JPS61103184A - Artificial tooth for training and manufacture thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention provides technical training for a wide variety of endodontic treatments, such as cutting, pulp extraction, root canal treatment, root canal formation, and root canal filling, in clinical dentistry. This invention relates to an artificial tooth for training that allows users to freely and effectively perform training, and a method for manufacturing the same.

(Conventional technology) In other words, during dental treatment, endotherapy begins with the expansion of the pulp chamber, and in clinical practice, operations such as pulp cutting, pulp extraction, root canal treatment, etc. are performed without paying much attention to the shape of the pulp chamber. In many cases, this is a major cause of treatment failure, and in order to deeply understand the complexity of root canals and the difficulty of treatment, it is important to understand the structural anatomy of root canals. A thorough understanding of the scientific complexity is the most basic theory for successful endotherapy, and when cutting, pay attention to the shape of the tooth, the position and size of the pulp chamber, the inclination of the tooth, etc., and the direction. It was necessary to be careful not to make any mistakes, especially not to perforate the neck of the anterior tooth, the pulp wall, or the bottom of the pulp bed. For this reason, technical training has traditionally been conducted through research and practical training on endotherapy using various artificial teeth. However, the internal structure of the natural tooth, i.e., the internal position and relationship of the pulp cavity, pulp, etc., or the structure of the enamel, dentin, etc., has the disadvantage that it cannot be said to be extremely appropriate compared to that of the natural tooth. was there.

Therefore, when conducting research and practice on endotherapy, it was customary to either use a very small number of natural teeth, or to use artificial teeth, despite the fact that they had various drawbacks.

(Problems to be Solved by the Invention) The present invention is directed to various aspects of artificial teeth used for the above-mentioned endotherapy, particularly for training in techniques such as cutting, pulp extraction root canal treatment, root canal formation, and root canal filling. This was invented for the purpose of solving the problem, and it aims to provide an artificial tooth that is manufactured using the shape and structure of the crown and root of a natural tooth as a model, as well as the dental pulp and pulp cavity, using the natural tooth as a model. It is.

(Means for solving the problem) That is, the artificial tooth for training of the present invention and its manufacturing method use, as a first step, a freely selected natural tooth as a prototype, and the pulp of the tooth is applied with a hand tool such as a cleanser. For example, an epoxy resin material is poured into the pulp cavity of the tooth after the pulp has been accurately extracted using a method to create an artificial dental pulp. After making a negative mold of the natural tooth, if the dentin of the natural tooth is dissolved with strong acid, a pulp model of the epoxy resin that was previously filled into the pulp cavity will remain. A negative mold of the dental pulp model made of the remaining epoxy resin material is created, and then, as a second step, for example, a soft synthetic resin material is poured into the negative mold of the dental pulp model to create an artificial dental pulp for an artificial tooth for training. The artificial tooth pulp is inserted into the negative mold for dentin prepared earlier, and an ivory-colored synthetic resin phase is poured to mold the dentin part of the artificial tooth for training, and then the crown part of the dentin part is placed first. By using the negative mold of the crown of the tooth prepared in 1995 and molding the crown by pouring a crown-colored synthetic surface fat material, an artificial tooth for training that can be said to have exactly the same form, structure, and properties as a natural tooth can be created. It can be manufactured.

(Example) Next, an example of the artificial tooth for training of the present invention and its manufacturing method will be described with reference to the accompanying drawings.

Figure 1 is a side view of an artificial tooth A for training manufactured according to the present invention, in which (a) shows an artificial tooth for training of a central incisor molded using an opaque epoxy resin material, and (a) shows an artificial tooth for training for central incisors molded using an opaque epoxy resin material; This shows an artificial tooth for training of molars molded using epoxy resin material, and 1 in the figure is the main body of the artificial tooth.

2 is the crown of the tooth covered with enamel. 3 is the dentin-like tooth root. 4 is the pulp cavity. 5 is the dental pulp prototype.

5' is the artificial tooth pulp. 6 indicates the apical foramen. Figure 2 to Figure 9 are drawings showing the manufacturing process of the artificial tooth A for training of the present invention, and Figure 2 is a cross-sectional view of a freely selected natural tooth B using a hand tool such as a cleanser. This figure shows a pulp extraction hole 7 drilled to extract the natural pulp 9 in the pulp cavity 4 to the outside.

Figure 3 shows the natural pulp 9 in the pulp cavity from the pulp extraction hole 7 of natural tooth B.
After extracting the pulp externally, a soft synthetic resin material, for example, is poured into the empty pulp cavity 4 from the pulp extraction hole 7 to form a pulp model 5, and after the work is completed, a guide 8 prepared in advance is fitted into the pulp extraction hole 7. FIG. FIG. 4 is a cross-sectional view of a negative mold C of the crown region, which is made up of an upper mold 10 and a lower mold 11, which are made using the natural tooth B that has undergone the above-mentioned work as a prototype. In the embodiment shown in Fig. 5, when the natural tooth B has multiple root parts 6 such as the first, second, and sixth molars, the lower mold 11 of the negative mold C is divided into two and a lower mold 11' is added. A transparent perspective view showing the state of use is shown respectively. Figure 6 shows upper and lower molds 10 and 11 of the root of the dentin plane prepared by dissolving the enamel constituting the crown 2 of natural tooth B with a weak acid to expose the dentin of natural tooth B. This is a cross-sectional view of a negative mold C'. FIG. 7 is a side view of the natural tooth B having the tooth root with exposed dentin after the above-mentioned work has been dissolved with strong acid to leave the internal pulp prototype 5.

Fig. 8 is a cross-sectional view showing a state in which an artificial dental pulp 5' is molded by pouring a soft synthetic resin material into a negative mold C'' prepared using a dental pulp prototype. A sectional view showing a state in which the artificial tooth @5 is inserted and positioned in the negative mold C', and then a dentin-colored synthetic resin material is poured to mold the dentin root part 3 of the artificial tooth main body 1. After inserting and positioning the tooth root part 6 of the artificial tooth main body 1 molded in the above-mentioned process into the negative mold C, a tooth crown-colored synthetic resin material is poured in to form the tooth crown part 2. This is an indication.

Next, the functions and effects of the artificial tooth for training of the present invention and its mounting method will be explained in detail as follows.

That is, as a first step, a natural tooth B necessary for producing an artificial tooth for training is freely selected and a pulp extraction hole 7 is bored. In pulp extraction, a root canal is generally opened from the crown of the tooth, but in the present invention, since it is necessary to preserve the crown, the root canal is drilled on the side of the natural tooth B. Next, an epoxy resin material is poured into the empty pulp cavity 4 to form a pulp model 5, and a prepared guide 8 is fitted into the pulp extraction hole 7. This guide 8 also serves to accurately position the artificial tooth pulp in each negative mold, which will be described later, at the same position as the pulp of a natural tooth. Good results can be obtained by encircling the apical hole 6 with wax or the like to prevent the epoxy resin material injected inside from flowing out. Next, using the natural tooth B that has completed the above-mentioned work process as a prototype, an upper mold 10 and a lower mold 1 are used.
A negative mold C is created centering on the crown part 2 consisting of 1. Next, the enamel constituting the crown part 2 of the natural tooth B that has completed the above-mentioned work process is dissolved using a weak acid of 2% nitric acid, 8% alcohol, and 90% water, and the dentin of the natural tooth B is dissolved. After the exposure work is completed, a negative mold C' of the dentin is prepared.

In this work, if the natural tooth B to be used is a natural tooth B whose tooth root 3 has a membrane number, such as a first molar, a second molar, or a sixth molar, as shown in Fig. 5. If the lower mold 11 of the negative mold C is divided into two parts with the guide 8 as the center and used in combination with the lower mold 11', the tooth root 6 can be easily molded by dividing each into the lower molds 11 and 11'. . Next, the dentin of the tooth root 3 of the natural tooth B is mixed with, for example, 20% nitric acid and 8% alcohol.
If it is dissolved with a strong acid containing 72% water, the internal dental pulp model 5 will remain and the guide 8 will also remain at the same time. Next, as shown in FIG. 8, using the remaining dental pulp prototype 5, the negative mold is produced in the same manner as the previous negative mold.
A negative mold σ2 for the dental pulp and six types of negative molds are prepared. Next, in the second step, a soft synthetic resin material such as silicone, soft polyurethane material, etc.
An artificial dental pulp 5 is molded by injecting a soft vinyl chloride material.

In this case, if a dentin-colored synthetic resin material is injected into the guide 8, dentin having a pulp can be formed at the same position as the natural tooth. Next, the artificial pulp 5' is positioned and fixed in the negative mold C' for the tooth root using the guide 8, and
A tooth root 6 of the artificial tooth body 1 is molded by injecting a dentin-colored synthetic resin material. Further, as described above, the guide 8 is molded from a dentin-colored synthetic resin material, so it forms the tooth root portion 3 integrally with the dentin-colored synthetic resin material that molds the tooth root portion 6.
.

So you won't feel any discomfort. Next, the artificial tooth main body 1 that has undergone the above steps is inserted and fixed into a negative mold C for the crown part, and a synthetic resin material mixed with an inorganic filler such as silica is injected to form the crown part 2. After curing, the artificial tooth A for training is completed by removing it from the negative mold C and cutting the protruding guide 8. In addition, if a transparent material is used as the synthetic resin material to be injected, the structure of the dental pulp can be observed by looking through the crown and root of the artificial tooth A for training as shown in Figure 1(b) of the attached drawing. This course is unique in that it allows visual training in treatment techniques such as gingival therapy cutting, pulp extraction, root canal treatment, root canal formation, and root canal filling. Further, the synthetic resin material used is not limited to epoxy resin, and it is of course within the technical scope of the present invention to use polyester, polyurethane, etc., if necessary.

(Effects of the Invention) As explained above, the artificial teeth for training of the present invention and the method for manufacturing the same can be applied to natural fibers such as cotton, silk, linen, etc. and various artificial fibers such as epoxy resin wax etc. A method of manufacturing an artificial dental pulp by using an artificial dental pulp coated with or impregnated with a shape-retaining agent, or by using tooth moldings made of soluble metal and injecting polyester resin into the moldings. is fundamentally different, in that the pulp is extracted from a freely selected natural tooth, and a soft synthetic resin material is injected into the empty space to form an artificial pulp model. An artificial tooth pulp that is exactly the same as a complex and minute natural tooth pulp can be obtained, and the artificial tooth pulp is made by dissolving the crown and root of the natural tooth using weak acid and strong acid treatment, respectively, and then molding them using negative molds adapted to each. Insert and fix the teeth inside, and then inject and mold the root and crown parts of the tooth with synthetic resin material to manufacture artificial teeth for training.In addition to practical training in dental treatment techniques, the crown and root parts of the teeth can also be used for practical training. This is extremely effective because it allows practical training in treatment techniques such as touching, removing defective parts, and repairing defects using artificial teeth that have the same internal structure as natural teeth. Furthermore, by making the synthetic resin material transparent, it has the effect of allowing visual inspection of each practical training treatment from the outside, making it possible to carry out more advanced practical training compared to the use of conventional artificial teeth. It has the following characteristics. Although specific embodiments of the present invention have been described in detail above, the present invention is of course not limited to these embodiments, and may be modified in various ways without departing from the spirit of the present invention. It's something you get.

[Brief explanation of the drawing]

FIGS. 1(a) and 1(b) are side views of an artificial tooth for training according to the present invention, and FIG. 2 is a longitudinal sectional view of a natural tooth used as a prototype. FIG. 3 is a longitudinal sectional view showing a state in which a synthetic resin material is injected into the pulp cavity after pulp extraction. Figure 4 is a longitudinal cross-sectional view of the crown-shape. FIG. 5 is a perspective perspective view showing another embodiment. Figure 6 is a longitudinal cross-sectional view of the tooth root shadow type. Figure 7 (Is a side view of the dental pulp prototype.
The figure is a longitudinal cross-sectional view of a pulp-negative type. FIG. 9 is a longitudinal sectional view showing the state in which the tooth root is molded. FIG. 10 is a longitudinal cross-sectional view showing a state in which a tooth crown is molded.

Claims (6)

[Claims] (1) The pulp of a freely selected natural tooth is extracted, a synthetic resin material is injected into the pulp cavity, a prototype of the artificial pulp is formed, and a negative mold of the crown of the same natural tooth is created. , create a negative mold for each with the dentin sequentially dissolved, and use the same negative mold to sequentially inject synthetic resin material into the artificial tooth pulp and the tooth root.
An artificial tooth for training, characterized by a molded crown. (2) The crown of a freely selected natural tooth is extracted, a synthetic resin material is injected into the cavity of the tooth, a prototype of the artificial pulp is formed, and a negative mold of the crown of the same natural tooth is created. A negative mold is made by sequentially dissolving the tooth tissue and dentin using weak acid and strong acid treatment, and using the same negative mold, synthetic resin material is sequentially injected into the artificial tooth pulp to remove the root and crown of the tooth. A method for manufacturing artificial teeth for training, which is characterized by molding. (3) An artificial tooth for training according to claim 1, item 2, characterized in that a synthetic resin phase injected into a negative mold is used to mold the crown and root of the tooth, and its manufacture. Law. (4) An artificial tooth for training according to claim 1, item 2, characterized in that an inorganic filler is mixed into the synthetic resin material injected into the negative mold in order to mold the crown and root of the tooth. and its manufacturing method. (5) The artificial tooth for training and its manufacturing method as set forth in claim 1 or 2, characterized in that the artificial tooth pulp is molded using a silicone material. (6) The artificial tooth for training and its manufacturing method as set forth in claim 1 or 2, characterized in that the artificial tooth pulp is molded using a soft synthetic resin material.