JP5173241B2 - Manufacturing method of tooth with pulp for jaw model - Google Patents

Description

The present invention is a tooth used for a jaw and tooth model in which a student who aims to become a dentist experiences an intraoral work and practice treatment. More specifically, the present invention relates to a method for producing a tooth that is used to experience treatment related to the pulp such as demyelination, pulp extraction, and root canal filling, and to experience the provision of shapes such as abutment tooth formation and cavity formation.

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, epoxy resins and melamine resins tend to be soft and increase cutting, and natural teeth tend to be hard to cut as expected because they are hard. Even in hard natural teeth, the dentin part is hard, but the enamel part is harder. 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 particular, in the treatment of odontogenic nerves and medulla, sufficient learning is not possible with conventional teeth. I couldn't fully practice the treatment of cutting from the dentin to the marrow and extracting it. In addition, using reamers, we were not able to practice pulp extraction.

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 white root, red and yellow colorants are added to the polyol (main ingredient) in the root layer, and an isocyanate prepolymer (curing agent) is further mixed into the silicone rubber base material. 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. Although the dental pulp is composed, since the dentine layer is an adhesive, the experience of demyelination from the dentine to the dental pulp was completely different from that of natural teeth. Furthermore, even when performing pulp extraction, the dental pulp was removed with a reamer, and the sense of rubbing the dentinal wall surface with the reamer was completely different, so practice such as root canal filling was not possible.

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.

So far, no method has been developed to reproduce the pulp that is unique to natural teeth, and dental students have never been able to experience open-bone experience. Some dental pulp treatments are used for practicing root canal treatment, but the box-shaped acrylic has a small hole, and practicing root canal treatment (root canal cleaning, root canal dilation, etc.) Yes. However, due to the fact that it cannot be worn on the chin and the hardness of dentin, etc., there is a situation where sufficient practice has not been achieved.
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 showing a difference in machinability. 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. There is a possibility of infection if hygiene is not adequately controlled, and practice must be freely prevented to prevent infection. . 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 the cutting powder scattered in the folds of teeth.
It is important to treat the medulla in the treatment of teeth, but there are no teeth that can be easily practiced for therapeutic actions such as demyelination, pulpectomy, root canal filling, and so on. There is a need to practice treatment as well.

The present invention is a tooth having a dentin portion and an enamel portion and a pulp portion for a jaw and tooth model for treatment practice, wherein the dentin portion and the enamel portion are an inorganic powder fired body, and the pulp portion is a resin or a central portion of the tooth. It is a tooth for a jaw and tooth model characterized by comprising any one or more of silicone rubber.

The present invention is a tooth having a dentin part and an enamel part, a dental pulp part for a jaw and tooth model for treatment practice, wherein the dentin part and the enamel part are an inorganic powder fired body, and the dental pulp part is a wax in the central part of the tooth, A tooth for a jaw and tooth model comprising any one or more of water-soluble materials.

The present invention is a tooth for a jaw and tooth model for treatment practice, a burning pulp preparation step for molding a pulp of combustible material formed into a pulp shape using a combustible material, and a predetermined position in a tooth mold Mold setting process to set the flammable material pulp in, injection process to inject inorganic powder and binder into the tooth mold to obtain non-fired teeth, baking process to burn non-fired teeth to obtain fired teeth, fired It is a tooth for a jaw and tooth model obtained by passing through a pulp preparation process in which a dental pulp portion is filled with resin, silicone rubber, wax, and a water-soluble material.

The present invention provides a tooth for a jaw and tooth model, wherein a dentin portion and an enamel portion are injected in an injection process.

The present invention relates to a method of manufacturing a tooth for a jaw model for treatment practice, a burning pulp preparation step for molding a combustible material pulp formed into a pulp shape using a combustible material, and a predetermined tooth mold Mold placement process to place the flammable material pulp in the position of the injection, injection process to inject inorganic powder and binder into the tooth mold to obtain a non-fired tooth, firing process to fire a non-fired tooth to obtain a fired tooth, firing This is a method for producing a tooth for a jaw and tooth model, which is characterized by undergoing a pulp preparation step in which the dental pulp portion is filled with resin, silicone rubber, wax, and a water-soluble material.

The present invention is a method for producing a tooth for a jaw and tooth model, wherein a dentin portion and an enamel portion are injected in an injection step.
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 baking processes, and bonding the dentin portion and the enamel portion using an adhesive. For 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. In addition, you can experience the most undisclosed treatment (cutting down to the portion of the medulla), which is the most problematic, and learn at the same time that it is a clear failure and the subsequent treatment method.
As caries of natural teeth progresses, the treatment method also advances to the enamel layer, dentin layer, and medulla. Practical training in root canal treatment such as extraction is also an important treatment. There is a demand for a model for jaw teeth that can facilitate these experiences. Especially when cleaning the root canal, it is difficult for beginners to learn whether the medulla has been completely removed up to the dentin layer. However, it is possible to easily experience root canal treatment by practicing with this tooth.
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.

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 where it is used. 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.

In the present invention, the tooth portion can be integrally formed, and only the dental pulp can be made of resin or silicon rubber. It is preferable that the tooth portion is separated from the enamel layer and the dentin layer.
Further, according to the present invention, the tooth portion can be formed integrally, and only the pulp can be made of wax or a water-soluble material. It is preferable that the tooth portion is separated from the enamel layer and the dentin layer.
The tooth composition of the present invention is preferably produced from ceramics. The composition of the tooth of the present invention is an inorganic powder fired body, and is produced from ceramics or glass such as alumina, zirconia, silica, aluminum nitride, 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 portion and the dentin portion, it is preferable to use the CIM technique in a ceramic forming method.
Using CIM technology, the enamel part and the dentin part are injection molded, degreased and fired, and then the fired enamel part and the dentin part are bonded using an adhesive of thermosetting resin or chemically polymerizable resin. It is also preferable to do.

The resin of the pulp portion in the ceramic fired body of the tooth for a jaw and tooth model of the present invention includes at least one of an elastic resin, a foamed resin, a thermosetting resin, a thermoplastic resin, and a resin containing a crosslinking agent. . Preferably, it is an elastic resin or a foamed resin.

As the resin of the dental pulp portion used in the present invention, a thermosetting resin or a thermoplastic resin can be used. A thermosetting resin or a resin containing a crosslinking agent is preferred. Furthermore, an epoxy resin is preferable. Thermoplastic resin refers to a resin that can be molded to a degree of thermoplasticity by applying heat, and thermosetting resin refers to a resin that crosslinks and cures when heated. Specifically, acrylic, styrene, olefin, vinyl chloride, urethane, polyamide, polybutadiene, polyacetal, saturated polyester, polycarbonate, polyphenylene ether, rubber, vinyl, polyvinyl acetate and the like can be used as appropriate. In particular, elastic resins such as urethane and rubber, and foamed resins are preferable.

A thermosetting resin is preferred to a thermoplastic resin. A thermosetting resin does not dissolve in a solvent after processing and does not soften even when reheated. A urea resin, a melamine resin, a phenol resin, an epoxy resin, and the like can be typically used, and a melamine resin and an epoxy resin are preferable. Most preferred is an epoxy resin.
It is preferably a chemically polymerizable resin. This is because the resin is impregnated in the space portion of the particles of the fired body and can be easily cured.

The chemically polymerizable resin is a resin that is polymerized using a chemical catalyst even if it is originally contained in a thermosetting resin or a thermoplastic resin. Particularly preferred are those containing a cross-linking material and having no thermoplasticity.

The silicone rubber of the pulp portion in the ceramic fired body of the jaw tooth model tooth of the present invention can be specified without any limitation. As rubber materials that can be used in many ways, chlorosulfonated polyethylene rubber: hyperon rubber, fluoro rubber, isobutene isoprene rubber: butyl rubber, natural rubber, acrylonitrile butadiene rubber: hiker, urethane rubber, ethylene propylene rubber, styrene butadiene rubber, chloroprene rubber: Neoprene is exemplified. Rubber height (durometer (JIS K 6253)) is 10 to 70, preferably 20 to 50.

The wax of the pulp portion in the ceramic fired body of the tooth for a jaw and tooth model of the present invention includes animal-derived wax (bee wax, spermaceti, shellac wax, etc.), plant-derived wax (carnauba wax, wood wax, rice bran wax (rice) Wax), candelilla wax), petroleum-derived wax (paraffin wax, microcrystalline wax), mineral-derived wax (montan wax, ozokerite), synthetic wax (Fischer-Tropsch wax, polyethylene wax, oil-based synthetic wax (ester, ketone) Class, amide), hydrogenated wax) and the like. A wax derived from petroleum is preferable, and paraffin wax is particularly preferable.
The water-soluble material of the pulp portion in the ceramic fired body of the tooth for a jaw and tooth model of the present invention contains at least one of polysaccharides and proteins. The water-soluble material can exert its effect by pre-impregnation with water injection or water. Protein is preferred.
A hydrophilic polymer is also preferred as the water-soluble material. For example, synthesis of polyvinyl alcohol (PVA), polyacrylic acid polymer, polyacrylamide (PAM), polyethylene oxide (PEO), etc. from cellulose derivatives such as semi-synthetic carboxymethylcellulose (CMC) and methylcellulose (MC) derived from nature Water-soluble polymers of the system can be used. .

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. Further preferred are starch, gelatin, agar, collagen and elastin. Still more preferred are gelatin and agar. This is because it is necessary to maintain the shape of the pulp, rather than dissolving it in water.

The combustible material may be any material that can be shaped into a pulp shape and can be burned when the tooth is baked to create a pulp space without being deformed by the injection pressure and temperature when the tooth is formed. Specifically, it is a resin, and particularly preferably a thermosetting resin. Specifically, a urea resin, a melamine resin, a phenol resin, an epoxy resin, an acrylic resin, or a styrene resin may be used after being crosslinked.

The burnable pulp preparation process that forms the pulp of the combustible material molded into the pulp shape using the combustible material is the pulp shape in advance with the material that burns when the tooth is fired to form the pulp shape of the tooth Is a step of forming.
Since a tooth made of an inorganic material undergoes a firing process, a space is made with a combustion material at the time of firing, and the tooth is later filled with a material suitable for the pith to complete the tooth. This is the pulp shape preparation process.
The mold installation process of installing the combustible material pulp at a predetermined position in the tooth mold is a process of installing the combustible material pulp in the mold. The flammable material pulp that has been molded in advance may be placed in the mold, or the flammable material pulp that has been molded in-situ on the spot may be reinserted into the tooth-shaped mold.

The injection process of injecting inorganic powder and a binder into a tooth mold to obtain a non-fired tooth is a process of injecting an inorganic powder and a binder having a tooth composition that is heated and mixed in a tooth mold having a combustible material pulp. In this process, the flammable pulp is thin and must be injected carefully. Further, when the tooth shape is divided into a dentin layer and an enamel layer, only the dentin layer may be formed.
The firing step of firing the non-fired tooth to obtain the fired tooth is a step of firing the non-fired tooth obtained in the injection step. In the firing step, the firing temperature is 800 to 1200 ° C. when the glass content is high, and the firing temperature is 1200 to 1600 ° C., preferably 1400 to 1550 ° C. in the case of alumina. At this time, the flammable material pulp burns to form a space portion.

The pulp preparation process that fills the fired pulp with resin, silicone rubber, wax, and water-soluble material is to provide a pseudo pulp with resin, silicone rubber, wax, and water-soluble material in the space of the fired pulp It is a process. There are a method of filling with a syringe or the like, and a method of filling the pulp portion of the fired body by embedding it in a pseudo pulp material, putting it in a vacuum container, and making it vacuum.
It is necessary to bond these parts by injecting the dentin part and the enamel part separately, but the resin used for the adhesive is a thermosetting resin, a thermoplastic resin, or a chemically polymerizable resin. Chemically polymerizable resins are preferred.

(Production of combustible material pulp)
The wax made into the dental pulp shape of the target tooth was made with silicone rubber, and epoxy resin was poured into the silicone rubber to obtain a flammable dental pulp.
(Manufacture of fired teeth)
A mold capable of injection-molding the target shape of the tooth form was produced. A stop was provided for the mold so that the combustible material pulp could be installed. Dental form with combustible material pulp using 1 kg of alumina pellet for CIM (26% Al ₂ O ₃ , 44% SiO ₂ , average particle size 0.3 μm, 30% stearic acid) Were molded by injection molding to obtain an injection body.
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 capable of injection molding the target shapes of the enamel part and dentin part of the tooth form was produced. A stop was provided for the mold so that the combustible material pulp could be installed. 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.
Teeth with combustible material pulp using 1 kg of alumina pellets for CIM (68% Al ₂ O ₃ , 2% SiO ₂ , average particle size 5.0 μm, stearic acid 30%) as raw material for dentin portion The molded body was injection 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. The fired bodies 2-1 and 2-2 were joined and bonded with a resinous adhesive to obtain a fired body 2.

(Injection of dental pulp material)
Each of the following materials was injected into the space of the dental pulp of the fired bodies 1 and 2 obtained with a syringe.
The cutting feeling of the produced tooth was confirmed. 30 fired bodies were prepared and tested.
(Resin tested)
Polyvinyl alcohol: Filled with polyvinyl alcohol and dried. After leaving for 72 hours, the cutting feeling was confirmed with a diamond bar.
Urethane rubber hardness 30: Urethane rubber added with a chemical polymerization catalyst was used. After leaving for 72 hours, the cutting feeling was confirmed with a diamond bar.
Silicon rubber (RTV silicone rubber resin M8017: Asahi Kasei): A silicone rubber resin to which a catalyst was added was used. After leaving for 72 hours, the cutting feeling was confirmed with a diamond bar.
Comparative example: As a comparative example, an enamel dentin part prepared with epoxy (Comparative Examples 1 to 3) and a melamine resin (Comparative Examples 4 to 6) were prepared, and the same resin as that of the example was applied to the dental pulp part. Injected.

(Test method)
Ten dentists were asked to evaluate the following test items for the samples of Examples 1 to 6 and Comparative Examples 1 to 6. Each sample was cut in triplicate. The following table shows the most frequent evaluation results.
With the pulp sensation, the enamel layer and the dentin layer were scraped from the occlusal surface to treat the pulp, and the cutting sensation when reaching the medulla was evaluated.
Root canal cleaning refers to the evaluation results of cleanability, in which a thin cutting tool called a reamer is inserted into the root canal and the marrow in the root canal is scraped and cleaned.
The root canal enlargement refers to an evaluation result of expandability in which the inside of the root canal is expanded so that the root canal filling material can be easily filled in the cleaned root canal.

◎：天然歯同様に良好な結果であった。
○：デンチンと髄の切削感が異なり十分に表現できていなかったが、練習には十分に耐えれるものであった。
△：デンチンと髄との界面の切削感覚が異なり、天然歯と異なるものであった。
×：歯牙の切削感が全く異なり、露髄時の粘りが感じられず、根管清掃、根管拡大時も感覚が異なった。

A: The result was as good as natural teeth.
○: Dentin and spinal cord had different cutting feelings and could not be expressed sufficiently, but they were able to withstand practice well.
(Triangle | delta): The cutting sensation of the interface of a dentin and a marrow was different, and was different from a natural tooth.
X: The cutting feeling of the teeth was completely different, the stickiness at the time of demyelination was not felt, and the feeling was different when root canal was cleaned and root canal was enlarged.

In Examples 1 and 4, a good exposure experience was possible, and although the root canal cleaning felt a little hard, the experience of root canal treatment was fully felt. There is also a part that can be evaluated more than Examples 2, 3, 5, and 6 because the medullary feel is felt.
In Examples 2, 3, 5, and 6, compared to Examples 1 and 4, it was possible to experience a better exposure and to fully experience the experience of root canal treatment such as root canal cleaning and root canal enlargement. . The sensation at the interface between the marrow and dentin was similar. The sense of removing the medulla during root canal cleaning was also similar.
In Comparative Examples 1 and 3, the interface state of the epoxy or melamine resin dentin and polyvinyl alcohol, urethane rubber, silicon rubber or the like was different, and it was not possible to reproduce the cutting feeling approximate to that of natural teeth. The sensation when exposed was greatly different. The root canal cleaning was different from natural teeth because it slid with epoxy and melamine resin. The root canal enlargement was greatly different in the sense of sharpening dentin.

Claims (2)

A method for manufacturing a tooth for a jaw and tooth model for treatment practice,
A calcinable pulp preparation process for molding a combustible material pulp formed into a pulp shape using a combustible material,
A mold installation process for installing a flammable material pulp in a predetermined position in a tooth mold,
An injection process in which inorganic powder and a binder are injected into a tooth mold to obtain a non-fired tooth,
A firing step of firing a non-fired tooth to obtain a fired tooth;
A method for producing a tooth for a jaw and tooth model, characterized by undergoing a pulp preparation step in which the calcined dental pulp is filled with resin, silicone rubber, wax, and a water-soluble material. 2. The method for producing a tooth for a jaw and tooth model according to claim 1, wherein the dentin portion and the enamel portion are injection-molded in the injection step.