JPH0422729Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a molding material for use in manufacturing a denture base by compression molding using a thermoplastic resin as a material.

[Conventional technology and its problems]

It is known to produce denture bases made of thermoplastic resin by compression molding. Regarding the shape of the material used for molding, Utility Model Application Publications No. 59-100409 and Utility Model Application Publication No. 60-88911 disclose a shape that approximates a dental arch.

However, when using the material disclosed in Japanese Utility Model Application Publication No. 59-100409, which has a U-shape similar to a dental arch and has a plate-like cross section, the compression molding method for thermoplastic resin
Since the thermoplastic resin is placed and heated to soften, the softened thermoplastic resin loses its shape and easily comes off from the predetermined position of the plaster mold, so a high degree of skill is required in the subsequent process. In addition, in Utility Model Application No. 60-88911, in order to prevent the above-mentioned deformation, the material shape of the thermoplastic resin was changed to U.
Improvements are being made by changing the letter-shaped cross section to a chevron shape. However, Utility Model Application No. 60-88911 and Utility Model Application No. 59-100409
In the method of No. 1, the shape of the thermoplastic resin material is integrally molded into a U-shape that approximates a dental arch, or a plate-like shape with a thick wall portion that approximates a dental arch on the periphery, so it can be made into a shape that is large or small or wide or narrow. In order to accommodate each person's dental arches, which have a variety of shapes, it is not only necessary to produce a large number of molds for the production of denture base molding materials, but also to It is necessary to prepare a shaped thermoplastic resin, which imposes an extremely large economic burden.

On the other hand, in order to reduce the economic burden, if the types of denture base molding materials are reduced, it will not be possible to accommodate the various shapes of dental arches, and it will be necessary to prevent the thermoplastic resin from losing its shape when softened. Even if a material with a chevron-shaped shape is used, it is not possible to prevent the material from losing its shape, and a complicated and sophisticated technique is required to adjust the shape of the softened resin before compression molding.

In addition, in order to accommodate many dental arch shapes with a small number of shapes, a large amount of thermoplastic resin is used to make a large denture base molding material, which expands the range of applicable dental arch shapes. This will lead to the destruction of the plaster mold.

[Means for solving problems]

The present invention relates to a denture base molding material for molding a good denture base that improves the above-mentioned drawbacks. That is, the denture base molding material is provided with a plurality of broken parts that can be easily divided, and the material is broken into pieces according to the dental arch of each person. By combining thermoplastic resin molded products, it is possible to accommodate dental arches of various shapes with a small amount of material.

According to the present invention, a thermoplastic resin molded product for denture base molding is formed by combining a plurality of thermoplastic resin molded products having a chevron-shaped cross-sectional shape, and the combined shape is U-shaped approximating a dental arch. A resin material is provided.

The feature of the present invention is that the denture base molding material with multiple fractured parts is broken and divided into several parts (components). The point is that the arch is divided into three parts, and the divided thermoplastic resin molded parts are combined into a shape that corresponds to each person's dental arch. The number of divisions is not particularly limited and may be two or more, but three is preferred.

The depth and shape of the broken part are not particularly limited, as long as it has enough connection strength to maintain the overall shape and can be easily broken.

The cross-sectional shape of the material according to the present invention may be substantially mountain-shaped, and for example, there may be a horizontal portion or a corner portion at the top of the mountain.

Embodiment Hereinafter, an example of the present invention will be described based on an embodiment shown in the drawings.

FIG. 1 is a perspective view showing a three-part maxillary material configuration. 1 and 3 are parts that approximate the dental arch of the molar region, and 2 is a plate-like part 11;
A portion that is integrally formed with a portion 12 that approximates a dental arch of the front teeth, and these are connected and connected by connecting connecting portions 7 and 8, and the cross section as a whole approximates a dental arch that is chevron-shaped. It constitutes a thermoplastic resin molded product with a shape.

Here, the joint connecting parts 7 and 8 are the molded products 1 and 2.
and 3 are connected with such strength that they can be easily broken and divided.

FIG. 2 is a perspective view showing the three-part material configuration for the mandible. As in FIG. 1, numerals 4 and 6 are parts that approximate the dental arches of the molars, and 5 is a part that approximates the dental arches of the anterior teeth. Incidentally, the coupling and connecting portions are the same as in FIG. 1.

Next, the thermoplastic resin used is one that does not deteriorate due to heat during molding, has an appropriate viscosity, has good moldability, and can be colored to resemble the color of the gums. The resin is required to have appropriate rigidity and moisture resistance, as well as toughness that does not cause stress cracks during use. Therefore, polystyrene, polymethyl methacrylate, polymethyl pentene-1, transparent polyamide, polyethylene terephthalate, polycarbonate, polyarylate, polyester carbonate, transparent ABS
Resins, polysulfone resins, etc. are used, and polysulfone, polyethersulfone, etc. are particularly preferred because they are excellent in moisture resistance, rigidity, stress cracking resistance, etc.

In addition, the shape of the material of the present invention is not limited to the shape shown in the illustrative figure, but can also be used to create a suitable shape for a denture base molding material that approximates a dental arch by combining multiple pieces of material obtained by fracture. That's fine.

[Effect of idea]

As explained above, in the denture base molding material of the present invention, a thermoplastic resin molded product having a chevron cross-sectional shape is provided with a plurality of fractured parts, and a plurality of partial materials obtained by fracture are appropriately divided. When used in combination, it is possible to obtain a U-shaped material that approximates any dental arch. Therefore, regardless of the size or width of the dental arch, it can be easily placed on a plaster model, and its shape will not deteriorate when the thermoplastic resin softens. In addition, even if the amount of resin changes depending on the size of the dental arch and the degree of resorption of the alveolar ridge, it is easy to change the denture base material by changing the shape of the multiple resin molded products obtained by fracture and combining them as appropriate. It has the advantage that it can be adapted to various shapes of dental arches with fewer material shapes (fewer molds). Furthermore, when a thermoplastic resin denture base is molded using the material of the present invention, a good denture base can be molded without the need for any complicated operations after the resin has been softened, and without causing insufficient resin or cracking of the plaster mold. .

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the shape of a material for the upper jaw consisting of three members, and FIG. 2 is a perspective view showing the shape of the material for the lower jaw consisting of three members. 1, 3, 4, 6... Thermoplastic resin molded product which is a part similar to the dental arch of the molar region, 2... Plate-shaped part 1
1 and a portion 12 that approximates the dental arch of the front teeth, a thermoplastic resin molded product 5...
...A portion of the front teeth that approximates the dental arch, 7, 8...Connection joints.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A denture base molding material made of a thermoplastic resin molded product having a U-shape similar to a dental arch and a chevron-shaped cross section, with a cut for breaking. . (2) Registration of a utility model in which a thermoplastic resin molded product is provided with a notch that can be broken into a molded product with a shape approximating the dental arch of the anterior teeth and a molded product with a shape similar to the dental arch of the molar teeth. A denture base molding material according to claim (1).