JPH1185009A - Production of marrow cavity model - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a process for producing a marrow cavity model having precision useful for training for extirpation of the pulp, etc. SOLUTION: This process for producing the marrow cavity model consists of steps of cutting an extracted tooth into two along the extension direction of the marrow cavity (B), impressing the respective two cut marrow cavities (C), adding a fine line 13a for simulating the lost front end part to the front end part of the impression of the impression described above when this front end part is lost at the time of the cutting described above (D) and restoring the impressed marrow cavity in a transparent resin (E).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a dental pulp cavity model used for training a dentist.

[0002]

2. Description of the Related Art Conventionally, a surgical treatment called pulpotomy, which removes the pulp inside a tooth over the entire crown and root, has been employed. Pulp tissue is structurally naturally transitioned from the crown to the apex, and considering the prognosis of the wound after removal of the pulp, the pulp is removed from the crown to the narrowest part of the root canal where the cut surface is minimized. It is desirable to do. For this reason, knowing the working length from the crown to the root canal stenosis is the key to successful extraction. The measurement of the working length is performed using, for example, a measuring instrument such as Justy which is commercially available from Yoshida Corporation as a fully automatic root canal length measuring instrument.

[0003] Although there is no great conjecture about the length of removal of the pulp tissue described above, there is great disagreement over the width of removal. One theory is that a large area, including a significant portion of the dentin around the root canal, is removed to prevent the development of remnant myelitis due to residual dental pulp tissue.
Another theory proposed by the present inventors is that the removal target should be kept to the minimum.

[0004] As the present inventor claims, minimizing the object to be removed requires a higher degree of skill in removing the pulp in order to prevent the occurrence of residual myelitis due to residual removal of the pulp tissue. Conventionally, a dental pulp cavity model has been manufactured for training of a dental student or a dentist in the removal of a pulp. This conventional dental pulp cavity model is manufactured by embedding a fine wire such as a metal wire or a piano wire simulating the pulp cavity in a resin such as transparent acrylic resin, and then pulling out the fine wire from the resin after the resin is cured.

[0005]

The above-mentioned conventional pulp cavity model merely simulates the pulp cavity. For this reason, there is a lack of precision which can simulate the complexity of the actual dental pulp cavity, and there is a problem that it is insufficient for training of a pulpotomy operation including measurement of an operation length. Accordingly, an object of the present invention is to provide a method of manufacturing a dental pulp cavity model having precision useful for training of a pulpotomy operation or the like.

[0006]

A method of manufacturing a dental pulp cavity model according to the present invention, which solves the above-mentioned problems of the prior art, comprises cutting an extracted tooth into two along the extension direction of the dental pulp cavity, and cutting the extracted tooth into two. Impression of each of the pulp cavity that was made, if the tip portion of the pulp cavity was lost during the cutting, add a thin line to the tip portion of the impression to simulate the lost tip portion, The impression pulp cavity is configured to be restored in the transparent resin.

[0007]

According to a preferred embodiment of the present invention, the crown portion of the extracted tooth used for manufacturing the dental pulp cavity is mounted on the impression of the pulp cavity restored in the transparent resin.

[0008]

FIG. 1 is a view for explaining a method for manufacturing a dental pulp cavity model according to an embodiment of the present invention. First,
As shown in the perspective view of FIG.
Prepare 0. Next, by moving the ultra-thin diamond disk in the extension direction of the pulp cavity, the extracted tooth 10 is moved along the extension direction of the pulp cavity as shown in a sectional view (B).
Cut into two parts 11,12. Pulp cavity 11a, 12
Since the extension direction of a exists on a complicated curved surface, this cutting requires considerable skill.

[0009] Next, for each of the cut pulp cavities, a well-known impression using wax, resin, soft metal, or the like is performed to obtain a metal mold of the pulp cavity as shown in (C). 13 is created.

The problem here is that the thin portion of the tip of the pulp cavity is lost due to the thickness of the diamond disk used in the cutting operation (B) and the hand movement of the operator during the cutting operation. Therefore, the metal mold 13 shown in FIG.
Is naturally lost. This metal mold 1
The narrow part at the tip of the pulp cavity, which is lost from 3, also includes the root canal most narrowing part, which is extremely important in knowing the working length from the crown. This is because the typical inner diameter of the root canal stenosis has an extremely small size of about 0.08 mm, which is about the thickness of hair.

Therefore, as shown in FIG. 2D, in order to simulate the distal end portion including the root canal stenosis lost during the cutting operation, a thin wire 13a, such as a wire or a piano wire, having rigidity and strength is used. 13b is added. Next, as shown in FIG. 2 (E), the metal mold 13 of the pulp cavity with the added tip is
It is embedded in a transparent square epoxy resin 14 leaving its top. After the epoxy resin 14 is solidified, the metal mold 13 of the pulp cavity is pulled out of the epoxy resin 14 to obtain a model of the pulp cavity impressed in the epoxy resin 14 as shown in FIG. Create 15.
Tip portions 15a and 15b simulated using fine lines are formed at the tip of the pulp cavity model.

Finally, as shown in FIG. 3 (G), a vermilion oil-soluble dye is applied to the inner wall surface of the dental pulp cavity impressed in the transparent epoxy resin 14, and then a model of the dental pulp cavity is formed. The dental pulp cavity model is completed by attaching the crown portion 16 of the extracted tooth used for the preparation.

When this dental pulp cavity model is used for training on how to use a root canal length measuring instrument such as Justy, the canopy of the crown 16 is removed, and the root canal is filled with physiological saline. An electric path is formed between the distal end portion of the dental pulp cavity and the root canal narrowest portions 17a and 17b connected to the distal end portion of the dental pulp cavity 15 from the surface of the epoxy resin as shown in FIG. .

When used for pulpal removal surgery, the crown 1
After removing the canopy from 6, the hand file is inserted into the pulp cavity, and the working length up to the root canal stenosis is determined using a root canal length measuring instrument such as Justy. The pulp tissue may be scraped off by matching the hand file to the determined working length. At this time, the remaining portion of the pulp tissue removed becomes apparent at a glance by the inner wall of the pulp cavity which is colored red.

The configuration for cutting the extracted tooth using the diamond disk has been described above. However, the extracted tooth may be cut using another appropriate cutting tool such as a laser knife instead of the diamond disk.

[0016]

As described above in detail, the method of manufacturing a dental pulp cavity model according to the present invention is characterized in that the extracted tooth is cut into two along the extension direction of the dental pulp cavity, and the cut pulp cavity is cut into two. It is configured to restore each impression of the dental pulp cavity in transparent resin, so it has precision that can simulate the complexity of the actual dental pulp cavity, measurement of working length etc. It is extremely useful for training of endodontics including.

Further, according to the manufacturing method of the present invention, a thin line for simulating the distal end portion including the lost most constricted portion is added to the distal end portion of the impression with respect to the distal end portion of the pulp cavity lost during cutting. Since it is a configuration, it is extremely useful for training of endodontics including measurement of working length up to the most stenotic part.

[Brief description of the drawings]

FIG. 1 is a drawing for sequentially explaining first steps of a method for manufacturing a dental pulp cavity model according to an embodiment of the present invention.

FIG. 2 is a drawing for sequentially explaining intermediate steps of the manufacturing method of the above embodiment.

FIG. 3 is a drawing for explaining a final step of the manufacturing method of the embodiment in order.

FIG. 4 is a view showing a state in which a continuous hole is opened in a tip portion of the dental pulp cavity model manufactured according to the embodiment.

[Explanation of symbols]

10 Extracted tooth 11,12 Extracted tooth bisected along the direction of extension of pulp cavity 11a, 12a Pulpal cavity 13 Metal mold impressed from pulp cavity 13a, 13b To simulate the tip lost during cutting Thin line added to the tip of the mold 14 Transparent epoxy resin 15 Dental pulp cavity restored in transparent epoxy resin 16 Crown placed above the restored pulp cavity

Claims (2)

[Claims] 1. The extracted tooth is cut into two along the extension direction of the pulp cavity, and each of the two cut pulp cavities is impressed, and the tip of the pulp cavity is lost during the cutting. in case of,
A method for manufacturing a dental pulp cavity model, comprising: adding a thin line to the distal end portion of the impression to simulate the lost distal end portion; and restoring the impressed dental pulp cavity in a transparent resin. 2. The method for manufacturing a dental pulp cavity model according to claim 1, wherein a crown portion of the extracted tooth used for manufacturing the dental pulp cavity is mounted on an impression of the dental pulp cavity restored in the transparent resin. .