JPS59186551A - Production of model tooth - 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 The present invention relates to a method for manufacturing a simulated tooth that can appropriately reproduce the pulp chamber and the root canal connected thereto in a state close to that of a natural tooth.

The applicant has already provided the invention of Japanese Patent Publication No. 58-1428 as a related invention. In this invention, a metal wire is set in a mold to form a tooth shape, and after the molding, it is removed to form a dental pulp cavity. It is good if it consists of the same shape, but since the diameter of the pulp cavity is different depending on the thickness of the wire, the pulp cavity becomes a wide pulp chamber at the crown of the tooth, and a narrow root canal is connected to the pulp chamber. If the tooth appears to be elongated, there is a problem with the lack of reproducibility.

Therefore, the present invention prepares a dental pulp cavity model in which the part corresponding to the pulp chamber is formed by a model made of a soluble substance, and a wire rod for root canal formation is protruded from the model using this as a base, This is used as a core to form a tooth shape, and after removing the mold, the root canal forming wire is removed, and the pulp chamber forming model is eluted using the wire removal hole as an elution hole to form the pulp cavity. The present invention provides a method for manufacturing a simulated tooth that enables molding of the pulp chamber and root canal according to the tooth.

In the figure, reference numeral 1 indicates a dental pulp cavity model used as a core during the tooth mold molding. The pulp cavity model 1 consists of a pulp chamber formation model 2 and a root canal formation wire 3.

The pulp chamber formation model 2 is made of a soluble substance that dissolves in water or a medical solution, etc., and the root canal formation wire 3 pierces the convertible substance and has its sharp end protruded toward the root of the tooth for use in root canal formation. The proximal gold tooth crown gradually thickens and slightly protrudes upward.

Examples of the converting substance for forming the pulp chamber formation model 2 suitable for carrying out the present invention include water-soluble wax that dissolves well in water (including hot water), and as the root canal formation wire 3, needle-shaped Metal @ki is suitable and it is 8.

In addition to metal wires, wires made of glass fiber can also be used depending on the implementation.

The pulp cavity model 1, which is a composite of the pulp chamber formation model 2 and the root canal formation wire 3, can be manufactured by a known molding method.

Fig. 2 shows an embodiment of the present invention. First, a master model 4 of the pulp chamber as shown in Fig. A is made, and using this master model 4, as shown in Figs. A mold 5 (split mold) for the pulp chamber formation model is made using an impression material made of soft plastic, and then a root canal formation wire 3 is placed on one side of the mold 5 so as to cross the entire cavity of the mold. After that, the mold 5 is closed and the soluble substance is poured into the injection port 6.
For FII, a water-soluble substance such as a water-soluble wax is heated and fluidized before being poured. After cooling and removing the mold, the pulp chamber formation model 2 and the root canal formation line vJ as shown in Fig. 1 are formed.
' A composite model of 3, that is, a dental pulp cavity model 1 can be manufactured.

The pulp cavity model 1 is prepared in advance as described above, and the pulp cavity model 1 is set so as to cross the mold cavity of the simulated tooth mold 7 (split mold) as shown in FIG. The entire model 1 is supported in the air by placing or sticking both ends of the wire 3 protruding from the mold cavity into the wall soil that defines the mold cavity).Then, the simulated tooth mold 7 is closed and the pulp cavity is removed. The injection port 8 uses the model 1 as the core.
Inject molten resin (transparent resin) and perform tooth molding.
Wait for it to harden and remove from the mold.

In this way, a simulated tooth blank 9' as shown in FIG. 4 is formed.

Next, the root canal formation wire 3 is removed from the simulated tooth blank 9', and subsequently washed by immersion in salt water to elute the pulp chamber formation model 2 remaining inside. At this time, the extraction hole 10 of the root canal forming wire 3 becomes a warm water inlet hole and functions as an elution hole.

As shown in FIG. 4B, the extraction hole 10 along the line vJ'3 extends long and thin through the tooth, allowing water to pass therethrough. In order to promote this water passage and elution, an ultrasonic cleaning method is applied to the above-mentioned cleaning.

In the manner described above, a simulated tooth 9 in which the pulp cavity 11 is almost faithfully reproduced as shown in FIG. 5 is obtained.

The simulated tooth 9 obtained in this way is ideal as a teaching material for root canal treatment, and since it allows practice in conditions as close as possible to natural teeth, it is a good practice for learning the techniques and techniques of gingival therapy. It can be effective.

If the simulated tooth 9 is molded from a transparent resin, it is possible to practice treatment while observing conditions such as canal grevinsion and canal healing (filling with gutta-percha) in a realistic manner.

Alternatively, as shown in FIG. 4A, the dental pulp cavity model 1 may be used while remaining inside, so that the internal pulp pattern can be clearly observed at a glance.

In this case, it is preferable for the user (mostly a trainee) to remove the wire rod 3 and elute the model 2.

According to the present invention, even in the case of a tooth in which the pulp chamber forms a wide pulp chamber 11a at the crown of the tooth and has a narrow root canal 11b connected to the pulp chamber 11a, this can be accurately reproduced.

[Example 1] is illustrated in a single root canal 11b', but according to the invention, it can also be implemented as a simulated tooth shaping method when the root canal 11b has multiple branches from the pulp chamber 11a.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a side view of a dental pulp chamber model, and FIG. master motel,
Figures 4B and C are cross-sectional views showing a pulp chamber formation model mold using the same model and framed with impression material; Figures A and B show the simulated tooth molding state, the doujin figure is a plan view of the split mold showing the state in which the pulp cavity model is set in the mold, and Figure B is a cross-sectional view of the mold with the mold closed. , Figure 4A is a cross-sectional view of the simulated tooth blank obtained in Figure 3, Figure 4B is a cross-sectional view of the blank with the root canal formation wire removed, and Figure 5 is a completed one. It is a sectional view of a simulated tooth. 1 pulp chamber model, 2 pulp chamber formation model, 3 root canal formation wire, 4 pulp chamber master model, 5 pulp chamber formation model mold,
6 injection port, 7 simulated tooth mold, 8 press inlet, 9' simulated tooth semi-finished product, 9 simulated tooth, 10 line paulownia extraction hole, 11
Pulp cavity, Ila Same pulp chamber, ],, lb Same root canal. Figure 1

Claims (4)

[Claims] (1) forming a pulp chamber formation model with a soluble substance, preparing a pulp cavity model with a root canal formation wire protruding from the pulp chamber formation model, performing tooth molding using the pulp cavity model as a core; A method for manufacturing a simulated tooth, which comprises removing the root canal forming wire after demolding, and eluating the pulp chamber forming model using the wire removal hole as an elution hole to form a pulp cavity. (2) A method for producing a simulated tooth according to the invention described in item 1, characterized in that a water-soluble substance is used as the soluble substance. (3) In the invention described in item 2, the method for manufacturing a simulated tooth is characterized in that a metal wire is used as the root canal forming wire. (4) In the invention described in item 1, the method for manufacturing a simulated tooth, characterized in that the root canal formation wire passes through the pulp chamber formation model and both ends of the wire protrude.