JP2011121924A - Dental model fabrication method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dental model fabrication method which can shorten the time of curing an impression material, a disinfection/sterilization step, and a long gypsum curing time for abridging working steps of fabricating a dental model and is simple and low-cost. <P>SOLUTION: For the purpose of achieving a low-cost dental model fabrication method, the method is characterized in that a material used in the dental model fabrication is mixed with alum water. Alum water cannot only accelerate the time of curing an impression material or gypsum but also can markedly abridge working steps in virtue of its sterilization action and astringent action. The subject of an impression material mixed with the alum water is an impression material composition based on mainly a soluble alginate and is generally effective dental gypsum. The alum water is a desirably an aqueous solution of 0.01-5 wt.% alum concentration. The concentration of the alum water is adjusted according to the type, i.e., characteristics, of an impression material or gypsum. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to a method for producing a dental dental model, and relates to the production of an efficient dental model in a short time by controlling the curing time of an impression material and gypsum.

  The dental model is intended for the production of orthodontic teeth and cast crowns, and orthodontic treatment. For example, if a tooth is lost due to tooth extraction, it is necessary to wear a denture to restore mastication function and aesthetics. It consists of the work process of making a dental model made of gypsum based on the obtained impression.

  This dental plaster model must imitate and reproduce the patient's gingiva part, the remaining tooth part extending from this gingival part, and the gingival part of the tooth missing part by extraction, etc. It is necessary to work in a short time. Based on this tooth-type plaster model, for example, a denture for prosthesis of a missing tooth portion of a patient is created. When creating a cast crown, etc., it is necessary to check the mating state with the tooth such as the cast crown, so the surrounding teeth that create the cast crown, etc. do not interfere with the work. In addition, only the prosthetic portion of the target tooth is divided and taken out from other teeth.

  In order to perform such work, conventionally, a dental model impressed with gypsum was formed by a dental mold made of impression material taken from the patient's oral cavity, and the dentition of this dental model was cut and drilled. Insert a pin and fix it, put it in a base mold filled with gypsum that has been kneaded with water in advance, and after the gypsum hardens, remove the mold to make a work model, An operation is performed in which a mold tooth block for forming is cut from the work model.

  However, to obtain an intraoral impression from a patient, to create a dental model with gypsum, and to create a work model for creating a prosthesis, use an impression material or gypsum dissolved in water as a paste. However, it takes a long time to cure the impression material and gypsum, and when it is from 2 hours to 24 hours, it takes 24 hours.

  In addition, since the impression material is applied directly to the oral cavity, it is necessary to sterilize and disinfect bacteria in the oral cavity attached to the impression after taking the impression, as well as hygiene management of the impression material itself.

  Conventional curing time for impression materials is based on the composition of the impression material. Depending on the characteristics of the impression material, there are types such as first set, normal set, and slow set. Knead for 40 seconds, put the kneaded impression material on the tray, flatten the surface, press in the mouth, hold for about 1 minute 30 seconds to 2 minutes, confirm hardening, then remove to give impression Take it. Since the curing time of the impression material depends on the composition of the impression material, control of the curing time has to rely on the selection of the impression material.

  As the impression material, a dental alginate composition is widely used. This dental alginate composition is usually provided as a powder mainly composed of an alginate, a gelation reaction material, a gelation modifier and a filler, and is hardened by kneading and mixing with water at the time of use. And two types of pastes, a main material paste and a curing material paste, which are cured by mixing and kneading these pastes during use. The curing time of the impression material is adjusted by a gelation adjusting material (see, for example, Patent Document 1).

  After the impression is taken, sterilization is performed, but since the disinfecting solution contains ingredients that affect the setting time of the plaster, the surface of the plaster is roughened when the dental model is made by pouring the plaster. And stability problems due to impression shrinkage. On the other hand, for example, in Patent Document 2, an impression adjusting material for disinfecting an impression obtained using an impression material and smoothing a surface of a plaster model obtained from the impression is presented. As the conditioner, one or more of a specific alcohol, a specific cationic surfactant, chlorhexidine, triclosan (Irgasan DP300), popidone iodine and glutaraldehyde is used as a disinfectant, and the solubility at 20 ° C. is 0.2. It is said that the effect can be obtained by using the above specific metal salt in combination as a fixing material.

  When producing a dental model, the work process that requires the most waiting time is a gypsum curing process. For this reason, a hardening accelerator is blended in gypsum. As the hardening accelerator, for example, there is a method of accelerating hardening or adding potassium sulfate by using slurry water obtained by scraping an existing gypsum model with a wet trimer to form an aqueous solution as a nucleus of the gypsum hydration reaction.

  Regarding the setting time of gypsum, Patent Document 2 discloses a method of adjusting the components of gypsum. After washing and drying the by-product α hemihydrate gypsum and adding inorganic alkali, β hemihydrate gypsum with a particle size of 0 to 425μ is added, and the mixing ratio is the total amount of gypsum Is a curing time adjusting method for by-product α hemihydrate gypsum, wherein β hemihydrate gypsum is 1 to 50 parts by weight. In addition, a mixture of the by-product α hemihydrate gypsum and β hemihydrate gypsum is mixed with one or more of fillers, lightweight aggregates, adhesion-imparting agents, viscosity modifiers, curing retarders, and fungicides. It is a presentation of gypsum.

  Further, Patent Document 3 discloses a method for improving the manufacturing process and shortening the curing time. Here, in the manufacture of dentures, the setting time of gypsum is reduced, and in particular, the setting time of gypsum during the patient's visit period is eliminated. In the jaw impression collection process, impression material is placed on one side of the dental tooth tray, the shape of the gingiva is transferred, and a jaw impression member is obtained, and in the wax ridge formation process, the other side of the dental tooth tray In the articulator mounting process, a dental dental tray holding the jaw impression member and the wax dyke is mounted on the articulator. And, in the artificial tooth planting step, with the dental tooth tray holding the jaw impression member and the wax dyke installed in the articulator, artificial teeth were sequentially implanted in the wax dyke, using the articulator, Sequential adjustment is performed so that the artificial teeth for the upper jaw and the artificial teeth for the lower jaw are properly bitten. This made it possible to produce dentures in a short period of time.

  Regarding the disinfection and sterilization of impressions, Patent Document 4 proposes an impression material adjustment liquid for disinfection including the effect of preventing roughening of the gypsum surface by components of the disinfecting liquid. The proposed impression material preparation liquid is a disinfectant containing at least one of a specific alcohol, a specific cationic surfactant, chlorhexidine, triclosan (Irgasan DP300), popidone iodine, and glutaraldehyde at 20 ° C. It is an impression adjusting material using a specific metal salt having a solubility of 0.2 or more as a fixing material.

In the production of a dental model, the dimensional accuracy is also an important factor, and in order to produce a denture suitable for a patient, an accuracy of 10 to several tens of microns is required, but the impression material is shrinkable, On the other hand, gypsum has expansibility. For this reason, the accuracy differs slightly depending on the material used, and dimensional adjustment after denture production is unavoidable. For this purpose, for example, Patent Document 5 proposes a gypsum composition for the purpose of adjusting the expansion coefficient of gypsum.

Japanese Patent Application Laid-Open No. 06-056620 Japanese Patent Laid-Open No. 10-316420 JP 2003-159261 A Japanese Unexamined Patent Publication No. 07-33620 Special table 2004-532062 gazette

  In the production of dental models, efficiency is desired by shortening the work process, but it is important to shorten the setting time of the impression material, the disinfection sterilization process and the setting time of gypsum which takes a long time. It becomes a point. Moreover, it is an important factor not to deteriorate workability and model accuracy.

  Conventionally, improvements mainly focused on the material composition have been made, but the curing time is also affected by the temperature, and adjustment according to the use environment is required. In addition, it may be necessary to adjust the working time based on the experience and skill of dentists and dental technicians, and the adjustment of the curing time according to the work purpose.

An object of the present invention is to provide a simple and inexpensive method for manufacturing a tooth model in order to cope with such a demand.

  In order to realize a simple and inexpensive method for producing a dental model, the present invention is characterized in that, for the above purpose, materials used in the production of a dental model are kneaded using alum water. Yes. Alum water not only accelerates the setting time of impression materials and gypsum, but can also greatly shorten the work process due to its sterilization and convergence effects. The sterilization action eliminates the disinfection process after taking the impression, and the astringent action alters the protein formed in the skin and jaws, creates a dense protective film and tightens the skin, making the impression smooth Surface formation also has a positive effect on the surface formation of gypsum.

  The object of the impression material kneaded with alum water is an impression material composition mainly composed of a soluble salt of an alginate, which is generally effective for dental plaster.

  The alum water has a suitable concentration of an aqueous solution containing 0.01 to 5 wt% of alum. The concentration of alum water is adjusted by the type of impression material or plaster, that is, the characteristics. For gypsum, a relatively low concentration may be used, and an aqueous solution of 0.3 to 0.6 wt% is preferable.

Alum water is made as an aqueous solution of baked alum and water. A stock solution near the saturation concentration of alum relative to water may be prepared, and diluted with water according to the material. The concentration is appropriately adjusted based on the relationship between the viscosity of the tooth model material after kneading and the curing time. Alum has a remarkable difference in solubility depending on the temperature, but it is about 4 wt% at room temperature and is stored as alum water stock solution at a concentration of 2 to 4 wt%. Baked alum is inexpensive and readily available as it is commercially available. Baked alum takes a long time to dissolve and is left to stand for 2-3 days, but it can be stored in alum water stock solution and its concentration can be freely adjusted to an appropriate concentration according to the material and purpose at the time of use. .

The present invention is a method for producing a dental model characterized by kneading an impression material and gypsum, which are materials used in the production of a dental model, using alum water, and promoting hardening time by alum water and In addition to controlling the setting time according to the alum concentration, the sterilization action and the convergence action of alum water make it possible to produce a tooth model with good workability and high accuracy in a short time.

The flowchart which shows the outline | summary of the dental model manufacturing method by this invention. Alum Solubility Flow chart of how to make alum water stock solution. Flow chart of taking an impression according to the present invention Flow chart of making a plaster dental model according to the present invention Example of tooth model produced

  First, materials used and characteristics of the method for manufacturing a tooth model of the present invention will be described.

  Impression material is a material for obtaining an impression in the oral cavity, agar impression material, alginate impression material with a soluble salt of alginate as a main component and potassium sulfate as a gelation reaction material, and silicon rubber with silicon rubber as a raw material Although there is an impression material, the impression material targeted in the present invention is an alginate impression material. The alginate impression material is composed of, for example, a composition component obtained by adding potassium sulfate as a gelation reaction material to sodium alginate and diatomaceous earth. In addition, there are also those in which potassium alginate is further added to adjust the curing time, and coloring materials for coloring, liquid paraffin, fragrance and the like are added.

  Dental gypsum is a trigonal hemihydrate gypsum that is calcium sulfate hemihydrate, and includes dental hard gypsum with α gypsum as the main raw material, and dental calcined gypsum with β gypsum as the main raw material. There is. Hemihydrate gypsum reacts with water to hydrate and turns into dihydrate gypsum and hardens. The setting of gypsum takes a long time and usually completes in about 30 minutes, but it takes about 2 hours to complete hydration.

  In order to accelerate the setting time of gypsum, 3 to 4% by weight of sodium chloride or sodium sulfate or potassium sulfate is added. There is also a method of promoting hardening by using a liquid obtained by partially cutting an existing gypsum model with a wet trimer, that is, slurry water, as a nucleus of the hydration reaction of gypsum.

  As described above, the present invention has been made by earnest research focusing on the gelation reaction of the impression material and the potassium sulfate used as a hardening accelerator for gypsum, and is produced from potassium sulfate and aluminum sulfate. A new feature is that it is kneaded with an alum solution.

A representative example of alum is potassium aluminum alum, or potassium aluminum sulfate, which is called potassium alum. It can be obtained by concentrating and cooling an acidic aqueous solution of potassium sulfate and aluminum sulfate. Alternatively, alunite KAl ₃ (SO ₄ ) 2 (OH) ₆ is pulverized, dissolved in sulfuric acid, and cooled. Colorless crystals that dissolve in water. When the potassium aluminum alum solid is gently heated at 160 ° C. or lower, an anhydrous salt is obtained, which is said to be baked alum or bonito. The main uses are pharmaceuticals (poultice, antiseptic), dyeing, food additives, water clarifiers and the like.

  A typical alum, potassium aluminum sulfate, promotes gelation of impression materials and hardening of gypsum. In addition, since alum water dissolved in water becomes acidic, bacteria cannot propagate in an acidic environment and has a sterilizing and disinfecting effect. Furthermore, it has a deodorizing effect by neutralizing ammonia, which is alkaline, because it is weakly acidic.

  Alum water also has a convergent effect. The stratum corneum of the outermost skin layer of the skin is a protein called ketinamine, and when alum acts, it has an astringent action that changes to hard and smooth keratinamine. For this reason, the barrier property which is one of the functions of the skin is enhanced, and the function of protecting the internal tissue from external stimuli is strengthened.

  By kneading the impression material or gypsum with alum water having such characteristics, the sterilization effect of the impression material and the hardening time of the gypsum can be mainly promoted. Even if the alum itself is a solid material, it can be used as an aqueous solution by being dissolved in water and used as an aqueous solution rather than being used as an additive for impression material or gypsum.

  Next, specific implementation will be described.

  FIG. 1 is a flowchart of a method for producing a tooth model showing an outline of the implementation of the present invention.

  First, a necessary amount of impression material used in step S1 is weighed. Next, in step S2, a necessary amount of alum water according to the present invention is added and kneaded. The concentration and amount of alum water to be added are determined by taking into account the experience of the operator, the temperature of the environment, etc. with respect to the mixing ratio of the standard recommended value of the impression material. The higher the concentration of alum water, the faster the gelation rate. If the amount of alum water is large, the viscosity of the impression material after kneading becomes low, and it becomes easier to flow along the tooth profile in the oral cavity. However, the gelation rate becomes slow. In this case, the gelation speed is increased by alum water, compared with the case where the same amount of normal water is added, so that an impression of an elaborate indirect model is obtained.

  The impression material kneaded with alum water is placed on the dental tray in step S3, and the impression material placed on the tray is pressed against the teeth and jaws in the oral cavity. Next, in step S4, after the impression material is properly gelled, the tray is removed from the oral cavity and washed with alum water. Alum water has bactericidal and astringent effects and is hygienic and safe for contact with the oral cavity. The astringent effect also resulted in a smooth impression surface. Due to the effect of this alum water, the sterilization process is simplified and the number of work steps can be greatly shortened. Since the impression material is kneaded with alum water, the impression material itself has a bactericidal effect, so that the bactericidal effect is maintained even by washing with water instead of alum water.

  Next, a required amount of gypsum is weighed in step S5, and kneaded with alum water in step S6. The concentration and amount of alum water in this case can be appropriately set by the operator depending on the characteristics of the gypsum used. That is, it can be arbitrarily set so as to accelerate the curing speed while increasing the concentration of alum water and lowering the viscosity after kneading to give the impression more faithful fluidity. Pour the plaster kneaded in Step 7 into the impression. Since the viscosity can be lowered due to the curing acceleration effect, a plaster model faithful to the impression that is an indirect model inside the oral cavity is possible. In step 8, the gypsum is removed from the impression after the gypsum is cured. Then, the tooth model is completed through step S9, which is a drying process.

  The setting of gypsum is slow and usually takes out after 30 to 60 minutes. The smaller the amount of water, the faster the curing time, and the higher the strength and smooth surface of the plaster model can be obtained. According to the present invention, these problems are solved, and a high-precision gypsum model can be completed in a short time.

  Next, details of a specific embodiment will be described.

(Example 1: Alum water stock solution)
First, preparation of alum water stock solution is described. The alum water stock solution is made to make alum water controlled to an arbitrary concentration corresponding to the dental model raw material.

  Alum is soluble in water, but solubility is highly temperature dependent. FIG. 2 shows the solubility of alum in water. Although it is 5.6 wt% at 20 ° C., it is 3.7 wt% at 10 ° C., and the solubility is 10.5 wt% at 40 ° C. Therefore, when considering room temperature storage, it is desirable to be around 3 wt%, and 2 to 4% is appropriate.

  FIG. 3 shows a flowchart of a method for preparing an alum water stock solution in consideration of the above points. Alum prepared Taisei Pharmaceutical "baked alum". In step S11, 30 g of baked alum is weighed. Next, 750 ml of water is weighed in step S12, and 30 g of alum is added to 750 ml of water placed in the container in step S13. Although the baked alum is water-soluble, it does not dissolve immediately and usually takes 2 to 3 days (step S14). Whether or not the baked alum is dissolved is determined based on whether or not the water clouded by the baked alum has become transparent (step S15). When the transparency is confirmed by visual observation, the alum water stock solution is completed (step S16). Alum stock solution having alum concentration of 3.8 wt%.

  This alum water stock solution is diluted according to the purpose and actual work is performed.

(Example 2: Taking an impression)
Acquisition of the impression which is an indirect intraoral model of a dental model will be described.

  Here, a slow set of a trade name “Aljoux Super” (manufactured by Edent Co., Ltd.), which is a dental alginate impression material, was used as an impression material. The composition components are potassium alginate, sodium alginate, diatomaceous earth, potassium sulfate, and liquid paraffin to which a coloring agent and a fragrance are added, and are cured by a gelation reaction between potassium sulfate and alginate.

  FIG. 4 shows a flowchart for taking an impression.

  First, 42 g of the impression material powder is weighed (step 21). Next, the alum stock solution prepared in Example 1 is diluted about 100 times to produce alum water having an alum concentration of 0.04 g (step 22). The amount of water mixed in the impression material is 33 ml of water with respect to 14 g of powder according to the manufacturer's recommended value, but the gelation time becomes 110 ml even if the viscosity after kneading is lowered. Mix for 30 seconds with a spatula (step 24). In the next step S25, the kneaded impression material is put on the dental tray, the surface is flattened, and then pressed into the oral cavity (step S26). Then, it waits for about 1 minute until the impression material hardens (step 27). The curing time at the mixed water ratio at the manufacturer's recommended value is about 1 minute 30 seconds to 2 minutes. However, according to the present invention, even when kneading has a low viscosity, the working time is shortened by promoting gelation. When solidified, the impression material is taken out from the oral cavity (step S28).

  The taken impression is washed with alum water (step S29). Here too, since the sterilizing effect of alum water can be used, a simple process may be used. Especially, the subsequent gypsum is kneaded with alum water. It is because it may be. Cleaning may be performed with water since the bactericidal action has already been exerted.

(Example 3: Gypsum model)
FIG. 5 shows a flowchart in the case of producing a plaster model from the obtained impression.

  The dental gypsum is hemihydrate gypsum, and here it is trade name “Judent ordinary gypsum” (manufactured by Judent Co., Ltd.). The composition component is calcium sulfate hemihydrate.

  First, in step S31, 150 g of alum water stock solution is added to 850 ml of water in order to dilute the alum water stock solution with water to obtain alum water having a solubility of 0.6 wt%. Next, the required amount of gypsum is weighed (step S32). Here, 200 g of gypsum was weighed. Then, 120 g of alum water diluted with gypsum is added to the container (step S33), and kneaded with a spatula for 30 to 60 seconds (step 34).

  After kneading, in step 35, pour plaster into the impression. The standard mixed water amount recommended by the manufacturer is 45 to 50 ml of water with respect to 100 g of gypsum powder. In the present invention, the mixed water ratio is larger than this. This is because the viscosity of the plaster poured into the impression is lowered to improve the fluidity and to produce a highly accurate plaster model. Even if it does in this way, hardening of gypsum is accelerated | stimulated by the effect by alum water use, and it can take out after waiting for about 10 to 20 minutes (step S36). The tooth model is completed at this stage (step 38). The complete curing time according to the manufacturer's recommended specifications is 40 to 60 minutes, and the curing time according to the present invention is a shortening effect of 50% or more.

  The setting time of gypsum is most desired to be shortened when manufacturing a dental model. In terms of dimensional accuracy, impression materials are generally shrink-hardened, and gypsum is expansion-hardened. The shortening of the curing time was also related to the production of a highly accurate tooth model, but according to the present invention, the alum concentration of alum water can be arbitrarily selected by diluting it from the alum water stock solution. And can be used in consideration of environmental temperature. Furthermore, since the impression is washed with alum water, even if the washed alum water remains in the impression, it acts as a hardening accelerator for gypsum, so that a smooth surface is obtained without roughening the gypsum surface. It is done. Furthermore, although depending on the nature of the gypsum, when the concentration of alum water is increased, a smooth surface can be obtained even if the water mixing ratio with gypsum is increased.

Although the present invention has been described above, the present invention includes appropriate modifications that do not impair the object and advantages thereof, and is not limited by the above embodiments.

10 Solubility of alum 20 Example of dental model after setting plaster (surface)
22 Example of dental model after setting plaster (back side)

Claims (10)

The materials used in tooth model production
Kneading with alum water,
A tooth model production method characterized by this.
In claim 1,
The tooth model material is an impression material composition mainly composed of a soluble salt of alginate for producing an indirect model inside the oral cavity,
A tooth model production method characterized by this.
In claim 2,
Washing an impression material, which is an impression material composition based on a soluble salt of alginate, which is an indirect model of the oral cavity, with alum water;
A tooth model production method characterized by this.
In claim 1,
The dental model material is dental plaster that transfers the dental impression,
A tooth model production method characterized by this.
In claim 1,
A dental mold manufacturing method, wherein the alum water is an aqueous solution containing 0.01 to 5 wt% of alum.
In claim 4,
The alum water kneaded with the gypsum is an aqueous solution of 0.3 to 0.6 wt% alum,
A tooth model production method characterized by this.
In claim 1,
Alum water must be an aqueous solution of baked alum and water,
A tooth model production method characterized by this.
In the range in any one of Claims 1-5,
Alum water is used by adding water to the stock solution in which alum is dissolved in relation to the characteristics of the dental model material.
A tooth model production method characterized by this.
In claim 6,
The relationship with the characteristics of the tooth model material is the relationship between the viscosity of the tooth model material after kneading and the setting time,
A tooth model production method characterized by this.
In claim 6,
The alum water stock solution must be alum water with a solubility of 2-4 wt%,
A tooth model production method characterized by this.

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