JP2007323051A - Soft reproduced tooth for dental arch model, and method of producing the same and application thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tooth to be used in a dental arch model which solves problems that since conventionally used dental arch models have cutting properties different from natural teeth, dental students having completed formation trainings such as anchor tooth formation and cavity preparation by using these conventional models are frequently puzzled to have different cutting and handling properties upon dental works in the oral cavity in practice, namely, these conventional dental arch models are largely different from natural teeth in cutting properties including the slipperiness and easiness in cutting. <P>SOLUTION: Disclosed is the tooth for the dental arch model to be used in practice treatments. The tooth is made of a ceramic baked body, whose gap portions are impregnated with wax and oil and fats. The tooth comprises dentin texture and enamel texture made of the ceramic baked body, gap portions of the ceramic baked body of the dentin texture being impregnated with wax or oil and fats and gap portions of the ceramic baked body being impregnated with a water-soluble material. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention is a tooth used for a jaw model in which a student aiming at a dentist experiences intraoral work and practice treatment. Specifically, the present invention relates to a method for manufacturing a tooth used for experiencing formation of abutments, formation of a cavity, and the like.

Teeth for a jaw and tooth model for intraoral treatment practice are often made of epoxy resin and melamine resin, and are widely used.
However, since epoxy resin and melamine resin have different cutting feelings, even when practicing abutment tooth formation and cavity formation, it is often embarrassed by the different cutting feeling and workability when working in the actual oral cavity. It was. Specifically, natural teeth tend to be hard to cut as expected, and the dentin part is harder, but the enamel part is harder, so the epoxy resin and melamine resin are softer and more cut. It tends to end up. As a result, there is a possibility that it will be sharply cut and the shape cannot be made well.

  As a result of a demand for a harder material, a composite type is commercially available. Even in composite type teeth, the dentin part and enamel part have the same cutting feeling, so the cutting feeling is different from natural teeth, and even if you practice abutment tooth formation and cavity formation, When working, it was often embarrassed by the different cutting feeling and workability. The easy-to-understand expression has a feeling of slipping, and the cutting feeling is very different from natural teeth.

In Japanese Utility Model Laid-Open No. 1-90068, Vickers hardness in which phlogopite crystal [NaMg3 (Si3AlO10) F2] and lithia / alumina / silica-based crystal (Li2O.Al2O3.2SiO2, Li2O.Al2O3.4SiO2) are simultaneously precipitated on the enamel layer. It is composed of glass and ceramics controlled to 350-450, and the root layer is added with white, red and yellow colorants in the polyol (main agent), and further mixed with an isocyanate prepolymer (curing agent) to form a silicone rubber base. The dentin recognition layer, which is injected into the mold under vacuum, hardened at room temperature and prepared in advance, is interposed between the enamel layer and the root layer, and is bonded together, has an opaque color. It is shown that it is formed with a sex resin.

  However, when the enamel layer is composed of phlogopite crystals or lithia / alumina / silica crystals, the cutting feeling is too hard compared to natural teeth, so it is not durable and the dentin recognition layer is adhesive. Since it was made of resin, the cutting feeling of the adhesive was too soft, so it was not durable.

Japanese Patent Application Laid-Open No. 5-224591 shows that a tooth model having cutting ability very similar to natural teeth and suitable for dental education cutting practice is provided. As main constituent components, inorganic powder and cross-linked resin are contained in a weight ratio of 20% to 80% to 70% to 30%.

As the inorganic powder constituting the tooth model of the present invention, for example, alumina, zirconia, titania, silica and the like are introduced, and the inorganic powder is not limited to the above compounds, and various inorganic powders can be used.
However, since the cutting feeling is different from that of natural teeth, even when practicing abutment tooth formation and cavity formation, when working in the actual oral cavity, it was often embarrassed by the different cutting feeling and workability. Moreover, only an inorganic powder body is disclosed. In particular, there has been a demand for a tooth having a stickiness peculiar to natural teeth, and it was not a tooth model that could show a difference in machinability between an enamel part and a dentin part.
Japanese Patent Laid-Open No. 5-216395 introduces the provision of a tooth model having a cutting ability very similar to that of natural teeth and suitable for dental education cutting practice and a method for manufacturing the same. Contains hydroxyapatite powder with a porosity of 40-80% and (meth) acrylic ester resin as a main component of the tooth model in a weight ratio of 20% to 80% to 50% to 50% It is what you are doing.
Conventional tooth models are not in a satisfactory state in terms of machinability. Therefore, although it has been shown that development of a tooth model similar to natural teeth in cutting ability is desired, it does not show a sufficient cutting feeling. In particular, there has been a demand for a tooth having a stickiness peculiar to natural teeth, and it was not a tooth model that could show a difference in machinability between an enamel part and a dentin part.

JP-A-5-224591 provides a dental model that can be optimally used for a periodontal disease treatment practice of a dentist. As a constitution, at least the surface of the crown portion has a Knoop hardness of 70 or more, and at least the surface of the root portion has a Knoop hardness of 10 to 40.
In the text, there is a description that “it may be made of a material of any hardness, for example, metal, ceramics, resin, and may be a cavity from the viewpoint of the preparation method of the tooth model and economical viewpoint”. It has not been solved from the viewpoint of cutting feeling. In particular, there has been a demand for a tooth having a stickiness peculiar to natural teeth, and it was not a tooth model that could show a difference in machinability between an enamel part and a dentin part.
In JP-A-5-241498, JP-A-5-241499, and JP-A-5-241500, there are descriptions of inorganic fillers and hydroxyapatite fillers. It has not yet been resolved. In particular, there has been a demand for a tooth having a stickiness peculiar to natural teeth, and it was not a tooth model that could show a difference in machinability between an enamel part and a dentin part.

Japanese Patent Application Laid-Open No. 2004-94049 describes an invention for providing a dental training model tooth that enables accurate shape measurement using a laser beam.
In the specification, “as the material constituting the crown surface of the model tooth of the present invention, generally known materials can be used, for example, ceramics or other porcelain or acrylic, polystyrene, polycarbonate, etc. , Acrylonitrile styrene butadiene copolymer (ABS), polypropylene, polyethylene, polyester, and other thermoplastic resin materials, melamine, urea, unsaturated polyester, phenol, epoxy, and other thermosetting resin materials, and their main raw materials Glass fiber, carbon fiber, pulp, synthetic resin fiber and other organic and inorganic reinforcing fibers, talc, silica, mica, calcium carbonate, barium sulfate, alumina and other fillers, pigments, dyes and other colorants, or What added various additives, such as a weathering agent and an antistatic agent, can be used. Is described with, but there is no description of the preferred material, it was not intended to resolve the grinding feel.

  In the development so far, the enamel part and dentin part of the tooth with the stickiness peculiar to natural teeth have not been developed, and it was not a tooth model that could show a difference in machinability. In particular, no method has been found to reproduce the softness of enamel and dentin. Furthermore, there is no disclosure as a specific composition for realizing this cutting feeling, and no description is given of a manufacturing method thereof. Although the jaw model has these problems, no research report has been found.

JP-A-5-241498 JP-A-5-241499, JP 5-241500 A JP 2004-94049 A Japanese Utility Model 1-90068

Although the conventional tooth for jaw model has a natural tooth form, it has a different cutting feeling. In order to experience the cutting feeling of natural teeth, some ideas such as cutting extracted teeth were seen. The extracted tooth is a material from the human body and animals, and there are problems with hygiene, infection may occur if hygiene is not adequately performed, and free practice has been hindered and sufficient infection prevention has to be performed. . Moreover, since it is a natural living body, there is a problem of spoilage, and sufficient caution is required for storage.
There has been a demand for a method for experiencing the cutting feeling of a tooth without using a natural tooth. In particular, there is a demand for a tooth having a stickiness peculiar to natural teeth, and there is a demand for a change in the cutting feeling of the dentin part from the enamel part of the tooth. Naturally, the enamel part has an enamel cutting feeling and a dentin part. Was demanded of a dentin-like cutting feeling, but no method was found to solve it.
As a result of research, it was necessary to use an inorganic calcined body in order to give a cutting feeling to natural teeth, and it was not possible to obtain a sufficient cutting feeling by itself. There has been a demand for a tooth having a stickiness unique to natural teeth.

A number of methods have been tried to express the sticky cutting feeling unique to natural teeth, but sufficient cutting feeling cannot be obtained with resin, composites, and the like. There has been a demand for a method of reducing cutting powder scattered in the folds of teeth.
When natural teeth are cut, a unique cutting feeling can be obtained when cutting a living body. In conventional denture model teeth, it appears prominently in the dentin layer, but the sensation that the organic components contained in the dentinal tubules of the tooth cling to the bar and the impediment to cutting are even while watering. I never got it. There is a demand for a cutting sensation that feels more viscous than the cutting sensation of inorganic materials because of the same phenomenon even in the case of enamel.

The present invention is a tooth for a jaw and tooth model for treatment practice, wherein the tooth is made of a ceramic fired body, and a void portion of the ceramic fired body is impregnated with wax or a water-soluble material. It is a tooth for a jaw and tooth model.
The present invention relates to a tooth for a jaw and tooth model for therapeutic practice, wherein the tooth is made of a ceramic fired body, and a void portion of the ceramic fired body is impregnated with a water-soluble material. This is a model tooth.
The present invention is a tooth for a jaw and tooth model for treatment practice, and in a tooth for a jaw and tooth model consisting of a dentin part and an enamel part, wherein the tooth is made of a ceramic fired body, A tooth for a jaw and tooth model, characterized by being impregnated with wax.

The present invention is a tooth for a jaw and tooth model for treatment practice, and in a tooth for a jaw and tooth model consisting of a dentin part and an enamel part, wherein the tooth is made of a ceramic fired body, A tooth for a jaw and tooth model, wherein at least one of the polysaccharides is impregnated.
The present invention is a tooth for a jaw and tooth model for treatment practice, and in a tooth for a jaw and tooth model consisting of a dentin part and an enamel part, wherein the tooth is made of a ceramic fired body, A tooth for a jaw and tooth model, which is impregnated with a protein system.

The present invention is a tooth for a jaw and tooth model for treatment practice, and in a tooth for a jaw and tooth model consisting of a dentin part and an enamel part, wherein the tooth is made of a ceramic fired body, A tooth for a jaw and tooth model, characterized by being impregnated with gelatin.
The present invention relates to a tooth for a jaw and tooth model for practice of treatment, wherein the dentin portion and the enamel portion are made of an inorganic powder fired body.
The present invention relates to a tooth for a jaw and tooth model for therapeutic practice, which comprises a dentin portion and an enamel portion, and after the dentin portion and the enamel portion are prepared, the dentine portion and the enamel portion are bonded to each other. This is a model tooth.
A tooth for a jaw and tooth model, wherein the adhesive of the present invention is an organic resin composition.

The present invention relates to a jaw and tooth model characterized by injection molding using CIM technology, forming a dentin portion and an enamel portion through degreasing and firing steps, and bonding the dentin portion and the enamel portion using an adhesive. This is a method for producing dental teeth.

According to the method of the present invention, both the dentin part and the enamel part can obtain the same cutting feeling as that of the natural tooth, and the cutting feeling that shifts from the enamel part to the dentin part is close to that of the natural tooth. Practice cutting natural teeth easily.
Since the extracted tooth is a material from a living body and has a hygiene problem, a tooth that can be used safely without taking measures such as infection prevention and has a feeling similar to that of the extracted tooth has been demanded. In addition, there is a need for a material that does not require any sanitary management and is free from the risk of corruption.

By forming an abutment tooth and a cavity using the tooth of the present invention, a cutting feeling similar to that of a natural tooth can be experienced quickly, and the formation experience can be easily performed. Moreover, these formation techniques can be acquired quickly.
The jaw model tooth is a substitute for the hardest natural tooth in the human body, and a normal material feels soft at the time of cutting, while a cutting feeling similar to that of a natural tooth can be obtained. A cutting experience similar to that of cutting using diamond abrasives (using an air turbine) rotating at a high speed of 400000 revolutions per minute in the oral cavity is possible.

According to the present invention, the dentin portion of the tooth for a jaw and tooth model can obtain a cutting feeling similar to that of a natural tooth. Although it was not possible to express a sufficient cutting feeling with the powder fired body alone, it could be expressed in the present invention.
Furthermore, the shape of the crown of the tooth model is also important, and it is important that the ridges, fossa, and cusps are accurately expressed as the objective of abutment tooth formation and cavity formation. ing. Since the tooth of the present invention can be white, ivory, milky white, and translucent, like a tooth, a more realistic cutting experience can be achieved. Preferred are white, ivory and milky white.
It has the effect of reducing dust scattered during tooth cutting, and it was possible to suppress dirt caused by dust from models and the like. Of course, we were able to reduce the inhalation of dust by the practicing students. There was a sticky cutting feeling like natural teeth, and it was possible to reproduce the sense of sticking to the diamond bar generated when cutting living teeth.

A tooth for a jaw and tooth model is a tooth used for simulating the practice of treatment in the oral cavity and practicing treatment using a jaw and tooth model in universities, etc., and the present invention cuts and forms teeth. It relates to the case used for In particular, the present invention relates to a tooth having cutting ability similar to that of a natural tooth and used for practicing cavity formation and abutment tooth formation.

The tooth composition of the present invention is preferably produced from ceramics. The composition of the tooth of the present invention is produced from ceramics or glass such as alumina, zirconia, silica, aluminum nitride, and silicon nitride. Moreover, it is preferable to produce by an alumina type and a zirconia type. Alumina-based and zirconia-based are that alumina or zirconia is 60% to 100%, preferably 80% to 100%, more preferably 95% to 100% of the fired body composition. In particular, the composition of alumina is 50% to 100%, preferably 70% to 100%, and more preferably 90% to 100%. The tooth composition is preferably molded from alumina powder.
To adjust the hardness of the enamel part and dentin part, there are methods such as roughening the grain size, increasing the voids, changing the material, changing the firing temperature, changing the mooring time, etc., but the most suitable method Is to change the particle size with the same composition.
The average particle size of the enamel portion is preferably 10 times or more than the average particle size of the dentin portion. When the average particle size of the enamel portion is 0.1 to 0.5 μm, the average particle size of the dentin portion is preferably set to 1.0 to 10.0 μm.
Although the firing temperature varies depending on the composition, when there are many glass components such as silica, the firing temperature is 800 to 1200 ° C., and when alumina is 1200 to 1600 ° C., preferably 1400 to 1550 ° C.

For forming the enamel part and the dentin part, it is preferable to use the CIM technique as a ceramic forming method.
Using CIM technology, the enamel part and the dentin part are injection-molded, and after degreasing and firing processes, the fired enamel part and the dentin part are bonded to the interface using a thermosetting resin or a chemically polymerizable resin. It is also preferable.

The present invention is characterized by impregnating a space portion in a ceramic fired body of a tooth for a jaw and tooth model with a water-soluble material or a heat-soluble material. The water-soluble material needs to be impregnated in the space portion, but any water-soluble polymer can be used without particular attention.
The water-soluble material to be impregnated in the space portion of the present invention is preferably at least one of polysaccharide and protein. The water-soluble material can exert its effect by pre-impregnation with water injection or water. Protein is preferred.
As the heat-soluble material to be impregnated in the space portion of the present invention, a wax system can be used. The effect can be exerted by frictional heat generated when cutting a heat-soluble material.

As the polysaccharide, dextrin, glycogen, cellulose, pectin, konjac mannan, glucomannan and alginic acid are preferable. Preferred are cellulose, pectin, konjac mannan and glucomannan. This is because a certain degree of viscosity is necessary.
The protein system may be a high molecular compound mainly composed of a polypeptide composed of about 20 kinds of L-α-amino acids. From the viewpoint of composition, it is preferable to use a simple protein consisting only of amino acids and a complex protein containing nucleic acid, phosphate, lipid, sugar, metal and the like. More preferred are gelatin, agar, collagen and elastin. Still more preferred are gelatin and agar. This is because it is necessary not to dissolve more and more in water but to maintain the shape in the voids of the fired body.

As a wax system, even if water is not used, the same effect as that of polysaccharides and proteins is exhibited, and tooth grinding practice can be easily performed even without water injection equipment. As the wax-based composition, both natural wax and synthetic wax can be used. Examples of natural waxes include animal and plant waxes, mineral waxes, and petroleum waxes. Compound wax, polyethylene wax, etc. can be used as the synthetic wax. Paraffin wax is preferred. The wax system also includes fats and oils. Oils and fats are glycerin esters of fatty acids. Not soluble in water but soluble in alcohol. It is preferably a fat that is solid at room temperature (37 ° C., atmospheric pressure). There are vegetable waxes, animal beef tallow and pork tallow. Specifically, lauric acid, myristic acid, palmitic acid, behenic acid, stearic acid, fats and oils extracted from a living body, and the like can be used, and fats and oils extracted from a living body are preferable. Particularly, fats derived from pigs and cows are preferable (representative examples include lard and head).

Impregnation can be assisted by mixing the surfactant during the impregnation. That is, the surfactant auxiliary agent plays an important role in impregnating the voids of the fired body with these water-soluble materials or heat-soluble materials.
Surfactants can also be used as water-soluble materials.
As the surfactant, an anionic, nonionic, cationic, zwitterionic or the like can be used as appropriate. Anionic and nonionic are preferable.
As anion system, fatty acid salt (soap) C11H23COONa, alpha sulfo fatty acid ester salt (α-SFE) C10H21-CH (SO33Na) COOCH3, alkylbenzene sulfonate (ABS) C12H25- (C6H4) SO3Na, alkyl sulfate (AS ) [Higher alcohol type] C12H25-OSO3Na, alkyl ether sulfate ester (AES) C12H25-O (CH2CH2O) 3SO3Na, alkyl sulfate triethanolamine
C12H25-OSO3-. + NH (CH2CH2OH) 3 or the like is used.
Nonionics include fatty acid diethanolamide C11H23-CON (CH2CH2OH) 2, polyoxyethylene alkyl ether (AE) C12H25-O (CH2CH2O) 8H, polyoxyethylene alkylphenyl ether (APE) C9H19- (C6H4) O (CH2CH2O ) 8H etc. are used.
As the cationic system, alkyltrimethylammonium salt C12H25-N + (CH3) 3 ・ Cl-, dialkyldimethylammonium chloride C12H25-N + (C8H17) (CH3) 2 ・ Cl-, alkylpyridinium chloride C12H25- (N + C5H5) ・ Cl -Etc. are used.
As the zwitterionic system, alkylcarboxybetaine [betaine system] C12H25-N + (CH3) 2 · CH2COO- and the like are used.

A method for impregnating a water-soluble material or a heat-soluble material will be described below.
The water-soluble material or heat-soluble material to be impregnated is put into a beaker and heated to an appropriate temperature to lower the viscosity. Add moderate surfactant. When the viscosity drops, the ceramic fired body is charged and placed in a vacuum desiccator. As the air in the vacuum desiccator is evacuated and the air in the ceramic fired body is released to the outside. As the pressure is reduced, bubbles appear on the surface of the fired body and the inside air is released. Look at the situation and when the air comes out, impregnate it by gently returning the air to the desiccator.

(Manufacture of fired teeth)
A mold capable of injection molding the shape of the tooth form was produced. Using 1 kg of alumina pellets for CIM (26% Al ₂ O ₃ , 44% SiO ₂ , average particle size 3.0 μm, 30% stearic acid) as a raw material for teeth, injection molding into a mold of tooth shape A projectile was obtained.
The fired body 1 was obtained by degreasing and firing (1300 ° C., mooring time 10 minutes) of the produced injection body in the form of a tooth portion.
(Production of fired body of enamel part and dentin part)
A mold was prepared that can injection-mold the female shape of the enamel part and dentin part of the tooth form. Since both the enamel part and the dentin part are shrunk by degreasing and firing after molding, the part was largely calculated in advance to prepare a mold. The mold was adjusted for each material.
Using 1 kg of alumina pellets for CIM (68% Al ₂ O ₃ , 2% SiO ₂ , average particle size 0.3 μm, 30% stearic acid) as a raw material for the enamel part, it is injected into a dental mold Molded to obtain an injection body.
A fired body 2-1 was obtained by degreasing and firing (1550 ° C., mooring time 10 minutes) of the produced injection body in the form of the enamel portion.
Using 1 kg of alumina pellets for CIM (68% Al ₂ O ₃ , 2% SiO ₂ , average particle size 5.0 μm, 30% stearic acid) as a raw material for dentin, injection into a dental mold Molded to obtain an injection body.
The produced injection body in the form of the dentin portion was degreased and fired (1400 ° C., mooring time 15 minutes) to obtain a fired body 2-2.

(Impregnation)
It was confirmed that the obtained fired bodies 1, 2-1, 2-2 were embedded in each of the following immersion materials, placed in a vacuum vessel and vacuumed to sufficiently impregnate the voids of the fired body. The fired bodies 2-1 and 2-2 were joined and bonded with an epoxy resin adhesive.
The cutting feeling of the produced tooth was confirmed. 30 fired bodies were prepared and tested.

(Immersion material tested)
Paraffin wax (Nippon Seisaku Co., Ltd., paraffin wax standard product): It was confirmed that it was liquefied by heating sufficiently before immersion.
Beeswax (Mezarashi dense wax wax): It was confirmed that it was liquefied by heating sufficiently before immersion.
Cellulose (Shin-Etsu Chemical Co., Ltd., SM-8000): A silicone resin to which a catalyst was added was used. After leaving for 72 hours, the cutting feeling was confirmed with a diamond bar.
Konjac mannan (Ina Food Industry): It was dissolved in hot water and heated to an appropriate hardness. The coagulant was added before entering the desiccator.
Agar (Ina Food Industry): It was melted with hot water and heated to an appropriate hardness.
Gelatin (Nitta Gelatin): It was dissolved in hot water and heated to an appropriate hardness.
In Comparative Examples 1 and 2, fired bodies that were not impregnated were used.

In the test method, cutting was performed using a diamond abrasive (using an air turbine) that rotated at a high speed of 400000 rpm. Examples 1, 2, 7, and 8 were tested without water injection. Other examples and comparative examples were tested while pouring water.

A: The result was as good as natural teeth.
○ (cutting feeling): Dentin and enamel could not be expressed sufficiently. The enamel part was soft, but I felt the same stickiness as natural teeth.
○ (cutting): There was a slight elasticity rather than stickiness.
Δ (cutting): The stickiness felt softer than natural teeth.
◎ (Biological wet feeling): Like natural teeth, there is a wet feeling of the living body, and there is a wet feeling that feels flesh. It was a good result.
○ (Biological wet feeling): Although there was a biological wet feeling like natural teeth, it is slightly inferior to ◎ although it has a flesh texture.
Δ (Biological wet feeling): It felt that the wet feeling of the living body was different from that of natural teeth.
X: Stickiness at the time of cutting was not felt, and dust was scattered greatly.

In Examples 1, 2, 7, and 8, the stickiness was felt as compared with Comparative Examples 1 and 2, and a cutting feeling similar to that of natural teeth was obtained. The feeling of body fluid from the ivory tubules was also similar. The cut dust was less than that of Comparative Example 1, and the scattering was less. There was no need for water injection, and cutting was easy. It was confirmed that tooth cutting practice could be done easily without water injection. Moreover, the living body had a wet feeling like natural teeth, but the feeling of melting wax was slightly different from that of the living body.
In Examples 3 and 9, stickiness was felt compared to Comparative Examples 1 and 2, and a cutting feeling close to that of natural teeth was obtained. Although elution of cellulose was observed by water injection, the test was completed without any problem. The cut dust was less than that of Comparative Example 1, and the scattering was less. However, I felt that the wet feeling of the living body was different.
In Examples 4, 5, 6, 10, 11, and 12, stickiness was felt as compared with Examples 3 and 9, and a cutting feeling similar to that of natural teeth was obtained. The feeling of body fluid from the ivory tubules was also similar. The cut dust was less than that of Comparative Example 1, and the scattering was less. Cutting experience was easy even under water injection. It was confirmed that tooth cutting practice can be easily performed in an actual clinical use environment under water injection. Moreover, the living body had a wet feeling like natural teeth, and the result was good.
(Example 13)
As a dipping material, a tooth was prepared by dipping in fired bodies 1 and 2 using a head (beef tallow). It was confirmed that the product was sufficiently liquefied by heating before immersion. As a result of cutting after cooling for 24 hours, the cutting feeling, the cutting feeling and the wet feeling of living body were good. In particular, the bio-like wet feeling was superior to other materials. The feeling of slipping at the time of cutting and the odor when cutting too hard were still close.

Claims (5)

A tooth for a jaw and tooth model for treatment practice, wherein the tooth is made of a ceramic fired body, and the void portion of the ceramic fired body is impregnated with wax or oil. . A tooth for a jaw and tooth model for treatment practice, wherein the tooth is made of a dentin part and an enamel part made from a ceramic fired body. A tooth for jaw model, which is impregnated with A tooth for a jaw and tooth model for treatment practice, wherein the tooth is made of a ceramic fired body, and a void portion of the ceramic fired body is impregnated with a water-soluble material. . A tooth for a jaw and tooth model for treatment practice, wherein the tooth is a tooth for a jaw and tooth model consisting of a dentin part and an enamel part made from a ceramic fired body. A tooth for jaw model, which is impregnated with Teeth for a jaw and tooth model for treatment practice,
The dentine part and the enamel part are made of an inorganic powder fired body.