JP5416693B2 - Denture and manufacturing method thereof - Google Patents

Description

  The present invention relates to a denture and a manufacturing method thereof.

Japanese Patent No. 3779530

  Conventionally, for denture users, the impact that occurs when chewing hard food is accompanied by unbearable severe pain. It was. This is mainly because the denture base that is in close contact with the oral mucosa is a hard resin made of polymethylmethacrylate. This is because it is inevitable that a slight gap is generated between the denture base and the oral mucosa when the denture is mounted.

  As one of the measures for eliminating such dissatisfaction, a method is conceivable in which the patient himself purchases a commercially available denture stabilizer and wears a denture applied to the surface in contact with the oral mucosa in the mouth. Although this will surely chew hard food without feeling pain, and a comfortable wearing feeling can be obtained, such an effect lasts only for about 4 to 5 days, and is also troublesome and economical for the patient. Since the burden is large, the fundamental solution has not been reached.

  Under such circumstances, recently, there is an increasing demand for dentures that can be chewed with food comfortably without rattling after wearing. Therefore, in the field of dental technicians, the development of dentures with a polyvinyl silicone resin-based backing material fixed is underway, and some of them have been put to practical use, such as Dentax's Moroplast B (registered trademark). . However, the pain when chewing a hard object is somewhat less than when the denture base touches the oral mucosa directly, and the lining resin is relatively hard, so the pain is not completely eliminated, Since deterioration with time such as discoloration and alteration of the lining material was remarkable, there was still a problem that the life of the denture was short, it was easy to come off and a stable wearing feeling could not be obtained.

  On the other hand, by using biomedical silicone rubber, which is used in the medical field for human substitutes and prosthetics, as a denture lining material, physiological affinity between the denture and the oral mucosa is achieved and a buffering action Although it is expected to prevent rattling of dentures, it has been difficult to secure a sufficient adhesive force. Therefore, at present, development of dentures using biomedical silicone rubber as a backing material has not been realized.

In order to solve such a situation, a denture shown in Patent Document 1 has been proposed.
The present invention can provide a product (denture) obtained by strongly adhering silicone rubber having improved adhesion to an adherend of a denture base by adding methyl methacrylate.
Regarding the mechanism, in the polymerization process of silicone rubber, MMA (methyl methacrylate) that does not mix uniformly with silicone is polymerized in a form that is ejected to the outside, so that PMMA (polymethyl methacrylate) is formed near the surface of the silicone rubber. It was considered that the adhesion to the adherend was dramatically improved since a thin layer of was formed. That is, with the polymerization of silicone containing a small amount of MMA, MMA is polymerized near the surface, so the methyl group of the PMMA layer on the surface of the silicone rubber produced by the polymerization, the denture and the methyl group of the PMMA resin which is this material It was considered that the silicone rubber was firmly bonded to the denture base without using any adhesive because of the van der Waals interaction.
The adhesive force between the denture base and the silicone rubber as the backing material depends on van der Waals force as described above, and does not have a chemical bonding force. Inventors of the present application have thought over the years whether the silicone rubber could be fixed to the denture base with a mechanism different from the invention of Patent Document 1 regarding the adhesive force between the denture base and the silicone rubber as the lining material. .
Further, as in the invention of Patent Document 1, when the MMA solvent enters, the silicone rubber easily accumulates dirt. This is because the surface of the silicone rubber becomes porous (a large number of undulations can be formed on the surface) when the MMA solvent is added.
For this reason, the inventor of the present application has conducted earnest research for the purpose of improving silicone rubber, which is a lining material for a denture base, by a meganism different from that of Patent Document 1.

Moreover, the conventional thing shown by patent document 1 wants that a lining material is all formed in the fixed hardness, and a thing with a softer contact than other positions depending on the position in the mouth. It was not enough to answer the request for the feeling of wearing a denture.

  The object of the present invention is to improve the adhesion of dentures by a mechanism different from that of the above-mentioned Patent Document 1. Moreover, it aims at providing what can improve the mounting | wearing feeling of a denture according to each request.

  In order to solve the above problems, the invention described in each claim of the present application provides the following denture and a method for manufacturing a denture.

（ｍ＋ｎ＝５０〜２０００）で示されるシリコーンにエチレンジメタクリレートを加えてゲル重合させたシリコーンゴムにて形成されたものであり、義歯床の人体への固定面において、第１の裏装材は、第２の裏装材を取り囲むように配置されたものであることを特徴とする。 A first invention of the present application is a denture provided with an artificial tooth, a denture base that supports the artificial tooth and mainly comprises polymethyl methacrylate, and a lining material provided on the surface of the denture base that is fixed to the human body. The following configuration is provided.
That is, as the above-mentioned backing material, at least two kinds of backing materials, a first backing material and a second backing material softer than the first backing material, are provided, and each of the above-mentioned backing materials Are both general formulas

(M + n = 50 to 2000) is formed of silicone rubber obtained by gel polymerization by adding ethylene dimethacrylate to the silicone. On the surface of the denture base fixed to the human body, the first lining material is The second lining material is disposed so as to surround the second lining material.

In the second invention of the present application, in the first invention of the present application, the hardness of the first backing material is 55 to 45 of Asker C, and the hardness of the second backing material is 45 to 15 of Asker C. It is characterized by being.

In the third invention of the present application, in the first or second invention of the present application, each of the above-described silicone rubbers for gel polymerization forming each of the lining materials is an addition curing type of low viscosity LTV. Shi silicone rubbers are those the main agent, to form at least a second backing component, silicone rubber gel polymerization, with respect to the base material by being mixed soft feeling elastomer as modifier, the second back The denture provides a denture characterized by being softer than the first lining material.

According to a fourth invention of the present application, in the invention of any one of the first to third applications of the present application, the second backing material is disposed at a position of the bottom surface of the denture base that contacts the mucous membrane covering the bone crest. Provided is a denture characterized by being.

According to a fifth invention of the present application, in the invention of any one of the first to third applications of the present application, the denture is attached to the upper jaw, and the second lining material is a maxillary nodule on the bottom surface of the denture base or Provided is a denture that is arranged at a position where it comes into contact with a palatal fold.

A sixth invention of the present application is the denture of any one of the first to third aspects of the present invention, wherein the second lining material is a lower alveolar tube on the bottom surface of the denture base. Provided is a denture which is arranged at a position where it comes into contact with the mucous membrane covering the skin.

A seventh invention of the present application is the invention according to any one of the first to sixth applications of the present application, wherein the first backing material and the second backing softer than the first backing material are used as the backing material. And at least three types of lining materials, a first lining material and a third lining material softer than the first lining material and harder than the second lining material. A denture is provided in which the dressing is arranged to surround the second and third back mounting materials.

In the implementation of the first to seventh inventions of the present application, the adhesive force between the denture base (resin) and the silicone rubber as the lining material was remarkably improved by a mechanism different from that of the silicone rubber added with MMA.
Further, since MMA is not required and the solvent is not required, the surface of the silicone is smooth, and the porosity of the surface generated when MMA (solvent) is used is remarkably improved. For this reason, the contamination of the silicone rubber was greatly reduced.
Specifically, unlike the one in Patent Document 1 in which ethylene dimethacrylate is added to silicone and polymerized to add PMMA to the silicone rubber (as a surface layer) by adding MMA, the generated silicone rubber is The component composition is uniformly dispersed, the surface is smooth, and it is firmly fixed to the denture base of PMMA by chemical bonding, not intermolecular force.
As a result, the use of silicone rubber for dentures, which is flexible, has a good fit, has a high affinity with the living body, and has a low burden on the living body, facilitates the long-term use of dentures.
In particular, in the practice of the present invention , by providing two or more types of lining materials with different hardness on the surface of the denture base that is fixed to the human body, the softening of the contact depending on the fixing position according to the request of the denture user. Different dentures were provided.

(A)-(D) are sectional drawings explaining the flow of the manufacturing process of the denture based on this invention. It is sectional drawing which shows an example of the mode in the patient's mouth equipped with the denture based on this invention. It is sectional drawing which shows an example of the mode in the patient's mouth equipped with the denture based on this invention. It is sectional drawing which shows an example of the mode in the patient's mouth equipped with the denture based on this invention. It is sectional drawing which shows an example of the mode in the patient's mouth equipped with the denture based on this invention. (A) is explanatory drawing which shows a 1000 times SEM image of the test piece surface of Example 4 of this invention, (B) is explanatory drawing which shows a 1000 times SEM image of the test piece surface of a comparative example. It is explanatory drawing which shows the 1500 times SEM image of the test piece surface of the said comparative example. (A) is explanatory drawing which shows a 500 times SEM image of the test piece surface of Example 4 of this invention, (B) is explanatory drawing which shows a 500 times SEM image of the test piece surface of a comparative example. It is sectional drawing which shows an example of the mode in the patient's mouth which mounted | wore the denture based on other embodiment of this invention. (A) is a schematic plan view of the upper jaw for explaining the arrangement of the second lining material of the denture according to another embodiment, and (B) is a second view of the denture according to still another embodiment. It is a schematic plan view of the lower jaw explaining the arrangement of the lining material. . (A) is a schematic plan view of an embodiment corresponding to (A) of FIG. 10, and (B) is a schematic plan view of an embodiment corresponding to (B) of FIG. 10. It is sectional drawing which shows 1 process of the manufacturing method of the denture based on embodiment shown to FIG.9 and FIG.11.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. The manufacturing process of the denture of the present invention is shown in FIGS.
1 (A) to 1 (D) are cross-sectional views illustrating the flow of a manufacturing process for a denture according to the present invention. FIG. 2 is a cross-sectional view showing an example of a state in the mouth of a patient wearing the denture according to the present invention. FIG. 3 is a cross-sectional view showing an example of a state in the mouth of a patient wearing the denture according to the present invention. FIG. 4 is a cross-sectional view showing an example of a state in the mouth of a patient wearing the denture according to the present invention.

First, the manufacturing procedure of the silicone rubber according to the present invention will be described. Hydrogen gel polysiloxane having a general formula represented by the following “Chemical Formula 2” as a crosslinking agent and ethylene dimethacrylate may be added to the silicone gel represented by the following “Chemical Formula 1”. After stirring, the mixture is sealed in a polymerization container having a rectangular parallelepiped shape, etc., and left at low temperature or at room temperature.
The hydrogen polysiloxane is added in a ratio of 10% by volume to 100% by volume of silicone gel (total 110% by volume).
The ethylene dimethacrylate is added at a ratio of 0.05 to 1% by volume with respect to 100% by volume of the silicone gel (total 100.05 to 101% by volume / total 110.05 to the above hydrogen polysiloxane). 111% by volume). In particular, ethylene dimethacrylate is preferably added at a ratio of 0.1 to 0.6% by volume with respect to 100% by volume of silicone gel (total 100.1 to 100.6% by volume).
If the amount of ethylene dimethacrylate added to the silicone is less than 0.05% by volume, the peel strength is extremely lowered, and it becomes difficult to fix the silicone rubber to the denture base. On the other hand, when the amount of ethylene dimethacrylate added to the silicone exceeds 1.0% by volume, the silicone rubber becomes too soft to lose its self-supporting property and cannot be used as a backing material.

  As a result, the polymerization (crosslinking) reaction of the silicone proceeded using the platinum compound contained in the silicone as a catalyst, and a silicone rubber test piece having a smooth surface and elasticity was obtained.

（ｍ＋ｎ＝５０〜２０００）

（Ｒはメチル基又は水素、ｋ＋ｌ＝８〜９８）

(M + n = 50-2000)

(R is a methyl group or hydrogen, k + 1 = 8 to 98)

Next, the manufacturing method of the denture which backed the denture base with the silicone rubber which concerns on this invention is demonstrated with reference to FIG.
As shown in FIG. 1A, the following steps are performed on a denture (semi-finished product) including an artificial tooth 100 and a denture base 2 made of PMMA resin (resin) in which the artificial tooth 100 is implanted. .
First, the denture 1 in which the paraffin wax 3 is applied with a predetermined thickness on the surface of the denture base 2 made of PMMA resin on the human body is placed in the lower flask 5 so that the application surface of the paraffin wax 3 is exposed. Secure with gypsum 6. Then, as shown in FIG. 1 (B), while pouring gypsum 6 'serving as a model into the upper space including the application surface of paraffin wax 3, the upper flask 4 in which the lower gypsum layer 7 is hardened in advance is placed below. Cover the flask 5 and leave it for a while to wait until the gypsum 6 'is completely solidified.

  Next, as shown in FIG. 1C, the upper and lower flasks 4 and 5 are opened, and the paraffin wax 3 is washed away with a suitable solvent and removed. Thereby, when the upper and lower flasks 4 and 5 are closed, a space having a shape corresponding to the portion where the paraffin wax 3 was present is secured. Then, the surface of the denture base 2 from which the paraffin wax 3 has been removed is dried.

Then add hydrogen polysiloxane crosslinker (10% by volume with respect to silicone as described above), ethylene dimethacrylate (0.05 to 1.0% by volume with respect to silicone as described above) and platinum catalyst and mix. Silicone 8 is poured from above the denture base 2. Thereafter, as shown in FIG. 1 (D), the upper flask 4 is put on, sealed with a bolt 14, and housed in a pressure cooker (not shown), and is kept at 100 ° C. under a pressure of 1.2 to 3.5 atm. Heat at ~ 130 ° C for about 15-25 minutes. Thereby, the silicone 8 is polymerized and cured into a soft rubber shape so as to match the cavity shape of the portion where the paraffin wax 3 (FIG. 1B) was present.
At this time, the silicone rubber 9 is bonded to the surface of the denture base 2 on the side to be mounted on the human body.

  Then, the upper and lower flasks 4 and 5 are opened again, the denture 1 is dug from the plaster 6 and the surrounding burrs and the like are removed. Thereby, the denture 1 by which the silicone rubber 9 was lined on the surface by the side of the denture base 2 attached to the human body is obtained.

  2-5 is sectional drawing which shows the mode in the patient's mouth which mounted | wore with the denture produced as mentioned above. FIG. 2 is an example in which the entire portion of the denture base 2 that touches the oral mucosa 10 is covered with a silicone rubber 9, and this type of denture is mainly used for teeth that chew hard objects such as lower molars. By doing so, the impact can be greatly reduced.

  3 and 4 are examples in which silicone rubber 9 is lined on a part of the part of the denture base 2 that touches the oral mucosa 10 (part to which direct force is applied), and FIG. FIG. 4 shows the case of the upper front teeth. According to this, since a small amount of silicone rubber 9 is sufficient to reduce the impact transmitted to the oral mucosa 10, the manufacturing cost of the denture can be reduced.

  FIG. 5 shows an example of a denture for a patient in which a part of the maxillary sinus 11 has penetrated to the nasal cavity 12 due to a cleft palate or the like, and the insertion portion 2a of the denture base 2 formed to be inserted into the affected area 13 is shown. Silicone rubber 9 is provided locally. As a result, the affected area 13 is completely covered with the flexible silicone rubber 9 without any gaps, so that air leakage is prevented and sound clarity is ensured, and beverages and the like are prevented from flowing into the nasal cavity 12. Can do.

Next, other embodiments of the backing material will be described.
In the embodiment described above, the backing material having the same hardness is arranged at each position of the bottom surface of the denture base, that is, the surface backing material that contacts the human body. For this reason, the contact of the mounted denture base is uniform at each position in the mouth. For example, only a low viscosity LTV (Low Temperature Vulcanization) addition curing type silicone rubber having a hardness of 55 of Asker C is used as the silicone before gel polymerization (before addition of ethylene dimethacrylate and catalyst). can do. Asker C (ASKER C) is hardness according to the Japan Rubber Association Standard (SRIS), and 55 of Asker C corresponds to hardness 31 according to JIS K 6301 spring type A (JIS TYPE A), and durometer type A (Shore). This corresponds to 30 of A).

（ｍ＋ｎ＝５０〜２０００）で示されるシリコーンにエチレンジメタクリレートを加えてゲル重合させたシリコーンゴムにて形成される点については、上述してきた実施の形態と同様である。
しかし、この実施の形態において、硬さの異なる裏装材を構成するシリコーンゴムに、夫々硬さの異なるものを採用する。
この義歯床において、上記のゲル重合前のシリコーンゴムについて、低粘度ＬＴＶの付加硬化タイプのシリコーンゴムを主剤として用い、必要に応じて、所定量のソフトフィーリングエラストマーを調整剤として混練することにより形成する。この調整剤の量を変えることにより、硬さの異なる二種類以上の、裏装材を形成することができる。 Here, using dentures with two or more different hardnesses, the denture base is softer than the other parts of the mouth for sensitive parts in the mouth, and the dentures have improved wearing feeling. ,explain.
Also in this case, the basic method of manufacturing a denture is the same as that of the above-described embodiment. That is, each of the lining materials includes an artificial tooth, a denture base that supports the artificial tooth and is mainly composed of polymethyl methacrylate, and a lining material provided on the surface of the denture base that is fixed to the human body. General formula in dentures

About the point formed with the silicone rubber which added ethylene dimethacrylate to the silicone shown by (m + n = 50-2000), and was made to gel-polymerize, it is the same as that of embodiment mentioned above.
However, in this embodiment, silicone rubbers having different hardnesses are used as the silicone rubbers constituting the backing materials having different hardnesses.
In this denture base, about the silicone rubber before gel polymerization, by using a low-viscosity LTV addition-curing type silicone rubber as a main agent and, if necessary, kneading a predetermined amount of soft feeling elastomer as a regulator. Form. By changing the amount of the adjusting agent, two or more kinds of backing materials having different hardnesses can be formed.

A description will be given of a case in which two types of lining materials are used: a first lining material and a second lining material that is softer than the first lining material.
The hardness after curing of the silicone rubber forming this first backing material is 55 to 45 of Asker C, and the hardness after curing of the silicone rubber forming the second backing material is 45 to 15 of Asker C. It is preferable to do this.
The thicker mucosal layer in the mouth does not have much cushioning or buffering effect. Therefore, the first lining material is placed in such a part, and the cushioning or buffering effect is relatively small in the thinned mucosal layer. What is necessary is just to arrange | position a big 2nd lining material.

As described above, the silicone rubbers of the first and second lining materials are each composed mainly of an addition-curing type silicone rubber having a low viscosity LTV, and at least the silicone for gel polymerization of the second lining material. The rubber can be formed so that the second backing material becomes softer than the first backing material after curing by mixing a soft feeling elastomer with the main agent as a regulator.
For example, as a low viscosity LTV (addition-curing type silicone rubber) as the main agent, SILASTIC MDX4-4210 (trade name) manufactured by Toray Dow Corning Co., Ltd., or Real Stick A-588 sold by Factor II in the United States. -2 (product name) can be adopted.
7-9600 (trade name) manufactured by Toray Dow Corning Co., Ltd. can be used as the soft feeling elastomer that serves as the above-mentioned adjusting agent.

The first backing material is formed by mixing MDX4-4210 to less than 100 parts by weight and 75 parts by weight or more, and 7-9600 to be greater than 0 and 25 parts by weight or less to be 100 parts by weight as a whole. Alternatively, it is preferred that the first backing material is 100 parts by weight of MDX4-2410 and 7-9600 is not mixed at all.
Then, 50 to 25 parts by weight (50 parts by weight or less and 25 parts by weight or more) of the MDX4-4210 is mixed so that the adjustment agent is 50 parts by weight or more and less than 75 parts by weight to be 100 parts by weight as a whole. Thus, it is preferable to form a silicone rubber before gel polymerization of the second backing material.
This is because if the blending ratio of the above 7-9600 exceeds 50 parts by weight, it becomes too soft and unsuitable for use as a sticky denture.
However, the constituent materials of both the first and second lining materials are not limited to such numerical ranges, and even if they are outside the above numerical ranges, the second lining materials are more second than the first lining materials. If the lining material is soft, it is included in the present invention.

The case where a real stick is used as the main agent will be described. The real stick is less than 100 parts by weight and 90 parts by weight or more, and the above 7-9600 is greater than 0 and less than or equal to 10 parts by weight. The first backing material is preferably formed, or the first backing material is preferably not mixed with 7-9600 at 100 parts by weight of the real stick.
Then, with respect to 90 to 70 parts by weight (90 parts by weight or less and 70 parts by weight or more) of the real stick, the adjusting agent is mixed by 10 parts by weight or more and less than 30 parts by weight to be 100 parts by weight as a whole. Thus, it is preferable to form the second lining material. This is because if the blending ratio of 7-9600 is more than 30 parts by weight with respect to the real stick, the tensile strength is remarkably lowered, the elongation is lost, and it becomes tattered.

On the surface of the denture base that is fixed to the human body, the first lining material is disposed so as to surround the second lining material. Surrounding here means that the first lining material surrounds each direction around the second lining material around the second lining material on the surface of the denture base fixed to the human body, The first lining material is provided only at two positions opposite to each other across the second lining material, that is, the respective backing materials are arranged in a straight line, It also includes that the first lining material is sandwiched between the two first lining materials.
With such an arrangement, a normal lining material that is harder than the lining material around the soft lining material that deforms while softening the contact with sensitive areas in the mouth is a denture. The floor can be securely fixed to the premises.

For example, as shown in FIG. 9, in the denture base 2 in which the artificial tooth 100 is provided on the upper surface 2a and the bottom surface 2b is fixed to the mouth, both the first and second lining materials 9a and 9b are provided on the bottom surface 2b. The second lining material 9b is disposed at a position of the bottom surface 2b of the denture base 2 in contact with the mucous membrane 10 covering the bone crest k1 of the bone k2, and the first lining material 9a is the first lining material 9a. 2 It can be implemented as one that surrounds the lining material 9b and abuts against the mucous membrane 10 that covers the heel portion of the bone k2.
The mucous membrane 10 covering the bone crest k1 is often sandwiched between the protruding crest k1 and the denture when receiving a force from the denture during mastication, and is often accompanied by pain. Therefore, as described above, the denture is securely fixed by the first lining material 9a, and the mucous membrane 10 covering the bone crest k1 is softer than the first lining material 9b and attached. It improves the feeling.
Further, not only the bone crest k1, but also the other bulging portion of the bone k2 or the portion of the bone k2 that starts to rise toward the bone crest k1, the bottom surface of the denture base that abuts against the mucous membrane covering these portions, It can also be implemented by arranging two backing materials 9b.

Still another embodiment of the arrangement of each backing material will be described.
FIG. 10A shows a schematic plan view of the upper jaw m1, and FIG. 10B shows a schematic plan view of the lower jaw m2. 11A shows a surface (bottom surface) that contacts the mucous membrane 10 in the mouth of the denture base used for the upper jaw, and FIG. 11B shows a surface (bottom surface) that contacts the mucosa 10 in the mouth of the denture base used for the lower jaw. ).

On the bottom surface 2b of the denture base 2 of the maxillary denture, a second lining material 9b is located at a position A shown in FIG. 11 (A) corresponding to the palatal a of the upper jaw m1 shown in FIG. 10 (A). Be placed. Further, on the bottom surface 2b of the denture base 2 of the maxillary denture, second positions B and B shown in FIG. 11B corresponding to the maxillary nodules b and b of the maxilla m1 shown in FIG. The lining material 9b is arranged. And the 1st lining material 9a is arrange | positioned around these positions A, B, B in the said bottom face of a denture base. In the upper jaw, the palatine fistula a is usually at a position over the upper lip band m11 and the incisor nipples m12, m12, and is positioned between the left and right cheek bands m13, m13. The maxillary nodules b and b form a triangular apex together with the palatal fold a to surround the palate bulge.
This is because the mucous membrane 10 covering the maxillary nodule a and the palatal fistulas b and b is thin and sensitive, so it is desirable to make the contact softer than the other parts of the denture base.

On the bottom surface 2b of the denture base 2 of the lower jaw denture, the second positions C and C shown in FIG. 11B correspond to the lower alveolar tubes c and c of the lower jaw m2 shown in FIG. 10B. A lining material 9b is arranged. And the 1st lining material 9a is arrange | positioned around these positions C and C in the said bottom face of a denture base. This is because, in the lower jaw, the lower alveolar tubes c and c are located between the canine teeth and the molar teeth, and are places where nerves pass. In FIG. 10B, m21 represents the lower lip strip, m22 represents the tongue strip, m23 represents the pear-like ridge, and m24 represents the maxillohyoid line.
However, the arrangement is not limited to the arrangement shown in FIGS. 9 and 11, and the second lining material can be arranged at other positions in the mouth according to the user's request.

In any case, the first lining material 9a may surround the second lining material 9b without any break on the fixed surface (bottom surface 2b) of the denture base, It can be implemented even if it exists and surrounds. However, when the first lining material 9a surrounds the second lining material 9b without a break, an effect of sucking and sucking like a suction cup can be obtained, and the soft second lining material 9b can be securely attached. It can be fixed at a desired position.
Further, if the first backing material 9a surrounds the second backing material 9b without any breaks, the second backing material 9b can be used for the above-mentioned first backing material 9a at the time of heat molding. It is preferable that it does not flow out of the cut.
Further, the first lining material 9a and the second lining material 9b are arranged with a space therebetween and can be carried out without contact with each other. However, as shown in FIGS. The material 9a and the second lining material 9b are preferably arranged in contact with each other. This is because the first and second lining materials 9a and 9b are continuously arranged, so that no step is generated and there is no sense of incongruity.
As described above, by making the first and second lining materials 9a and 9b different in hardness, the thickness of both lining materials 9a and 9b is made constant at each position on the bottom surface of the denture base. A hitting portion and a softer hitting portion can be formed, and this also does not cause a sense of incongruity.
The second lining material may be arranged at a position other than the positions A, B, and C shown in FIG. 9 and FIG. 11, and the positions A, B, and C shown in FIG. 9 and FIG. It is not limited to what arrange | positions 2 lining materials.

Furthermore, the first backing material, the second backing material softer than the first backing material, and the third backing softer than the first backing material and harder than the second backing material. It is also possible to carry out by providing the dressing on the denture base.
In this case, for example, the second backing material can be provided at position A and the third backing material can be provided at positions B and B shown in FIG. In addition, the second and third lining materials can be arranged at positions A and B in reverse to the above, and further, either one of the left and right positions B and B, The second lining material can be arranged, and the third lining material can be arranged on either side. Also in this case, according to a user's request, arrangement | positioning of the 2nd and 3rd lining material can be made into positions other than the above. For example, in the above description, the second lining material is not surrounded by the third lining material, but the second lining material does not exclude what is surrounded by the third lining material.
Further, it is possible to respond to the user's demands more finely by using four or more types of lining materials having different hardness, and the present invention does not exclude such implementation.
When forming a backing material of three kinds of hardness, the blending ratio of 7-9600 to MDX4-4210 is 0-10 parts by weight with respect to the silicone rubber of the first backing material, The amount is preferably 10 to 25 parts by weight for the silicone rubber and 25 to 35 parts by weight for the silicone rubber of the third lining material. For example, the blend ratio of 7-9600 with respect to MDX4-4210 is 25% by weight (total 100%) for the first backing material, 30% by weight (100% total) for the second backing material, and the third backing material. The dressing can be implemented as 50 wt% (100% total). However, such a ratio is an example and can be variously changed.

As described above, a method for manufacturing a denture provided with two or more lining materials having different hardnesses on the denture base will be described.
Also in this case, the same method as that of the embodiment shown in FIGS. 1A to 1D except that silicone rubber having different hardness is disposed on the surface of the denture base, which is a semi-finished product, after removing the paraffin wax and dried. -Produce dentures under conditions.
The difference from the manufacturing method shown in FIG. 1 will be described. After the paraffin wax 3 of the denture base 2 shown in FIG. 1 (C) is removed and the surface is dried, two kinds of mixing ratios of the main agent and the adjusting agent are different. Add a hydrogenpolysiloxane as a crosslinking agent (10% by volume with respect to silicone as described above), ethylene dimethacrylate (0.05 to 1.0% by volume with respect to silicone as described above) and a platinum catalyst to each silicone rubber. Two types of silicones 8a and 8b formed by mixing are disposed on the surface of the denture base 2 after drying. As described above, the two types of silicones are obtained by changing the blending ratio of the regulator to the main agent. At this time, the silicone 8b, which becomes the second backing material after curing, is disposed at a position where it abuts against a sensitive portion in the mouth, for example, positions AC in FIGS. 9 and 11, and the first backing material after curing. The silicone 8a to be used is disposed so as to surround the silicone 8b to be the second lining material after the curing.
Thereafter, as shown in FIG. 12, the upper flask 4 is put on and sealed with a bolt 14 and accommodated in a pressure cooker (not shown), and 100 ° C. to 130 ° C. under a pressure of 1.2 to 3.5 atm. For about 15-25 minutes. Thereby, the silicone 8 is polymerized and cured into a soft rubber shape so as to match the cavity shape of the portion where the paraffin wax 3 (FIG. 1B) was present. This is the same as the embodiment shown in FIG. However, such temperature and pressure conditions can be changed.
Even if the silicone 8a serving as the first backing material surrounding the silicone 8b serving as the second backing material is connected to surround the silicone 8b serving as the second backing material, It may be intermittent, or it may be arranged so as to be scattered around the silicone 8b as the second backing material, but soft silicone as the second backing material during pressurization and heating It is preferable that the silicone 8a serving as the first backing material is continuous, that is, without any break, and surrounds the silicone 8b serving as the second backing material so that the 8b does not flow out of the denture base.
Moreover, since the soft silicone 8b used as the second lining material is easier to spread than the silicone 8a used as the first lining material at the time of pressure molding, the thickness of both lining materials after molding is made constant. In addition, the cone 8b, which becomes the second lining material after molding, is more (higher) than the silicone 8a, which becomes the first lining material after molding, on the exposed surface of the denture, which is a semi-finished product, before pressing. It is desirable to keep it. Further, since both the silicones 8a and 8b spread in the lateral direction at the time of pressure molding, both the silicones 8a and 8b are preferably placed on the exposed surface with an interval in consideration of such spreading.
In addition, in the case of providing three types of hardness lining materials, the manufacturing method described above except that a part of the silicone 8b that becomes the second lining material 9b after curing is replaced with silicone that becomes the third lining material. It can be manufactured by the same method.

  Next, an Example and a comparative example are shown about adhesion | attachment between the resin which is a denture base of the denture based on this invention, and said silicone rubber which is a lining material.

Example 1
Silicone rubber 100% by volume
Ethylene dimethacrylate 0.05% by volume
Total 100.05% by volume

(Example 2)
Silicone rubber 100% by volume
Ethylene dimethacrylate 0.1% by volume
Total 100.1% by volume

(Example 3)
Silicone rubber 100% by volume
Ethylene dimethacrylate 0.2% by volume
Total 100.2% by volume

Example 4
Silicone rubber 100% by volume
Ethylene dimethacrylate 0.5% by volume
Total 100.5% by volume

(Example 5)
Silicone rubber 100% by volume
Ethylene dimethacrylate 0.6% by volume
Total 100.6% by volume

(Example 6)
Silicone rubber 100% by volume
Ethylene dimethacrylate 1.0% by volume
Total 101.0% by volume

(Comparative example)
Silicone rubber 100% by volume
Methyl methacrylate 0.3% by volume
Total 100.3% by volume

A peeling test was performed on the above-described Examples and Comparative Examples. As a test piece of each example / comparative example, the silicone of each of the examples and comparative examples having a lateral width of 30 mm and a thickness of 1.5 mm is similarly applied to a small piece formed of a resin having a lateral width of 30 mm and a thickness of 1.5 mm. A laminate of small pieces made of rubber was used. That is, a 180 degree peel adhesion strength test was performed on these test pieces. Specifically, for this test piece, an end portion where both small pieces overlap was pulled at an angle of 180 degrees in the longitudinal width direction using an Instron universal material testing machine 5582 type. The crosshead speed (tensile speed) was 200 mm / min. The temperature of the test environment is 23 ° C. and the humidity is 50% RH.
The test pieces of Examples 1 to 6 were prepared by the manufacturing method shown in FIG. 1 (although the shape differs from that of the denture), and in each of the steps shown in FIG. The atmospheric pressure was 3.5 atmospheric pressure, and heating was performed at 115 ° C. for 15 minutes. Moreover, also about the comparative example, it was the same as that of the said Example about conditions other than an additive.
For each of the examples and comparative examples, the following four samples are prepared, and the component blending ratios of the samples are all as described above, and each sample is subjected to a peel test to obtain an average value. It was set as the test result of an Example and a comparative example.
Specifically, Nissin's natural resin (trade name) is used as the resin resin, Factor II's Real Stick A-588-2 (trade name and product number) is used as the silicone rubber, and CG Corporation is used as the resin resin. A sample using the above-mentioned real stick A-588-2 for silicone rubber, and Metadent (registered trademark / trademark holder: Mitsui Chemicals) of Sun Medical Co., Ltd. for the resin resin. Using the above-mentioned sample using Dow Corning's SILASTIC MDX4-4210 (registered trademark and product number) as the silicone rubber, using the above metadent as the resin resin, and using the EVA Touch Super ( A sample using Evatouch / registered trademark) was prepared.
The result (average value) was as follows.

Example 1
When a tensile force of 22.8 N was applied, the resin piece and the silicone rubber piece began to peel. Neither the resin piece nor the silicone rubber piece was broken.

(Example 2)
When a tensile force of 30 N was applied, the resin piece and the silicone rubber piece began to peel. Neither the resin piece nor the silicone rubber piece was broken.

(Example 3)
When a tensile force of 58.3 N was applied, the resin piece and the silicone piece began to peel. A piece of silicon rubber was cut off.

Example 4
When a tensile force of 64 N was applied, the resin piece and the silicone rubber piece began to peel. A piece of silicon rubber was cut off.

(Example 5)
When a tensile force of 18.2 N was applied, the resin piece and the silicone piece began to peel. Softening of the silicone rubber pieces occurred.

(Example 6)
When a tensile force of 15.3 N was applied, the resin piece and the silicone piece began to peel. Softening of the silicone rubber pieces occurred.

(Comparative example)
When a tensile force of 23 N was applied, the resin piece and the silicone piece began to peel. Both pieces peeled off without breaking.

  As described above, it can be confirmed that any of Examples 1 to 5 of the present invention has a peel strength of 15 N or more, and is practical. In particular, in Examples 2 to 4, the peel strength is 30 N or more in the range of 0.1% to 0.6% by volume of ethylene dimethacrylate added to 100% by volume of silicone rubber. It turns out that it exceeds 23N of an example. Further, in particular, when Example 3 and Example 4 are seen, peeling is more than double that of the comparative example when the amount of ethylene dimethacrylate added to 100% by volume of silicone rubber is in the range of 0.2% to 0.6% by volume. It turns out that it has gained strength.

   FIG. 6A shows a 1000-fold image of the surface of the test piece of Example 4 using a scanning electron microscope (SEM). FIG. 6B shows a 1000-times image of the surface of the test piece of the comparative example by SEM, and FIG. 7 shows an image of the surface of the test piece of the comparative example by 1500 times by SEM. For each SEM image of FIG. 6 and FIG. 7, in order to make it easy to see the undulations on the surface, the surface of the test piece is not viewed from the front but is taken from a diagonal view.

When FIG. 6A is compared with FIG. 6B, the test piece surface (FIG. 6A) of Example 4 of the present invention is more on the test piece surface of the comparative example (FIG. 6B). It can be seen that it is smoother (with less undulations). Even when the magnification of the SEM is further increased to 1500 times, as shown in FIG. 7, the surface of the test piece of the comparative example still has many surface undulations compared to the surface of the test piece of Example 4. 6B and FIG. 7, it can be seen that a large amount of dust a adheres to the undulation dent on the surface of the test piece of the comparative example. As shown in FIG. 6A, no such dust is seen on the surface of the test piece of Example 4.
Each test piece of the example and the comparative example is subjected to ultrasonic cleaning after formation, and is further prepared to remove surface deposits that are usually performed to obtain an SEM image. The dust attached before observation remains. Thus, it can be seen that in the comparative example, dirt is easily attached due to the undulation of the surface, and once attached dirt is not easily removed.

FIG. 8A shows an SEM image obtained by enlarging the vicinity of the boundary between the resin layer (resin small piece) x1 and the silicone rubber layer (silicone rubber small piece) y1 on the surface of the test piece of Example 4 by 500 times. B) shows an SEM image in which the vicinity of the boundary between the resin layer (resin small piece) x2 and the silicone rubber layer (silicone rubber small piece) y2 on the surface of the test piece of the comparative example is magnified 500 times. 8A and 8B are both front views of the test piece surface.
As seen in FIG. 8B, the boundary line kk between the resin layer x2 and the silicone rubber layer y2 appears linearly on the surface of the test piece of the comparative example, and the boundary between both layers is clear. On the other hand, as can be seen in FIG. 8A, on the surface of the test piece of Example 4, the boundary line kk between the resin layer x1 and the silicone rubber layer y1 is complicated, and the boundary between the two layers becomes ambiguous. Yes. This indicates that both layers are chemically bonded.
From this, it can be seen that the present invention firmly fixes the lining material to the denture base by a mechanism different from the invention of Patent Document 1.

The example of each silicone rubber before mixing ethylene dimethacrylate which forms these backing materials in the case of using the first and second kinds of backing materials will be described.

(Example a)
Silicone rubber for the first lining material Main agent MDX4-2410 100 parts by weight Modifier 7-9600 0 parts by weight
Total 100 parts by weight Silicone rubber for the second lining material Main agent MDX4-4210 50 parts by weight Modifier 7-9600 50 parts by weight
Total 100 parts by weight

(Example b)
Silicone rubber for the first lining material Main agent MDX4-2410 75 parts by weight Adjusting agent 7-9600 25 parts by weight
Total 100 parts by weight Silicone rubber for the second lining material Main agent MDX4-4210 50 parts by weight Modifier 7-9600 50 parts by weight
Total 100 parts by weight

(Comparative Example x)
Silicone rubber for the first lining material Main agent MDX4-2410 75 parts by weight Adjusting agent 7-9600 25 parts by weight
Total 100 parts by weight Silicone rubber for second lining material Main agent MDX4-4210 45 parts by weight Modifier 7-9600 55 parts by weight
Total 100 parts by weight

  For the above Examples a to c and Comparative Example x, the curing condition was a press cure for 3 minutes at 150 degrees Celsius, followed by a post cure for 1 hour at 150 degrees Celsius. In any case, the hardness was measured as a rubber sheet having a thickness of 6 mm. The press cure is a step for starting the pressurization, and is a step for starting polymerization and performing polymerization. The press cure here is a method in which rubber is placed in a flask to perform press (pressurization) polymerization, and the pressure is increased from 1 atm to 3.5 atm. Post-cure is a process of performing polymerization under a normal constant pressure, and is performed subsequent to press cure. Here, the pressure is increased to 3.5 atm by press cure, and the 3.5 atm is maintained for the above time by post cure.

In Example a, after curing, a first backing material of 55 (31 in JIS TYPE A) was obtained with Asker C, and a second backing material of 15 (unmeasureable in JIS TYPE A) was obtained with Asker C. Obtained.
In Example b, after curing, a first backing material of 45 (20 in JIS TYPE A) was obtained with Asker C, and a second backing material of 15 (unmeasureable in JIS TYPE A) was obtained with Asker C. Obtained.
In Comparative Example x, after curing, a first backing material of 45 (20 in JIS TYPE A) was obtained with Asker C, but the second backing material was too soft and the hardness could not be measured. Touching with a finger makes it sticky and not suitable for use on dentures.

Claims (7)

In a denture provided with an artificial tooth, a denture base that supports the artificial tooth and has polymethyl methacrylate as a main component, and a lining material provided on a surface to be fixed to the human body of the denture base,
As the above-mentioned lining material, it comprises at least two kinds of lining materials, a first lining material and a second lining material softer than the first lining material,
Each of the above lining materials,
General formula

(M + n = 50 to 2000) is a silicone rubber obtained by gel polymerization by adding ethylene dimethacrylate to silicone.
The denture, wherein the first lining material is disposed so as to surround the second lining material on the surface of the denture base fixed to the human body. The hardness of the first lining material is 55-45 of Asker C,
Hardness of the second backing component is denture according to claim 1, characterized in that the 45 to 15 Asker C. Forming a respective said backing component, each of the sheet silicone rubbers for the above gel polymerization is for the main ingredient of the addition-curable low viscosity LTV silicone rubber,
The silicone rubber for gel polymerization, which forms at least the second backing material, is mixed with the main agent using a soft feeling elastomer as a regulator, so that the second backing material is more than the first backing material. The denture according to claim 1 or 2 , wherein the denture is softly formed. The denture according to any one of claims 1 to 3 , wherein the second lining material is disposed at a position of the bottom surface of the denture base that contacts the mucous membrane covering the bone crest. A dental prosthesis is mounted to the upper jaw, the second backing component described above, the bottom surface of the denture base, 1 to claim, characterized in that one which is disposed in a position in which it contacts the upper node or palatal folds The denture according to any one of 3 above. A dental prosthesis is mounted to the lower jaw, a second backing component described above, according to claim 1, wherein the denture floor bottom surface, in which are arranged in the mucosa and abutment to a position covering the inferior alveolar tube Dentures in any one of thru | or 3 . As the lining material, the first lining material, the second lining material softer than the first lining material, and softer than the first lining material and harder than the second lining material. A third lining material, comprising at least three lining materials,
The denture according to any one of claims 1 to 6 , wherein the first lining material is disposed on the bottom surface of the denture base so as to surround the second and third lining materials. .

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