JP2007323052A - Composite 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 that dental students who want to be dentists use for a dental arch model to conduct dental works in the oral cavity in practice, more specifically, a tooth composition used to experience formation trainings such as anchor tooth formation and cavity preparation, and a method of producing the same. <P>SOLUTION: Disclosed is the tooth for the dental arch model. The tooth is made of a ceramic baked body, whose gap portions are impregnated with resin or silicon, or impregnated with thermosetting resin, thermoplastic resin, or acrylic resin, etc. <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.
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.

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. 5-216395 introduces the provision of a tooth model having a cutting ability very similar to that of a natural tooth and suitable for dental education cutting practice and a manufacturing method thereof. Contains hydroxyapatite powder with porosity of 40-80% and (meth) acrylic ester resin as a major 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 machinability is desired, it does not show sufficient cutting feeling. In particular, there is a demand for a tooth having a stickiness peculiar to natural teeth, and it is not a tooth model that can 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 surface of the crown portion of the model tooth of the present invention, generally known materials can be used. For example, ceramics or other porcelain or acrylic, polystyrene, polycarbonate , Thermoplastic resin materials such as acrylonitrile styrene butadiene copolymer (ABS), polypropylene, polyethylene and polyester, thermosetting resin materials such as melamine, urea, unsaturated polyester, phenol and epoxy, 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 the 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.

The present invention is 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 either resin or silicon. It is a tooth for a jaw 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 thermosetting resin or a thermoplastic resin. This is a characteristic tooth for jaw model.
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 an acrylic resin or an epoxy resin.

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 chemically polymerizable resin.
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.

In the present invention, the jaw model tooth can obtain a cutting feeling similar to that of a natural tooth. Although a sufficient cutting feeling could not be reproduced with the powder fired body alone, it could be reproduced with 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.
By impregnating a thermosetting resin or a resin containing a crosslinking agent, a soft cutting feeling close to that of a natural tooth is obtained as compared with a case where no impregnation is performed. Compared to the case where the thermoplastic resin is impregnated, the cutting feeling is close to that of a natural tooth. These resins can reproduce the feeling of clumping without dissolving even when water is used at the same time.
Although this invention can be used for both a dentin part and an enamel part, it is particularly preferable to use it for a dentin part.

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 dentin portion is preferably 10 times or more than the average particle size of the enamel 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, degreased and fired, and the interface between the fired enamel part and the dentin part is used with an adhesive of thermosetting resin or chemically polymerizable resin. It is also preferable to bond them together.

The present invention is characterized in that an organic material is impregnated in a space portion in a ceramic fired body of a jaw tooth model tooth.
The organic material impregnated in the space portion of the present invention is preferably at least one of a thermosetting resin, a thermoplastic resin, and a resin containing a crosslinking agent.

As the resin to be impregnated 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 and the like can be used as appropriate.
In particular, acrylic, styrene, urethane, and polyamide 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 into the voids 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 resin used for the adhesive is preferably a thermosetting resin or a chemically polymerizable resin among thermosetting resins, thermoplastic resins, and chemically polymerizable resins.

(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 produced tooth-shaped injection body was degreased and fired (1300 ° C., mooring time 10 minutes) to obtain fired body 1.
(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. 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.

(Resin impregnation)
The obtained fired bodies 1, 2-1, 2-2 were embedded in the following materials, placed in a vacuum container, and confirmed to be sufficiently impregnated in the voids of the fired body by making a vacuum, The fired bodies 2-1 and 2-2 were joined to cure the resin.
The cutting feeling of the produced tooth was confirmed. 30 fired bodies were prepared and tested.
(Resin tested)
Epoxy resin (low viscosity epoxy resin Z-2 / H-07): An epoxy resin to which a catalyst was added was used. After leaving for 72 hours, the cutting feeling was confirmed with a diamond bar.
Acrylic resin (manufactured by Kuraray, MMA monomer): An acrylic resin to which a chemical polymerization catalyst was added was used. After leaving for 72 hours, the cutting feeling was confirmed with a diamond bar.
Silicon resin (RTV silicone resin M8017: Asahi Kasei): 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.
Comparative Example: A fired body not impregnated was used as a comparative example.

A: The result was as good as natural teeth.
○ (cutting feeling): Dentin and enamel could not be expressed sufficiently.
○ (cutting): There was a slight elasticity rather than stickiness.
X: Stickiness at the time of cutting was not felt, and dust was scattered greatly.
A (cutting pulverization feeling): There was almost no pulverization feeling at the time of cutting, and it was a feeling of cutting a living tooth.
○ (cutting pulverization feeling): A feeling of pulverization at the time of cutting was felt.
X: Stickiness at the time of cutting was not felt, and dust was scattered greatly.

In Example 1.2, stickiness was felt as compared with Comparative Example 1, and a cutting feeling similar to that of natural teeth was obtained. The cut dust was less than that of Comparative Example 1, and the scattering was less. There was almost no crushing feeling peculiar to ceramics at the time of cutting, and it was close to the sense of cutting living teeth.
In Example 3, stickiness was felt as compared with Comparative Example 1, and a cutting feeling similar to that of natural teeth was obtained. The cut dust was less than that of Comparative Example 1, and the scattering was less. Compared with Example 1.2, there was much scattering amount. The cutting feeling is similar to natural teeth. Compared to Example 1.2, it seems that the feeling of resistance of natural teeth when cutting is slightly inferior. Although inferior to Examples 1 and 2, the state of natural teeth could be reproduced.
In Example 4.5, stickiness was felt as compared with Comparative Example 2, and a cutting feeling similar to that of natural teeth was obtained. The cut dust was less than that of Comparative Example 2, and the scattering was also small. Even when the layer was transferred from the enamel part to the dentin part, it had a cutting feel similar to that of natural teeth that felt sticky. There was almost no crushing feeling peculiar to ceramics at the time of cutting, and it was close to the sense of cutting living teeth.
In Example 6, stickiness was felt as compared with Comparative Example 2, and a cutting feeling similar to that of natural teeth was obtained. The cut dust was less than that of Comparative Example 2, and the scattering was also small. Compared with Example 4.5, there was much scattering amount. The cutting feeling is similar to natural teeth.
Even when the layer was transferred from the enamel portion to the dentin portion, the cutting feeling was the same as that of natural teeth that felt stickiness, but the resistance feeling different from that of natural teeth seems to be slightly inferior to Example 4.5. Although inferior to Example 4.5, the state of natural teeth could be reproduced.

Claims (5)

Teeth for a jaw and tooth model for treatment practice,
A tooth for a jaw and tooth model, wherein the tooth is made of a ceramic fired body, and a void portion of the ceramic fired body is impregnated with either resin or silicon. Teeth for a jaw and tooth model for treatment practice,
A tooth for a jaw and tooth model, wherein the tooth is made of a ceramic fired body, and a void portion of the ceramic fired body is impregnated with a thermosetting resin or a thermoplastic resin. A tooth for a jaw tooth model for treatment practice, wherein the tooth is made of a dentin portion and an enamel portion made of a ceramic fired body, and an acrylic resin or an epoxy resin is formed in the void portion of the ceramic fired body. A tooth for jaw model, which is impregnated. A tooth for a jaw and tooth model for treatment practice, in which a tooth is made of a dentin part and an enamel part made of a ceramic fired body, and the cavity part of the ceramic fired body is impregnated with a chemically polymerizable resin A tooth for a jaw and tooth model. 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.