JP2001149385A - Prosthesis for dental use - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a prosthesis for dental use which is easy in manufacture, excellent in compatibility with teeth, excellent in appearance and mechanical strength, and free from any use of metal. SOLUTION: A frame is formed of ceramic, and polymerizable composition mainly consisting of a polymerizable monomer, an inorganic filler and a polymerizing catalyst is built up on the frame, and polymerized and hardened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a dental prosthesis. More specifically, the present invention relates to a dental prosthesis in which a ceramic is used as a frame, and a polymerizable composition mainly composed of an inorganic filler, a polymerizable monomer, and a polymerization catalyst is laid on the frame and polymerized and cured. The dental prosthesis of the present invention is particularly suitable as a crown prosthesis restoration for repairing tooth defects such as crowns, inlays, onlays, and bridges.

[0002]

2. Description of the Related Art When a tooth is lost or lost, a restoration similar to the shape of a tooth called a crown or a bridge is prepared outside the oral cavity, and this is set on an abutment tooth in the oral cavity and treated. Conventionally, dental metals and porcelain (porcelain) have been mainly used as such crowns and bridges, and in recent years, composite resins and crystallized glass have also been used.

As described above, metal has been mainly used for crowns and bridges because of its high strength and reliability. Recently, so-called crown-colored restorations having the same color as natural teeth have been used. Due to the trend toward materials and the problem of metal allergies, porcelain and composite resins have been increasingly used. However, crowns and bridges made of only porcelain and composite resin are difficult to obtain mechanical strength enough to withstand strong occlusal force in the oral cavity, and dental metal is cast to ensure mechanical strength. Such a crown-colored restorative material is pre-coated on a metal frame manufactured as described above.

[0004] However, even in such a restoration material combined with a metal frame, the metal is still used in the oral cavity, and the metal is exposed to the surface at the gingival margin, resulting in poor aesthetics. The aforementioned problem of metal allergy has not been solved. Therefore, at present, the development of crowns and bridges that do not use any metal is strongly desired. Japanese Patent Application Laid-Open No. H11-216149 discloses a crown or bridge which does not use any metal, in which a frame material is formed of resin. Further, Japanese Patent Application Laid-Open No. Hei 3-503848, Japanese Unexamined Patent Publication No.
As can be seen in JP-A-84952 and JP-A-5-310525, bridges combining fiber-reinforced materials and composite resins are partially commercialized by applying the technology of fiber-reinforced plastics.

[0005] However, also in these, the mechanical strength is still insufficient, and the risk of breaking in the oral cavity is not small. Although a system for producing an all-ceramic crown or bridge has been commercialized, the operation is complicated, and the compatibility with the abutment teeth tends to be poor.

[0006]

On the other hand, in order to improve this, a portion corresponding to a conventional metal frame is prepared in advance from a ceramic material, and then a dental porcelain is baked thereon, resulting in excellent aesthetics. A method for producing an all-ceramic crown or bridge has been proposed by Vita and Nobel Biocare. However, this method requires a step of heating at a high temperature when baking the porcelain material on the frame material, and at this time, the dimensions and shape of the material are changed, and a crown and a bridge having excellent compatibility are produced. It is very difficult. Accordingly, it is an object of the present invention to provide a crown or bridge that is easy to manufacture, has excellent compatibility with teeth, has excellent aesthetics and mechanical strength, and does not use any metal.

[0007]

DISCLOSURE OF THE INVENTION The present inventors have conducted intensive studies on dental prostheses using ceramics as a frame material for crowns and bridges, and as a result, have set up a polymerizable composition on a ceramics frame, The inventors have found that the above objects can be achieved by polymerization and curing, and have completed the present invention. That is, the present invention is a dental prosthesis in which a ceramic is used as a frame, and on the frame, a polymerizable composition containing an inorganic filler, a polymerizable monomer and a polymerization catalyst as main components is laid, and polymerized and cured. .

[0008]

A major feature of the present invention resides in that a polymerizable composition is laid on a ceramic frame and polymerized and cured to obtain a dental prosthesis. As such ceramics, known engineering ceramics such as alumina, zirconia, silicon carbide, silicon nitride, and sialon can be used. However, mechanical strength and aesthetics, and further, a polymerizable composition built up on a frame It is preferable to use a ceramic having alumina as a base material from the viewpoint of adhesion to the ceramic.

As a method of manufacturing a ceramic frame, a method similar to the method of manufacturing a porcelain crown with a conventional dental porcelain is used. There is a method of cutting out a manufactured ceramic block into a desired shape by machining. In particular, the latter method is preferable because a frame material having excellent mechanical strength can be easily obtained regardless of the material of the ceramic.

In the dental prosthesis of the present invention, a polymerizable composition comprising a polymerizable monomer, an inorganic filler and a polymerization catalyst as main components is laid on the above-mentioned frame and polymerized and cured to obtain a desired material. To produce a crown or a bridge, as the polymerizable monomer, known ones can be widely used,
Usually, (meth) acrylate-based monomers (meaning methacrylate and acrylate) used for dental use are suitable. Examples of the (meth) acrylate include methyl (meth) acrylate, ethylene glycol di (meth) acrylate, 2-hydroxyethyl (meth) acrylate, triethylene glycol di (meth) acrylate, and neopentyl glycol di (meth) acrylate. , Hexanediol di (meth) acrylate, decanediol di (meth) acrylate, 2,
2-bis [4- (3-methacryloyloxy-2-hydroxypropoxy) phenyl] propane (Bis-GM
A), 2,2-bis [(meth) acryloyloxypolyethoxyphenyl] propane, trimethylolpropane tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, 2,
2,4-trimethylhexamethylene diisocyanate 1
Adduct of 2 mol of 2-hydroxyethyl (meth) acrylate and 2 mol of 2,2,4-trimethylhexamethylene diisocyanate and 2 mol of glycerin di (meth) acrylate, 10-methacryloyloxydecyl dihydro Diene phosphate, 3-methacryloyloxypropyltrimethoxysilane, 4- [2-
(Meth) acryloyloxyethoxycarbonyl] phthalic acid, 4- [2- (meth) acryloyloxyethoxycarbonyl] phthalic anhydride and the like. These polymerizable monomers are used alone or as a mixture of several kinds.

As the inorganic filler used in the present invention, similarly known fillers can be used. For example, silica or silica, which is mainly composed of Ba, La, Sr, Z
Glasses containing oxides such as r and Ti (for example, barium boroaluminosilicate glass, strontium boroaluminosilicate glass), borosilicate glass, fluoroaluminosilicate glass, alumina, titanium oxide, zirconia and the like are preferably used. it can. Further, an organic-inorganic composite filler obtained by once kneading colloidal silica and a polymerizable monomer, polymerizing and curing, and then pulverizing the same can also be used. Such an inorganic filler is generally used in an amount of 1 to 200 parts by weight, preferably 5 to 100 parts by weight, based on 10 parts by weight of the polymerizable monomer.

As the polymerization initiator used in the present invention, known initiators can be used without limitation. For example, in the case of performing heat polymerization, an organic peroxide such as benzoyl peroxide, azobisisobutyric acid, etc. An azo compound such as lonitrile is preferably used. When room temperature polymerization is performed, benzoyl peroxide / dimethylaniline system,
A redox system such as a cumene hydroperoxide / thiourea system, an organic sulfinic acid (or a salt thereof) / amine / peroxide system, or the like is suitably used.

When photopolymerization is carried out, for example, α-diketone / reducing agent, ketal / reducing agent, thioxanthone / reducing agent and the like can be mentioned. Examples of α-diketones include camphorquinone, benzyl, 2,3-pentanedione and the like. Examples of ketals include benzyl dimethyl ketal, benzyl diethyl ketal, and the like.
Examples of thioxanthone include 2-chlorothioxanthone, 2,4-diethylthioxanthone and the like.
Examples of the reducing agent include 2- (dimethylamino) ethyl methacrylate, ethyl 4-dimethylaminobenzoate,
Tert-amines such as butoxyethyl dimethylaminobenzoate and N-methyldiethanolamine, aldehydes such as dimethylaminobenzaldehyde and terephthalaldehyde, and thiol groups such as 2-mercaptobenzoxazole, decanethiol and 3-mercaptopropyltrimethoxysilane. And the like.

Further, a system in which an organic peroxide is added to these redox systems is also suitably used. When photopolymerization by ultraviolet irradiation is performed, benzoin alkyl ether, benzyl dimethyl ketal, and the like are preferable. Further, as the photopolymerization initiator, an acylphosphine oxide compound is also particularly preferably used. These polymerization initiators are added in a range of 0.01 to 10% by weight based on the polymerizable monomer.

The polymerizable composition used in the present invention is a paste-like composition containing an inorganic filler for the purpose of improving mechanical strength and abrasion resistance, and is generally called a dental composite resin. The composition is preferably a crown color in terms of aesthetics. If necessary, a colorant, a pigment, an ultraviolet absorber, an antioxidant, a fluorescent pigment, and the like may be appropriately added to the polymerizable composition to such an extent that the effects of the present invention are not impaired.

The polymerizable composition used in the present invention preferably has a high elastic modulus after polymerization and curing. The reason for this is that, in addition to the durability of the cured product in the oral cavity, the adhesion durability between the ceramic surface and the polymerizable composition largely depends on the elastic modulus of the cured product of the polymerizable composition which directly receives occlusal force. This is because the higher the elastic modulus, the better the adhesive durability. For this reason, the international standard for dental composite resins, ISO
The flexural modulus measured by the bending strength test method shown in 4049 is 5 to 50 GPa, preferably 10 to 30 GPa.
It is preferably within the range of a. In order to obtain such a high elastic modulus, the polymerization conditions and selection of a polymerizable monomer, and filling of an inorganic filler at a high density may be appropriately performed.

In the dental prosthesis of the present invention, in order to more firmly bond the interface between the ceramic frame and the polymerizable composition, an adhesive containing an adhesive monomer having at least one acidic group in the molecule is used. It is desirable to use an agent. In this case, it is preferable to select a material containing alumina as a component of the ceramics of the frame because the adhesiveness is further excellent. The adhesive monomer having such an acidic group includes a phosphate residue, a phosphonate group, a pyrophosphate residue, a thiophosphate residue,
It is a compound having an acidic group such as a carboxylic acid residue or a sulfonic acid residue, and specific examples include the following.

Examples of the polymerizable monomer having a phosphoric acid residue include 2- (meth) acryloyloxyethyl dihydrogen phosphate, 10- (meth) acryloyloxydecyl dihydrogen phosphate,
-(Meth) acryloyloxyeicosyl dihydrogen phosphate, 1,3-di (meth) acryloyloxypropyl-2-dihydrogen phosphate, 2
-(Meth) acryloyloxyethylphenyl phosphoric acid,
Examples thereof include 2- (meth) acryloyloxyethyl-2′-bromoethylphosphoric acid, (meth) acryloyloxyethylphenylphosphonate, and the like, and acid chlorides thereof.

Examples of the polymerizable monomer having a pyrophosphate residue include di (2- (meth) acryloyloxyethyl) pyrophosphate and the like, and acid chlorides thereof. Examples of the polymerizable monomer having a thiophosphoric acid residue include, for example, 2-
(Meth) acryloyloxyethyl dihydrogen dithiophosphate, 10- (meth) acryloyloxydecyl dihydrogen thiophosphate, and acid chlorides thereof.

Examples of the polymerizable monomer having a carboxylic acid residue include (meth) acrylic acid and succinic acid mono (2
-(Meth) acryloyloxyethyl), mono (2- (meth) acryloyloxyethyl) isophthalate, N-
(Meth) acryloyl-5-aminosalicylic acid, 4-vinylbenzoic acid, 4- (meth) acryloyloxyethoxycarbonylphthalic acid, 4- (meth) acryloyloxyethoxycarbonylphthalic anhydride, 5- (meth) acryloylaminopentyl Carboxylic acid, 11- (meth)
Acryloyloxy-1,1-undecanedicarboxylic acid and the like and acid chlorides thereof. Examples of the compound having a sulfonic acid group include styrene sulfonic acid.

Among these compounds, phosphoric acid derivatives are preferable in that they have excellent interfacial adhesive strength.
(Meth) acryloyloxydecyl dihydrogen phosphate, 2- (meth) acryloyloxyethyl phenylphosphoric acid, and 2- (meth) acryloyloxyethyl phenyl phosphonate are preferred. One or more of these vinyl compounds having an acidic group may be used in combination.

The form of the adhesive containing the adhesive monomer having an acidic group can be used by applying the adhesive monomer alone as an adhesive on the surface of the ceramic frame. From the viewpoint of ease and adhesiveness, it is usually used as a liquid or paste-like polymerizable composition containing a known polymerizable monomer or solvent, and further, if necessary, a polymerization catalyst or a filler. is there. Such a liquid or paste-like adhesive is applied on a ceramic frame, and a paste of a crown color such as a dentin color or an enamel color comprising a filler, a polymerizable monomer, and a polymerization catalyst is formed thereon. The dental prosthesis of the present invention can be obtained by laying and polymerizing and curing a polymerizable composition in a shape.

As the polymerizable composition, a method of preparing a composition having several kinds of colors in advance and obtaining a color tone and texture similar to natural teeth is usually used. When a photopolymerizable composition is used as the crown-colored polymerizable composition, there is an advantage that a technical operation is easy. Further, after curing by photopolymerization, the strength can be increased by heating to drive the polymerization. After the cured product is appropriately modified in shape, the surface is polished to obtain a prosthesis having excellent aesthetics. The prosthesis of the present invention can be applied not only to crowns and bridges that cling onto abutments, but also to adhesive bridges and superstructures of implants. Hereinafter, the present invention will be described specifically with reference to Examples, but the present invention is not limited to these Examples.

[0024]

EXAMPLES Example 1 (1) Preparation of adhesive 1 part by weight of 10-methacryloyloxydecyl dihydrogen phosphate and 2,2-bis [4- (3-methacryloyloxy-2-) were used as adhesive monomers. Hydroxypropoxy) phenyl] propane (Bis-GMA) 3
An adhesive comprising 2 parts by weight of neopentyl glycol dimethacrylate and 94 parts by weight of methyl ethyl ketone as a solvent was prepared.

(2) Preparation of Frame An abutment model for a jacket crown of a maxillary central incisor was prepared. First, an impression was taken with a silicon impression material to prepare a sub model. Next, after sintering alumina powder (product name: Incerum, manufactured by Vita) into a sub-model with the attached dedicated liquid and sintering, remove the sub-model and adjust the frame on the abutment model. Confirmation was made. After correcting the shape of the frame with a diamond bar or the like, build up glass powder on the frame, further penetrate the glass by sintering, remove excess glass remaining on the sintered body frame, A core material corresponding to the frame as shown in FIG. 1 was produced. In FIG. 1, 1 is a ceramic frame,
2 is an abutment model, 3 is a tooth model, and 4 is a gingival model.

(3) Preparation of dental prosthesis (crown) The surface of the alumina frame material obtained in (2) was subjected to sandblasting, washed with water, and then the adhesive prepared in (1) was applied with a brush. On top of that, Opaque Resin (OA3 shade), a low-viscosity composite resin attached to Kuraray's light-cured crown resin "Seceed II"
Was applied and light was irradiated for 180 seconds using a dental light irradiator (manufactured by Morita: α-light) to perform photopolymerization. On top of this, Secido, a composite resin for the crown,
A dentin paste (DA3 shade) of II was built up and photopolymerized (30 seconds), and an enamel paste (E2 shade) was built thereon and photopolymerized (60 seconds). When the shape of the cured composite resin was modified and the surface was polished, a crown having excellent aesthetics and compatibility with the abutment tooth was completed. FIG. 2 is an external view of the obtained crown, and 5 is the crown. FIG. 3 is a cross-sectional view thereof, in which 6 is an adhesive layer, 7 is a cured dentin composite resin, and 8 is a cured enamel composite resin.

Example 2 A high-density sintered alumina block was cut by machining to produce a frame material for a bridge corresponding to the loss of the lower first molar as shown in FIG. 9 is an abutment model. Sandblasting was performed on the surface of the front part of the frame, and the adhesive of Example 1 was applied. Furthermore, opaque resin of Seced II (OA3 shade)
Is applied, and photopolymerization is carried out in the same manner as in Example 1. Then, pastes for the dentin color (DA3 shade) and the enamel color (E1 shade) of the hard resin for crown “Esthenia” manufactured by Kuraray Co., Ltd. The paste was used to build up and photopolymerize to form a crown. After heating at 110 ° C. for 20 minutes, shape modification and surface polishing were performed to complete a bridge having excellent aesthetics and compatibility with abutment teeth. FIG. 5 is an external view of the bridge, and 10 is a bridge. FIG.
Is a sectional view of a second molar corresponding to the left tooth or a second premolar corresponding to the right tooth of the three teeth, and FIG. 7 is a first molar (pontic) corresponding to the middle tooth. It is sectional drawing.

[0028]

According to the present invention, there is provided a dental prosthesis in which a polymerizable composition mainly comprising a polymerizable monomer, a direction filler and a polymerization catalyst is laid on a ceramics frame and polymerized and cured. be able to. The prosthesis of the present invention is a prosthesis that is easy to produce, has excellent compatibility with teeth, and does not use any metal having excellent aesthetics and mechanical strength, and is used as a dental prosthesis such as a crown or a bridge. Useful.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a core material manufactured in Example 1.

FIG. 2 is an external view of a crown manufactured in Example 1.

FIG. 3 is a cross-sectional view of the crown manufactured in Example 1.

FIG. 4 is a schematic view of a bridge frame manufactured in Example 2.

FIG. 5 is an external view of a bridge manufactured in Example 2.

FIG. 6 is a cross-sectional view (a second molar portion) of a bridge manufactured in Example 2.

FIG. 7 is a cross-sectional view (pontic portion) of a bridge manufactured in Example 2.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ceramic frame 2 Abutment model 3 Tooth model 4 Model of gingival part 5 Crown 6 Adhesive layer 7 Layer with hardened dentin composite resin 8 Layer with hardened enamel composite resin 9 Abutment model 10 Bridge

Claims (4)

[Claims] 1. A dental prosthesis comprising a ceramic frame as a frame, a polymerizable composition comprising a polymerizable monomer, an inorganic filler and a polymerization catalyst as main components on the frame, and polymerized and cured. 2. The dental prosthesis according to claim 1, wherein the ceramic is a ceramic based on alumina. 3. The interface between the frame and the polymerizable composition,
3. The dental prosthesis according to claim 1, wherein the dental prosthesis is bonded with an adhesive containing an adhesive monomer having an acidic group. 4. The dental prosthesis according to claim 3, wherein said acidic group is a phosphate group.