment. From these facts, the two-component adhesives of Examples 4 to 7 exhibit excellent adhesion to columnless enamel, excellent storage stability, and lose their luster on teeth. It can be seen that it does not cause significant damage.

  On the other hand, in the first liquid, AMPS (a sulfonic acid group-containing polymerizable monomer (a)) is not blended, and the two-component adhesive of Example 4 and Comparative Example 2 having the same composition are used. Same composition as the two-part adhesive of Example 4 except that the two-part adhesive and the second liquid do not contain MDP-Na (salt (b) of the acidic group-containing polymerizable monomer). The two-part adhesive of Example 7 except that MDP-Na (acid group-containing polymerizable monomer salt (b)) is not blended in the two-part adhesive of Comparative Example 3 and the second liquid The two-component adhesive of Comparative Example 4 having the same composition as that of the mold adhesive did not deteriorate so much in gloss after the treatment, but after 10 minutes after the non-storage product and the storage product were bonded and after the heat cycle load. The tensile adhesive strength was 4 MP or less in all cases. Therefore, in order to obtain excellent adhesion and adhesion durability, it is necessary to use the sulfonic acid group-containing polymerizable monomer (a) and the acid group-containing polymerizable monomer salt (b) in combination. I understand that there is.

  In addition, as shown in Table 3, the two-component adhesives of Examples 4 and 7 were not only excellent in adhesiveness, storage stability and gloss, but also formed a clear acid-resistant layer at the adhesive interface. On the other hand, the two-component adhesives of Comparative Examples 2 and 3 did not form an acid-resistant layer to the extent that it can be clearly recognized. Therefore, in order to form an adhesive layer having high acid resistance, it is necessary to use a sulfonic acid group-containing polymerizable monomer (a) and a salt (b) of the acidic group-containing polymerizable monomer in combination. I understand that there is.

(Examples 8 to 11 and Comparative Examples 5 to 7)
A two-component adhesive (Examples 8 to 11) according to the present invention, a two-component adhesive for comparison (Comparative Examples 5 and 6), and a one-component adhesive (Comparative Example 7) were prepared. . The one-pack type adhesive of Comparative Example 7 is prepared by mixing the first liquid and the second liquid of Example 8. Test pieces were prepared using each of these adhesives, and the adhesive test A1, the storage stability test B1, and the gloss test C1 were performed on each test piece. Table 4 shows the number of adhesion steps, the presence / absence of phosphoric acid etchant used, each composition (parts by weight) of the first and second liquids used, and the results of each test.

  As shown in Table 4, AMPS (sulfonic acid group-containing polymerizable monomer (a)), distilled water (water (c)), and ethanol (water-soluble volatile organic solvent (d-1)). From the 1st liquid to contain, the 2nd liquid which consists of MDP-2Na (salt (b) of an acidic group containing polymerizable monomer) and HEMA (water-soluble polymerizable monomer (d-2)) The two-component adhesives of Examples 8 to 11 had a tensile adhesive strength of 12 MPa or more after 10 minutes after bonding and after thermal cycle loading regardless of whether they were non-storage products or stored products. Further, the gloss after the treatment of the pillar-mounted enamel bracket mounting portion and its peripheral portion was not so much lower than that before the treatment. From these facts, the two-component adhesives of Examples 8 to 11 exhibit excellent adhesion to columnless enamel, excellent storage stability, and lose their luster on teeth. It can be seen that it does not cause significant damage.

  On the other hand, instead of AMPS (sulfonic acid group-containing polymerizable monomer (a)), MOPS (methacrylic acid ester-based sulfonic acid group-containing polymerizable monomer) is blended in the first liquid. Except for this, the two-component adhesive of Comparative Example 5 having the same composition as the two-component adhesive of Example 8 was replaced with MAPS (sulfonic acid group-containing polymerizable monomer (a)) in the first solution. The two-component adhesive of Comparative Example 6 and the one-component adhesive of Comparative Example 7, which have the same composition as the two-component adhesive of Example 11 except that MOPS is blended, Although the gloss did not decrease so much, the tensile adhesive strength after 10 minutes after adhesion of the stored product and after thermal cycle loading was 6 MP or less. In particular, the one-component adhesive of Comparative Example 7 had a tensile adhesive strength of 3 MP or less after 10 minutes after adhesion of the stored product and after thermal cycle loading. The reason why the storage stability of the two-part adhesives of Comparative Examples 5 and 6 is not good is that the MOPS blended as the sulfonic acid group-containing polymerizable monomer is chemically unstable and thus strongly acidic. This is because autolysis (mainly hydrolysis) is performed below. In addition, the storage stability of the one-part adhesive of Comparative Example 7 is very poor. Under the strong acidity exhibited by AMPS (sulfonic acid group-containing polymerizable monomer (a)) during storage, MDP- This is because 2Na (salt (b) of acidic group-containing polymerizable monomer) was hydrolyzed.

(Examples 12 to 14 and Comparative Examples 8 to 10)
Using the two-component adhesive of Example 1, 4 or 7 or Comparative Example 1 or 3 as a pretreatment agent, test pieces were prepared by applying dental nail polish to the surface of pillarless enamel, and these tests were performed. The pieces were subjected to the following adhesion test A3, storage stability test B3, and gloss test C2. The following dental nail polish was used as the dental nail polish. Table 5 shows the number of bonding steps, the presence or absence of use of a phosphoric acid etching agent, the two-component adhesive used, the dental nail polish used, and the results of each test.

Dental nail polish (1):
UDMA (21 parts by weight), 3G (9 parts by weight), barium glass (59 parts by weight) with an average particle size of 0.7 microns, and fine particle silica powder (product name “Aerosil R972” manufactured by Nippon Aerosil Co., Ltd.) ( 9 parts by weight), a silane-treated JP titanium oxide (1 part by weight), CQ (0.4 parts by weight), and DAAE (0.6 parts by weight).

Dental nail polish (2):
A composition prepared by kneading a commercially available photopolymerizable composite resin (manufactured by Kuraray Medical Co., Ltd., trade name “Clearfill Photo SC”) (99 parts by weight) with silane-treated JP titanium oxide (1 part by weight). Stuff.

Dental nail polish (3):
PMMA (65 parts by weight), MMA (32 parts by weight), silane-treated JP titanium oxide (1 part by weight), CQ (1 part by weight), and DAAE (1 part by weight) were kneaded. The prepared composition.

<Adhesion test A3>
Tensile bond strength 10 minutes after bonding in the same manner as in Adhesion Test A1 except that the dental nail polish (1), (2) or (3) was used instead of the orthodontic composite resin. The initial adhesiveness) and the tensile adhesive strength (adhesion durability) after thermal cycle loading were measured to examine the adhesiveness. However, in the bonding method according to the present invention of Examples 12 to 14 and the bonding method of Comparative Examples 8 and 9, a pretreatment agent was applied to the surface of the columnar enamel without performing phosphoric acid etching treatment, and Comparative Example In No. 10, the pretreatment agent was applied after phosphoric acid etching treatment was performed on the surface of the columnar enamel. In the phosphoric acid etching process in the adhesion method of Comparative Example 10, the surface of the extracted human lip-side front teeth (column-free enamel) was cleaned using a tooth surface cleaning brush (the above-mentioned “brush cone”). 35% phosphoric acid aqueous solution was applied, and after standing for 10 seconds, the decalcified no-column enamel component and phosphoric acid were washed away with running water. In addition, the pretreatment agent was applied to the surface of the lip side front teeth after decalcification treatment using dental air shilling, and then the adhesive tape was applied as a masking material to define the surface to be bonded. I went later.

<Storage stability test B3>
Tensile bond strength 10 minutes after bonding in the same manner as the storage stability test B1 except that the dental nail polish (1), (2) or (3) is used instead of the orthodontic composite resin. (Initial adhesiveness) and tensile adhesive strength (adhesion durability) after thermal cycle loading were measured to examine storage stability. However, as in the previous adhesion test A3, in the adhesion method according to the present invention in Examples 12 to 14 and the adhesion methods in Comparative Examples 8 and 9, the surface of the columnar enamel was not subjected to phosphoric acid etching treatment. A pretreatment agent was applied, and in the adhesion method of Comparative Example 10, the surface of the columnar enamel was subjected to phosphoric acid etching treatment, and then the pretreatment agent was applied.

<Glossiness test C2>
The first liquid and the second liquid of the two-component adhesive of Example 1, 4 or 7 or Comparative Example 1 or 3 were mixed to form one liquid. The surface of the extracted human labial front teeth (columnar enamel) was cleaned using a tooth surface cleaning brush (the above-mentioned “brush cone”). Next, in the bonding method according to the present invention of Examples 12 to 14 and the bonding method of Comparative Examples 8 and 9, the adhesive made into one liquid was applied to the surface of the labial front tooth without performing phosphoric acid etching treatment. It apply | coated as a processing agent, In the adhesion method of the comparative example 10, after performing the phosphoric acid etching process on the surface of said lip side front tooth, the adhesive agent made into 1 liquid was apply | coated as a pretreatment agent. After standing for 10 seconds, the volatile components were evaporated with a dental air syringe until the applied pretreatment agent lost its fluidity. Next, a 50 μm thick adhesive tape having a 4 mm diameter round hole is attached to the pretreatment agent application surface, and dental nail polish (1), (2) or (3) is laminated in the round hole, Is covered with a release film (trade name “EVAL”, manufactured by Kuraray Co., Ltd.), and then a slide glass is placed and pressed. In this state, the dental light irradiator (“JETLITE 3000” mentioned above) is used for 20 seconds. The adhesive and dental nail polish were cured by light irradiation. Next, the pressure-sensitive adhesive tape was peeled off, and the portion where the pressure-sensitive adhesive tape was adhered and its peripheral portion were cleaned by lightly rubbing with cotton soaked with ethanol to obtain a test piece. The test piece was subjected to 2500 cycles of immersion in cold water (distilled water) at 4 ° C and hot water (distilled water) at 60 ° C for 1 minute each, and then the dental nail polish was removed with a dental scaler. The portion from which the dental nail polish was removed and the presence or absence of gloss at the periphery thereof were examined visually.

  As shown in Table 5, according to the bonding method according to the present invention of Examples 12 to 14, it was possible to bond easily and without giving the tooth significant damage that would reduce its luster. On the other hand, in the bonding methods of Comparative Examples 8 and 9, excellent adhesiveness was not obtained. In addition, in the bonding method of Comparative Example 10, the bonding operation is complicated as much as the phosphoric acid etching treatment is performed, and due to excessive decalcification due to the phosphoric acid etching treatment, the tooth is damaged so much that its luster disappears. Gave.

(Comparative Example 11)
The surface of the extracted human labial front teeth (columnar enamel) was cleaned using a tooth surface cleaning brush (the above-mentioned “brush cone”), and then a 35% aqueous phosphoric acid solution was applied. After standing for 10 seconds, the decalcified columnar enamel component and phosphoric acid were washed away with running water, and the moisture on the surface of the labial front teeth was evaporated by dental air shilling. Next, after sticking adhesive tape as a masking material on the surface of the lip side front teeth after decalcification treatment, the surface to be bonded is defined, and then the orthodontic composite resin (“Clasper F, Paste”) is applied. The sample was irradiated with light for 10 seconds with a dental light irradiator (the above-mentioned “JETLITE 3000”), and was cured to obtain a test piece. About this test piece, the previous adhesiveness test A1, the storage stability test B1, and the glossiness test C1 were conducted. Table 6 shows the number of adhesion steps, the presence / absence of use of a phosphoric acid etchant, and the results of each test.

(Comparative Example 12)
The first and second liquids of the two-component adhesive prepared in Example 1 were mixed to form one liquid. The surface of the extracted human labial front teeth (columnar enamel) was cleaned using a tooth surface cleaning brush (the above-mentioned “brush cone”), and then a 35% aqueous phosphoric acid solution was applied. After standing for 10 seconds, the decalcified columnar enamel component and phosphoric acid were washed away with running water, and the moisture on the surface of the labial front teeth was evaporated by dental air shilling. Then, after sticking the adhesive tape as a masking material on the surface of the lip side front teeth after the decalcification treatment and defining the surface to be adhered, the adhesive as the above one liquid was applied, and allowed to stand for 10 seconds, Volatile components were evaporated with a dental air syringe until the fluidity of the applied adhesive disappeared. Laminate a composite resin for correction (the above-mentioned “Clasper F, paste”) on the adhesive-coated surface, and irradiate with a dental light irradiator (the above “JETLITE 3000”) for 10 seconds to correct the adhesive and the adhesive. The composite resin was cured and used as a test piece. About this test piece, the previous adhesiveness test A1, the storage stability test B1, and the glossiness test C1 were conducted. Table 6 shows the number of adhesion steps, the presence / absence of phosphoric acid etchant used, the two-component adhesive used, and the results of each test.

  As shown in Table 6, in the bonding method of Comparative Example 11 in which only the phosphoric acid etching treatment was performed, the bonding operation was simple, but excellent adhesiveness was not obtained, and excessive removal by the phosphoric acid etching treatment was not achieved. Due to the ash, the teeth were damaged so much that their luster disappeared. Even in the bonding method of Comparative Example 12 in which the adhesive was applied after the phosphoric acid etching treatment, the teeth were damaged so much that their luster disappeared due to excessive decalcification by the phosphoric acid etching treatment.

  The two-pack type adhesive according to the present invention is particularly useful as an adhesive having a columnar enamel as an adherend, but is used for restoration of a crown, such as metal, porcelain, ceramics, and composite hardened material, and dentin. Further, it can be used as an adhesive having an adherend other than a pillarless enamel such as cement.

Claims (6)

  A first liquid containing a sulfonic acid group-containing polymerizable monomer (a) having a methacrylamide group and / or an acrylamide group, and a second liquid containing a salt (b) of an acidic group-containing polymerizable monomer. A two-component non-column enamel adhesive comprising water and water (c) and water-soluble solvent (d) blended in the first liquid and / or the second liquid, respectively.   2. The two-component non-column enamel adhesive according to claim 1, wherein the salt (b) of the acidic group-containing polymerizable monomer is a phosphate.   3. The two-component no-column enamel adhesive according to claim 1 or 2, which is an adhesive for fixing a bracket for orthodontic treatment to the no-column enamel.   3. The two-component adhesive for columnar enamel according to claim 1 or 2, which is a pretreatment agent used when adhering the foveal fissure filling material to the columnar enamel.   The two-component adhesive for columnar enamel according to claim 1 or 2, which is a pretreatment agent used when applying dental nail polish to columnar enamel.   A bonding method for bonding a pillarless enamel and a dental restorative material using the two-component adhesive for a pillarless enamel according to any one of claims 1 to 5, wherein the first liquid And the second liquid are mixed to prepare a one-column no-column enamel adhesive, and the one-column no-column enamel adhesive is applied to the surface of the no-column enamel that has not been etched. A columnar enamel and a dental restorative material comprising: applying and forming an adhesive layer; laminating a dental restorative material on the adhesive layer; and curing the dental restorative material. Bonding method.