JPH04149110A - Stabilizer for artificial tooth - Google Patents

Abstract

PURPOSE:To obtain a stabilizer for artificial teeth, having cushioning properties, readily separable after use and readily exchangeable by using polyvinyl acetate as the base material and blending dimethylpolysiloxane therewith. CONSTITUTION:Polyvinyl acetate is used as the base material and dimethylpolysiloxane represented by the formula (R1 and R2 are CH3 or OH; (n) is average polymerization degree of dimethylsilane group and usually >=40) and showing viscosity of 500000-15000000 centipoise at 25 deg.C is blended therewith in an amount of 2-30wt.% based on the whole amount of the stabilizer. Innoxious fats and oils such as beeswax, a wax, a water insoluble powder, a wetting agent, a pigment, etc., are added thereto as necessary, thus obtaining the objective stabilizer for artificial teeth. As the polyvinyl acetate for the above- mentioned base material, one having 1000-2000 average polymerization degree and showing excellent cushioning properties in the vicinity of body temperature is especially preferable.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a denture stabilizer having cushioning properties and excellent releasability from a denture base.

BACKGROUND ART AND PROBLEMS In general, the suitability of complete dentures and partial dentures deteriorates as time passes from the time of adjustment or due to physiological changes in the oral cavity. As a result, the gap between the denture and the alveolar ridge becomes larger, causing problems such as looseness and reduced chewing ability. In order to improve such problems, it is fundamentally necessary for experts such as dentists to teach and operate, which requires a great deal of cost and time. Therefore, patients are unable to easily correct defects in their dentures, and often suffer from pain for quite a long time.

Denture stabilizers have been proposed as a way to easily improve such problems with dentures.

Hitherto, as this type of denture stabilizer, there have been known an adhesive type based on a water-soluble polymer and a cushion type based on polyvinyl acetate.

Although cushion-type denture stabilizers have excellent denture stability, they have poor peelability from the denture base after use, so it has been difficult to replace them with new ones after use.

In order to improve the above-mentioned problems, a denture stabilizer containing a polypropylene oxide polymer (Japanese Patent Application Laid-open No. 62-2
No. 65209) has been proposed, but the releasability was also insufficient.

Means for Solving the Problems The present invention provides a denture stabilizer that has cushioning properties and is easily peeled off from the denture base after use, unlike conventional denture stabilizers. The agent is
It is characterized by using polyvinyl acetate as a base material and blending dimethylpolysiloxane. That is, according to the present invention, by blending dimethylpolysiloxane with polyvinyl acetate, the denture stabilizer can be easily peeled off from the denture base.

The dimethylpolysiloxane to be used has the general formula % [wherein R3 and R7 are methyl groups or hydroxyl groups, n indicates the average number of dimethylsilane groups to be polymerized, and the number is 40 or more. This compound has a viscosity at 25°C of 100 centiboise (cps) to 15 million cps, preferably 100,000 to 10 million cps.

If it is less than 100 cps, the releasability from the denture base will be insufficient, and if it exceeds 15 million Cps, it will be difficult to mix the denture adhesive uniformly.

The ratio m of methylbory/loxane is 2 to 30% by weight, preferably 5 to 20% by weight based on the total amount of the denture adhesive.
shall be. If it is less than 2% by weight, the releasability from the denture base will be insufficient, and if it exceeds 30% by weight, the cost will increase.

Such dimethylpolysiloxanes are known and commercially available, such as those sold by Toray Silicone Co., Ltd. under the trade name Is H200 Oil-1. Further, in the present invention, in addition to using dimethylpolynoloxane having a predetermined viscosity alone, two or more types of dimethylpolysiloxane may be used in combination to obtain a predetermined viscosity.

Further, in the present invention, polyvinyl acetate is used as the base material in addition to the dimethylpolysiloxane, and preferably one having an average degree of polymerization of 10oO to 2000 exhibits excellent cushioning properties especially near body temperature.

The denture stabilizer of the present invention may contain other ingredients as necessary, such as non-toxic oils and waxes, emulsifiers, water-insoluble powders,
Wetting agents, water, ethanol, dyes, etc. can be blended. Non-toxic oils and waxes include beeswax, wood wax, cantelli wax, microcrystalline wax, paraffin wax, carnauba wax, etc.
Examples of emulsifiers include acetylated glyceryl fatty acid esters such as stearic acid monoglyceride, oleic acid monoglyceride, and acetylated glyceryl monostearate;
Examples include sorbitan monostearate. As the water-insoluble powder, calcium carbonate, calcium hydrogen phosphate, silica, hydroxyapatite, plastic balata, cellulose powder, etc. are used.

As the wetting agent, polyethylene glycol, propylene glycol, glycerin, sorbitol, etc. are used.

In addition, other organoporin loxanes other than dimethylpolynoroxane may be blended, such as, among others, safety to living organisms, colorless and transparent appearance suitable as a denture stabilizer,
Because of their ease of availability, methylhytron emporinoxane, methylphenylpolinosiloxane can be blended, and in addition, methylborinrooxane, alkyl-modified silicone,
Amino-modified silicone, epoxy/modified silicone 1) cone, carfoquin-modified IJ cone, chloroalkyl-modified silicone, alkyl higher alcohol ester 1. Silicone, alcohol-modified silicone, polyether-modified silicone, and fluorine-modified silicone can be used alone or in combination of two or more.

EXAMPLES Next, the present invention will be explained in more detail with reference to Examples and Reference Examples.

Examples 1 to 13 and Comparative Examples 1 to 4 Denture stabilizers were prepared according to the formulations shown in Table 1, and evaluated by the following method.

(1) Viscosity of dimethylboria xane An HBT viscometer manufactured by Brookfield was attached to a Helibus stand (Hel 1path S Land), and the viscosity was measured at a rotation speed of 5 rpm using a TF spindle. The measurements were performed in a constant temperature room at 25°C. This system can measure up to 16 million centipoise, but since the measurement accuracy is poor below 1% of the full scale viscosity (160,000 centipoise), we used a BL type viscometer manufactured by Tokyo Keiki Co., Ltd. , and the rotation speed was 6 rpm.

(2) An appropriate amount of denture stabilizer was attached to a removable methacrylic resin maxillary complete denture according to a conventional method, and the denture was immersed in 37°C water for 24 hours.

Thereafter, the denture stabilizer was peeled off from the denture using only the fingertips, and the ease of peeling was sensory evaluated using the following criteria.

◎: Easy ○, Somewhat easy △: Somewhat difficult
Since it has cushioning properties and is easily peeled off from the denture base, the denture stabilizer can be easily replaced, which improves the conventional problems.

Claims (1)

[Claims] (1) A denture stabilizer characterized by having polyvinyl acetate as a base material and containing dimethylpolysiloxane.