JPH058014B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a denture base provided with a lining material having rubber elasticity and a method for manufacturing the same.

<Conventional technology> Conventionally, in order to provide stable and strong support to the alveolar ridge and prevent wobbling during mastication, involuntary tenderness, and falling off, rubber elastic or flexible lining materials have been attached to the denture base body. It is known that it adheres to the alveolar ridge contact surface. As the material for such backing material, soft fluororesin is used (Japanese Patent Application Laid-Open No. 1983-1999).
No. 21919), those using collagen (Special Publication No. 1987),
-50498), those using silicone rubber (Japanese Patent Application Laid-Open No. 58-54946), those using natural rubber and isoprene polymer (Japanese Patent Application Laid-open No. 55-26923), styrene,
There is one that uses a butadiene-based thermoplastic elastomer (Utility Model Application Publication No. 101622/1983).

<Problems to be Solved by the Invention> When the above-mentioned materials are used as the lining material, the following problems occur.

In the case of soft resin, it is not suitable for maintaining attachments because it does not have rubber elasticity, and when it is deformed by localized pressing force, it does not have the same resilience as rubber.

If the thin sheet is pressed against the mucosal surface of the denture base, it is difficult to fill the undercut portion of the natural tooth, and sufficient retention force cannot be obtained.

Since silicone rubber is a vulcanized rubber, it is difficult to modify it once it has been vulcanized and molded.

Since the plasticizing temperature and vulcanization temperature are considerably higher (about 200°C or higher is required) than the temperature used in conventional techniques (approximately 130°C at most), a special heating device is required.

The present invention has been made in view of these circumstances, and by using a new thermoplastic elastomer as the lining material, it is possible to create a lining that is easy to mold and modify without the need for special machinery. This material was realized.

<Means for solving the problems> In the denture base according to the present invention, the lining material is composed of an olefin thermoplastic elastomer, and the elastomer is fixed to the denture base surface via an adhesive layer. be done.

Moreover, the denture base manufacturing method according to the present invention includes the following steps. First, an olefin-based thermoplastic elastomer is sandwiched between a plaster mold having the shape of a denture base lining material, heated in a liquid or gas atmosphere at approximately 50°C to 130°C, and the plaster mold is pressed to form an olefin-based thermoplastic elastomer. A lining material made of thermoplastic elastomer is molded. Next, an adhesive layer is formed by placing an adhesive sheet or applying an adhesive on the surface of the molded backing material, and polymethyl methacrylate (hereinafter referred to as
PMMA) powder is mixed with liquid methyl methacrylate (hereinafter referred to as MMA) monomer, PMMA is filled into a rice cake shape, and both are pressed together.
Place in hot water at ℃ to 130℃ or in a steam atmosphere. In this way, the rice cake-like PMMA is polymerized and solidified, and at the same time, the lining material is fixed.

<Example> Fig. 1 shows an example of the case where it is adopted as a complete denture 34, in which 5, 5... are artificial teeth, 20 is a denture base body made of PMMA, and 16 is made of olefin thermoplastic elastomer. This lining material 16 is applied to the entire surface of the denture base body 20 facing the alveolar ridge mucosal surface to a predetermined thickness of approximately 0.5 mm to 1.5 mm.

Based on FIGS. 2A to 2J, the denture base according to the embodiment of the present invention will be explained in the order of manufacturing steps.

(A) A jaw model 1 obtained by taking an impression from a patient is formed using plaster 3 in a first flask 2. Wax 4 is piled up on this jaw model 1 and shaped into the shape of a denture base. On this wax 4, artificial teeth 5 are arranged.

(B) After applying a separating agent to the surface of the plaster mold of the first flask 2, the second flask 6 is placed on top of this, and the plaster 7 in a fluid state is poured into it.

(C) After the plaster 7 has solidified, the first and second flasks 2 and 6 are placed in a stacked state in a container 8 and immersed in hot water at about 100° C. for about 5 minutes. This pair of flasks 2 and 6 are then divided,
The wax 4 is removed by washing with hot water.

(D) Wax 9 is raised so as to cover the jaw model 1 of the first flask 2. This thickness is approximately
It is approximately 0.5 mm to 1.5 mm, but in areas where the gums are thin, a thicker layer is applied. This wax 9 corresponds to the lining material forming portion.

(E) After applying a separating agent to the plaster mold surface of the first flask 2, stack the third flask 10 on top of it,
Plaster 11 in a fluid state is poured.

(F) After the plaster 11 has solidified, the first and third flasks 2 and 10 are placed in a container 12 while stacked on top of each other, and immersed in hot water at about 100° C. for about 5 minutes.
Thereafter, the pair of flasks 2 and 10 are separated, and the wax 9 is removed by washing with hot water.

(G) Burr groove 1 around jaw model 1 of first flask 2
3 is engraved, and the first flask 2 and the third flask 10 are superimposed. At this time, a sheet or block of olefin thermoplastic elastomer 1 is placed between the plaster molds of the flasks 2 and 10.
4 is held in place. Here, as the olefin-based thermoplastic elastomer 14, for example, Tafmer (registered trademark, manufactured by Mitsui Petrochemical Co., Ltd.), which exhibits plasticity at around 50° C., can be used.

(H) The first and third flasks 2 and 10 are approximately 50
heated for about 5 to 10 minutes in a container 15 containing hot water or steam at a temperature of 130°C to 130°C;
It is compressed. Alternatively, a method may be used in which only the olefin thermoplastic elastomer 14 is heated in the container 14, taken out and sandwiched between the flasks 2 and 10, and then pressure-molded immediately after. As a result, the olefin thermoplastic elastomer 14 is softened and flows along the plaster mold, and is molded into a predetermined lining material.

(I) Divide the first and third flasks 2 and 10.
At this time, the molded lining material 16 made of olefin thermoplastic elastomer is held on the jaw model 1 of the first flask 2. Lining material 16
An adhesive layer 17 is formed on the surface. This adhesive layer 17 can be obtained by placing an adhesive film on the jaw model 1 or by applying an adhesive to the surface of the jaw model 1. This adhesive layer 17
As the material, an ethylene/vinyl acetate copolymer (hereinafter referred to as EVA) film or solution is used. As such EVA, for example, Evaflex (registered trademark, manufactured by Mitsui DuPont Polychemicals Co., Ltd.) can be used. PMMA powder was mixed with liquid MMA monomer and made into a rice cake shape in the denture base forming area of the second flask 6.
Filled with PMMA18.

(J) Place the first and second flasks 2 and 6 in a pressed state into a container 19 containing hot water or steam at approximately 100°C to 130°C, and heat this to polymerize and solidify PMMA 18. Denture base body 2
0, and at the same time, the denture base body 20 and the lining material 16 are fixed together.

In the above examples, the case where hot water or steam at about 50°C to about 130°C was used as the plastic atmosphere for the olefin thermoplastic elastomer was explained, but this can be easily obtained using a normal pot or pressure cooker. There are advantages. However, instead of such a hot water or steam atmosphere,
Hot air or hot wire can also be used. In such a case, it is necessary to directly apply hot air or hot rays to the olefin thermoplastic elastomer 14 with the first flask 2 open, and the surrounding atmosphere may be air or an inert gas such as nitrogen or argon. can. When a liquid is used, ethylene glycol, polyethylene glycol, polypropylene glycol, glycerin, etc. can be used in addition to water.

EVA used in the above examples has extremely good adhesion to both PMMA and olefinic thermoplastic elastomer, and is suitable as an adhesive for both. The present inventor has developed the above-mentioned EVA as an adhesive material between PMMA and an olefinic thermoplastic elastomer.
In addition, substances prepared by mixing EVA with an olefin thermoplastic elastomer and adding a crosslinking agent, chlorinated synthetic rubber, substances prepared by adding a crosslinking agent to chlorinated synthetic rubber, and chlorinated polyolefin resins. It has been confirmed that one substance or a substance obtained by mixing two or more of these substances has strong adhesive properties. In addition, benzoyl peroxide and dikyumene peroxide can be used as the crosslinking agent added to the above substance, and these cause a crosslinking reaction within the adhesive material and at the same time bond with PMMA and the olefin thermoplastic elastomer that is the backing material. A crosslinking reaction occurs between the two, contributing to improving adhesive strength.

3A and 3B show a partial denture 21, in which the lining material 16 has protrusions 22, 22 at both ends, which elastically contact the undercuts of the adjacent natural teeth 23, 23. come into contact with 20 in the figure is
The denture base made of PMMA, 5, is an artificial tooth.
32 is the alveolar ridge.

FIG. 4 shows an example in which studs and attachments 24 are used, in which 25 is a metal stud fixed to the root 26, 16 is a lining material, and the attachment female 27 is used during molding of the lining material 16. , formed at the same time. 28 is a gingival part.

FIG. 5 shows an example of the attachment 29, in which 30 is a metal mail and is fixed to the natural tooth 23. Reference numeral 16 denotes a backing material, which is a female mail 31 that elastically holds the mail 30.
is integrally molded with this lining material 16 at the same time. A metal ring 33 fixed to the artificial tooth 5 extends from the female mail 31, and the mail 30 engages with this metal ring 33. 2
2 is a protrusion formed on the lining material 16, which extends from the right and left of the attachment 29 to the natural teeth 2.
Two pieces are provided so as to come into contact with the undercut No. 3.

<Effects of the invention> According to the present invention, the following effects can be obtained.

As the lining material is an olefin thermoplastic elastomer that can be molded in hot water or steam at a temperature of about 50°C to about 130°C, it can be molded in hot water or steam using conventional techniques. I can do it. Therefore, a lining material of any shape can be easily created.

Since the lining material can be formed into any shape, it is possible to form not only the lining material for complete dentures, but also the female attachments such as the Darbo attachment and the stud attachment, all in one piece and at the same time. Become. The above-mentioned female mail elastically supports and fixes the mail part using the rubber-like elasticity of the lining material, so there is no risk of its supporting function decreasing.On the contrary, it absorbs the impact applied to the denture, which reduces the burden placed on the alveolar ridge. can be reduced.

Since the lining material has rubber elasticity, its adhesion to the alveolar ridge mucosa is soft, and strong attachment force is obtained due to the suction effect, thereby achieving stable support for the denture.

The lining material is molded on the jaw model formed in the first flask, and then the denture base is polymerized and molded with this lining material placed on the jaw model, so the shape of the lining material, You can freely set the thickness etc.
Moreover, there is almost no possibility that an error will occur between the shape and the shape of the alveolar ridge attachment surface.

Since the adhesive strength between the denture base body and the lining material is strong, the lining material will not peel off even if occlusal pressure is repeatedly applied during mastication.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a denture base according to an example;
2A to 2J are cross-sectional views showing the manufacturing method according to the embodiment of the present invention in the order of steps, FIG. 3A is a top view showing one shape of a partial denture formed by the method of the embodiment, and FIG. B is a cross-sectional view of FIG.
The figure is a sectional view showing another shape, and FIG. 5 is a sectional view showing still another shape. 1... jaw model, 2, 6, 10... flask,
3,7,11...Gypsum, 4,9...Wax, 5
... Artificial tooth, 14 ... Olefin thermoplastic elastomer, 8, 12, 15, 19 ... Container, 16
... Backing material, 17 ... Adhesive layer, 18 ... PMMA,
20... Denture base body, 21... Partial denture, 2
2, 22... protrusion, 23... natural tooth, 24...
Stud attachment, 29...Darbo attachment, 34...Complete denture.

Claims (1)

[Scope of Claims] 1. A denture base body made of polymethyl methacrylate resin, and a lining material having rubber elasticity adhered to the surface of the denture base body facing the alveolar ridge mucosal surface. In the denture base, the above-mentioned lining material is
It is composed of an olefin-based thermoplastic elastomer, and the elastomer is fixed to the surface of the denture base via an adhesive layer, and the adhesive layer is made of ethylene/vinyl acetate copolymer, ethylene/vinyl acetate copolymer, etc. A material prepared by mixing an olefinic thermoplastic elastomer and adding a crosslinking agent to
A denture comprising one or more adhesive substances selected from the group consisting of chlorinated synthetic rubber, a substance prepared by adding a crosslinking agent to chlorinated synthetic rubber, and chlorinated polyolefin resin. floor. 2. A method for manufacturing a denture base including the following steps: a. A step of mounding wax in the shape of a denture base on a jaw model made of plaster in a first flask, and arranging artificial teeth on the wax; b. A step of superimposing a second flask on the first flask and filling the second flask with gypsum in a fluid state; c. After the filled gypsum has solidified, melt the wax in hot water and combine the two flasks. dividing the flask and removing the wax; d applying wax to a desired thickness on the jaw model of the first flask; e superimposing a third flask on the first flask; Filling the third flask with gypsum in a fluid state; f After the filled gypsum has solidified, melting the wax in hot water, dividing the pair of flasks, and removing the wax. Step; g Step of sandwiching the olefinic thermoplastic elastomer between the first and second flasks; h The pair of flasks are heated and compressed in a liquid or gas atmosphere at approximately 50°C to 130°C. Step; i The above-mentioned pair of flasks are divided and the surface of the lining material made of olefin-based thermoplastic elastomer formed into the above-mentioned jaw model is coated with ethylene/vinyl acetate copolymer, ethylene/vinyl acetate copolymer and olefin-based heat. A substance prepared by mixing a plastic elastomer and adding a crosslinking agent, a chlorinated synthetic rubber, a substance prepared by adding a crosslinking agent to a chlorinated synthetic rubber, and a chlorinated polyolefin resin. Alternatively, an adhesive layer composed of a plurality of adhesive substances is formed, and polymethyl methacrylate powder is kneaded with liquid methyl methacrylate monomer to form a cake-like polymethyl methacrylate in the denture base forming area of the second flask. Step of filling acrylate; j Pressing the first and second flasks together,
A step of heating in hot water or steam at 100° C. to 130° C. to polymerize and solidify the polymethyl methacrylate to form a denture base body, and at the same time fixing the denture base body and the lining material.