JP2007082679A - Kit for dental prosthesis production - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a crown restoration kit capable of producing a dental prosthesis excellent in color tone compatibility with a natural tooth in many cases of inlays and onlays though it is an easy kneading method. <P>SOLUTION: In the crown restoration kit capable of producing a dental prosthesis in a laminated structure, (A) on a hard body layer using photosetting paste for dentin part restoration in which a contrast ratio for the thickness 1.0 mm of the hard body is in the range of 0.45 to 0.55, (B) a hard body layer using the photosetting paste for enamel part restoration in which the contrast ratio for the thickness 1.0 mm for the hard body is in the range of 0.30 to 0.40. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a kit for producing a dental prosthesis comprising a plurality of photocurable pastes suitable for aesthetic restoration of inlays and onlays.

  In recent years, resin-based crown restoration materials have been widely used as materials having a color tone closer to that of natural teeth than metal and having a mechanical strength that can be used even for molar portions where high occlusal pressure is applied. Here, it goes without saying that color tone compatibility with natural teeth is regarded as important in producing a dental prosthesis using the resin-based crown material.

  Oral impressions are usually collected by a dentist, and an intraoral model is created based on the impression, and an engineer builds up the resin-based material by light curing the resin material little by little. A prosthesis is made. At this time, information on the color tone of the prosthesis is transmitted from the dentist to the technician by a method such as a shade guide number or a photograph, and the technician selects the paste of a plurality of colors based on the information, and then selects the prosthesis. Make it. Among these, regarding the transparency, as a paste for restoring the dentin part, the contrast ratio of the hardened body 1.0 mm thickness is 0.60 to 0.0 in accordance with the standard transparency range of the dentin part in the natural tooth. About 80 is adopted, and on the other hand, as the paste of the enamel part laminated thereon, the contrast ratio is about 0.30 to 0.50 in accordance with the standard transparency range of the enamel part. Is usually adopted.

  However, when a prosthesis is manufactured by combining the restoration paste for the dentin part having such transparency and the restoration paste for the enamel part, it is rich in unevenness, and furthermore, the enamel part of the surface layer and the deep layer Of course, it was difficult to reproduce the complexities of the color of natural teeth that differ slightly in color from one dentin to another. Furthermore, due to the influence of the difference in color appearance due to ambient light, it is difficult to transmit accurate color tone information. When the prosthesis thus has poor color tone reproduction, for example, the prosthesis feels white and has a sense of incongruity. Further, in cases where partial defects of teeth such as inlays and onlays are repaired, the boundary line between the natural tooth and the restoration becomes easy to distinguish, and it has been recognized as a case where color reproduction is difficult.

On the other hand, a method for producing a dental prosthesis having high aesthetics by using a resin-based material having a higher parallel-line transmittance than enamel in a portion corresponding to a dentin portion of a natural tooth has been proposed. (Patent Document 1). Specifically, as a paste for repairing the dentin part, the parallel line transmittance Tp ₁ is 35 to 60, and the paste for repairing the enamel part is 20 to 40, the parallel line transmittance Tp ₂ is Tp. ₁ -Tp ₂ is those 10 or more are used. The transparency of the paste for repairing the dentin part is higher than that of the paste for repairing the enamel part, and when converted to a contrast ratio of 1.0 mm thickness of the cured body, it is considered to be about 0.2 to 0.3. And a value having high transparency.

  Thus, since the restoration material formed by the paste for restoring the dentin portion becomes highly transparent as described above, the prosthesis obtained by this method takes in the color tone of the surrounding natural teeth in this portion. It becomes easy. Therefore, when the restoration site of the natural tooth is a shallow class I cavity, a prosthesis having a considerably good color compatibility with the natural tooth can be manufactured.

JP 2002-282280 A

  However, in the case of a case containing many deeper cavities and adjacent surfaces with natural teeth, in addition, an onlay case, a case with many missing parts such as a 4/5 crown, a case with a metal restoration on the adjacent tooth, and MOD In the case of cavity, the background color of the restoration part bottom surface or adjacent tooth wall surface is reflected too much, and the prosthesis looks totally dark or partly produces a gray zone. It was discovered that harmony was not achieved and sufficient color compatibility could not be obtained.

  Therefore, the present invention provides a kit for manufacturing a dental prosthesis that is optimal for achieving good color compatibility with natural teeth in many cases of inlays and onlays in spite of simple construction methods. Objective.

  The present inventors have intensively studied to solve the above problems. As a result, by constructing a dental prosthesis by laminating specific crown restoration materials with an optimal contrast ratio, it shows good color compatibility with natural teeth without appearing dark or floating white The headline and the present invention were completed.

That is, the present invention is a kit for producing a dental prosthesis having a laminated structure composed of a dentin partial restorative material and an enamel partial restorative material laminated thereon,
(A) A photocurable paste for partial dentin repair with a contrast ratio of 1.0 mm thickness of a cured body in the range of 0.45 to 0.55 for forming the dentin partial repair material, and (B) the above A photocurable paste for enamel partial repair having a contrast ratio of a cured body of 1.0 mm thickness in the range of 0.30 to 0.40 for forming an enamel partial repair material, at least. A dental prosthesis manufacturing kit.

Furthermore, the present invention provides (A) a cured body layer using a photocurable paste for partial dentine repair in which the contrast ratio of the cured body 1.0 mm thickness is in the range of 0.45 to 0.55,
(B) A dental prosthesis characterized by forming a cured body layer using a photocurable paste for partial restoration of enamel having a contrast ratio of 1.0 mm thickness of a cured body in the range of 0.30 to 0.40. A manufacturing method is also provided.

  If the kit of this invention is used, the dental prosthesis obtained will become a thing excellent in the color tone compatibility with respect to a natural tooth. This is well demonstrated in cases of deep cavities, in particular cavities deeper than 2 mm, the prosthesis does not appear dark or white, and is in good harmony with natural teeth. Indicates. In addition, the above-mentioned effect is exhibited well even in cases that include many adjacent surfaces with natural teeth, such as inlay cases, onlay cases, cases with many missing parts such as 4/5 crowns, metal on adjacent teeth. It can be suitably used in a case having a restoration and a case of a MOD cavity.

  Therefore, it can be applied to a wide variety of inlay and onlay cases with a small number of color tones, and is easy to create. Therefore, it is extremely useful as a dental restoration kit that can efficiently produce a prosthesis with high aesthetics.

  In the present invention, the contrast ratio is a scale representing transparency, and is calculated using the Y value related to brightness among the tristimulus values of the XYZ color system defined in JIS Z8701. Specifically, a black background or a white background is brought into contact with a 1.0 mm thick sample plate, and the Y value in the reflected light when standard light C is irradiated is read. The contrast ratio (C) can be obtained from Yb / Yw where Yb is Yb for a black background and Yw is Yw for a white background. A C value closer to 1 indicates an opaque material, and a value closer to 0 indicates a transparent material.

  The contrast ratio of the restoration material is an important factor in the restoration of the color tone compatibility with natural teeth in dental prostheses, especially in cases where partial tooth defects such as inlays and onlays are repaired. . In other words, in the case of inlays and onlays, the boundary line with the surrounding natural teeth becomes clear and it becomes easy to distinguish between the two, so we will endeavor to match the color and intensity of the prosthesis itself to the natural teeth. Rather than taking in the surrounding color tone more positively, it is advantageous for color tone matching. Furthermore, since these forms are complicated and various cavity shapes are assumed depending on the case, the influence of the background color changes depending on the observation direction, and the appearance differs, so the transparency of the material, that is, the contrast ratio Is important.

Under such circumstances, the dental prosthesis manufacturing kit in the present invention is
(A) A photocurable paste for partial dentin repair with a contrast ratio of 1.0 mm thickness of a cured body in the range of 0.45 to 0.55 for forming the dentin partial repair material, and (B) the above It is configured to include a photocurable paste for partial restoration of enamel in which the contrast ratio of a cured body of 1.0 mm thickness for forming an enamel partial restoration material is in the range of 0.30 to 0.40. Here, it is extremely important that the photocurable paste (A) for partial dentin repair has the value of the contrast ratio. That is, as described above, according to the standard transparency range of the dentin part in the natural tooth, this photocurable paste for repairing the dentin part has a contrast ratio of the cured body of about 0.60 to 0.80. It is normal to use the one. However, in this case, in cases where partial tooth defects such as inlays and onlays are repaired, the prosthesis is difficult to reproduce the complexity of the natural tooth color, and even at the boundary with the natural teeth. It is inevitable that the color will be different.

  On the other hand, instead of matching the color tone of the prosthesis itself to the natural tooth in this way, the photocurable paste for partial dentin repair is aimed at improving the compatibility by actively incorporating the surrounding color tone. As a result, even if a highly transparent material with an extremely small contrast ratio is used, if the subject includes a deep cavity or an adjacent surface, the depth and background color will be reflected too much and the prosthesis will appear dark overall become.

  On the other hand, if the hardened body has a contrast ratio in the range of 0.45 to 0.55, such as the photocurable paste for partial dentine repair (A), the transparency of natural teeth and In a situation having relatively close transparency, the surrounding color tone is also taken in moderately, and these actions work synergistically to significantly improve the color tone compatibility with the surrounding natural tooth. As a result, it is possible to manufacture prostheses that are widely harmonized with the surrounding natural teeth depending on various situations, from cases of simple shallow cavities in the inlay to cases including deep cavities and surfaces adjacent to natural teeth. In particular, the contrast ratio of the cured body in the photocurable paste (A) for partial dentin repair is more preferably in the range of 0.47 to 0.52.

  When the contrast ratio of the photocurable paste (A) for partial dentin repair is less than 0.45, the prosthesis looks dark in the oral cavity, which is not preferable. When this contrast ratio is larger than 0.55, the color tone compatibility is deteriorated such that the prosthesis appears to be whitish in the oral cavity, which is not preferable.

  In the present invention, the photocurable paste (B) for partial restoration of enamel has a contrast ratio of 0.30 to 0.40 in accordance with the standard transparency range of the enamel part in natural teeth. Thus, since it has almost the same transparency as the highly transparent enamel part forming the surface layer part of the tooth, the prosthesis manufactured by the kit of the present invention has the optimum color tone compatibility in the part. is there. The contrast ratio of the cured product in the photocurable paste for enamel partial repair (B) is more preferably in the range of 0.32 to 0.38.

  When the contrast ratio of the photocurable paste for partial enamel repair (B) is less than 0.30, the transparency is strong and the dark finish is not preferable. When this contrast ratio is larger than 0.40, there is little difference in transparency between the inside of the restoration and the surface layer, and the texture becomes monotonous.

  In the present invention, each of the above-mentioned photocurable pastes (A) and (B) is not particularly limited as long as the contrast ratio is in each specific range, and is selected from conventional dental photocurable pastes. That's fine. As a general photocurable paste, a composite resin composed of a filler, a polymerizable monomer, and a photopolymerization initiator is used.

  Fillers include amorphous silica, silica-zirconia, silica-titania, quartz, alumina, barium glass, colloidal silica and other inorganic powders, or surface treated products with silane coupling agents, organic powders, organic Inorganic composite powders are used, and spherical composite oxides that can be produced by the methods described in, for example, JP-A Nos. 58-110414 and 58-156524 are particularly preferable.

  As the polymerizable monomer that can be suitably used, a known monomer whose cured product becomes a transparent resin can be used, and in general, a polymerizable monomer having an acryloyl group and / or a methacryloyl group can be mentioned. Specifically, each monomer shown by the following [I-1]-[I-4] is mentioned.

[I-1] Monofunctional vinyl monomer: Methacrylate such as methyl methacrylate, ethyl methacrylate, isopropyl methacrylate, hydroxyethyl methacrylate, tetrahydrofurfuryl methacrylate, glycidyl methacrylate, and acrylates corresponding to these methacrylates; or acrylic acid, methacrylic acid, p-methacryloyloxybenzoic acid, N-2-hydroxy-3-methacryloyloxypropyl-N-phenylglycine, 4-methacryloyloxyethyl trimellitic acid and its anhydride, 6-methacryloyloxyhexamethylenemalonic acid, 10-methacryloyl Oxydecamethylenemalonic acid, 2-methacryloyloxyethyl dihydrogen phosphate, 10-methacryloyloxydecame Chilene hydrogen phosphate, 2-hydroxyethyl hydrogen phenyl phosphonate, etc.

[I-2] Bifunctional vinyl monomer (i) Aromatic compound-based 2,2-bis (methacryloyloxyphenyl) propane, 2,2-bis [4- (3-methacryloyloxy) -2-hydroxypropoxy Phenyl] propane, 2,2-bis (4-methacryloyloxyphenyl) propane, 2,2-bis (4-methacryloyloxypolyethoxyphenyl) propane, 2,2-bis (4-methacryloyloxydiethoxyphenyl) propane) 2,2-bis (4-methacryloyloxytetraethoxyphenyl) propane, 2,2-bis (4-methacryloyloxypentaethoxyphenyl) propane, 2,2-bis (4-methacryloyloxydipropoxyphenyl) propane, 2, (4-Methacryloyloxydiethoxyphenyl)- (4-Methacryloyloxydiethoxyphenyl) propane, 2 (4-methacryloyloxydiethoxyphenyl) -2 (4-methacryloyloxyditriethoxyphenyl) propane, 2 (4-methacryloyloxydipropoxyphenyl) -2- (4- Methacryloyloxytriethoxyphenyl) propane, 2,2-bis (4-methacryloyloxypropoxyphenyl) propane, 2,2-bis (4-methacryloyloxyisopropoxyphenyl) propane, and acrylates corresponding to these methacrylates; Methacrylates such as hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, 3-chloro-2-hydroxypropyl methacrylate, or acrylates corresponding to these methacrylates A vinyl monomer having a -OH group such as bets, diisocyanate methyl benzene, diadduct and the like obtained from the addition of the diisocyanate compound having an aromatic group such as 4,4'-diphenylmethane diisocyanate.

(Ii) Aliphatic compound-based ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, triethylene glycol dimethacrylate, butylene glycol dimethacrylate, neopentyl glycol dimethacrylate, propylene glycol dimethacrylate, 1,3-butanediol dimethacrylate, 1 , 4-butanediol dimethacrylate, 1,6-hexanediol dimethacrylate, and acrylates corresponding to these methacrylates; methacrylates such as 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, 3-chloro-2-hydroxypropyl methacrylate Alternatively, vinyl monomers having —OH groups such as acrylates corresponding to these methacrylates and hex Diadducts obtained from addition with diisocyanate compounds such as methylene diisocyanate, trimethylhexamethylene diisocyanate, diisocyanate methylcyclohexane, isophorone diisocyanate, methylenebis (4-cyclohexylisocyanate), for example 1,6-bis (methacrylethyloxycarbonylamino)- 2,2-4-trimethylhexane; acrylic anhydride, methacrylic anhydride, 1,2-bis (3-methacryloyloxy-2-hydroxypropoxy) ethyl, di (2-methacryloyloxypropyl) phosphate, and the like.

[I-3] Trifunctional vinyl monomers such as trimethylolpropane trimethacrylate, trimethylolethane trimethacrylate, pentaerythritol trimethacrylate, trimethylolmethane trimethacrylate, and other methacrylates, and acrylates corresponding to these methacrylates.

[I-4] Tetrafunctional vinyl monomers pentaerythritol tetramethacrylate, pentaerythritol tetraacrylate and diisocyanate methylbenzene, diisocyanate methylcyclohexane, isophorone diisocyanate, hexamethylene diisocyanate, trimethylhexamethylene diisocyanate, methylene bis (4-cyclohexyl isocyanate), 4 Diadducts obtained from the addition of diisocyanate compounds such as 1,4-diphenylmethane diisocyanate and tolylene-2,4-diisocyanate and glycidol dimethacrylate.
Among them, 2,2-bis [4- (3-methacryloyloxy) -2-hydroxypropoxyphenyl] propane (hereinafter abbreviated as bis-GMA), 2,2-bis (4-methacryloyloxypoly) Ethoxyphenyl) propane (hereinafter abbreviated as bis-MPEPP), triethylene glycol dimethacrylate (hereinafter abbreviated as TEGDMA), 1,6-bis (methacrylethyloxycarbonylamino) -2,2-4-trimethylhexane Polyfunctional methacrylates such as (hereinafter abbreviated as UDMA) are preferred, and these are used alone or in admixture of two or more.

  As the photopolymerization initiator, camphorquinone, 2,4,6-trimethylbenzoyldiphenylphosphine oxide, bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide, or the like is used. A secondary amine or the like is added. Moreover, known additives such as a polymerization inhibitor and an ultraviolet absorber can be added without limitation as required.

  The mixing ratio of these components is generally 200 to 1900 parts by weight, more preferably 300 to 900 parts by weight, and 0.01 to 5 photopolymerization initiator for 100 parts by weight of the polymerizable monomer. From the range of parts by weight, more preferably from 0.1 to 5 parts by weight, the contrast ratio of the cured product, which will be described later, and other adjustments of physical properties such as mechanical strength of the cured product may be taken into consideration.

  The contrast ratio of the cured product in such a photocurable paste can be adjusted by changing the refractive index, particle size, blending amount, refractive index of the polymerizable monomer, and the like. For example, the contrast ratio of the cured product of the photocurable paste is usually determined by the difference between the refractive index of the filler and the refractive index of the cured product of the matrix containing the polymerizable monomer. The greater the difference, the more opaque it can be.

  At this time, the absolute value of the difference between the refractive index of the matrix containing the polymerizable monomer before curing and the refractive index of the filler, and the absolute value of the difference between the refractive index of the matrix after curing and the refractive index of the filler It is preferable to adjust the difference so as to be small. This is to make the change in transparency small before and after polymerization and to make it easier to confirm the color tone of the final restoration of the crown while building up.

  In this way, in the method of adjusting the contrast ratio by changing the composition of the main component filler and polymerizable monomer, the influence on other physical properties such as mechanical strength and operability becomes large. The design may not be easy. In such a case, the absolute value of the difference in refractive index of the cured product of the matrix containing the filler and the polymerizable monomer is approximately 0.1 or less, preferably approximately 0.05 or less. By adjusting the basic paste so that the contrast ratio of the cured product obtained by polymerizing and curing the paste is sufficiently low, preferably the contrast ratio is 0.25 or less, and adding a pigment as appropriate thereto Only the contrast ratio can be adjusted.

  Specifically, the contrast ratio can be easily increased by adding a pigment having a high refractive index such as titanium oxide, zinc white, or zirconium oxide. In many cases, the color tone of a pigment changes greatly when added in a small amount. Therefore, in order to control the amount of pigment added, it is necessary to use a pigment master that has been dispersed in an appropriate diluent in advance. It is effective.

  In addition, since the dental prosthesis manufactured using the kit of the present invention has a characteristic of appropriately picking up the color tone of the surrounding natural teeth, it can be applied to the restoration of natural teeth of various wider colors with the same color tone. However, it is more preferable that the dental prosthesis itself has a color tone similar to that of natural teeth. As an example of a preferable color tone range, a colorimetric value of a 1.0 mm cured body in the CIELab color system under a white background condition indicates that L * is 55 to 55 for the photocurable paste (A) for dentin partial restoration. 75, a * is preferably in the range of -2.0 to 3.0, and b * is preferably in the range of 0 to 30. Moreover, about the photocurable paste (B) for enamel partial repair, L * is in the range of 65 to 85, a * is in the range of -3.0 to 2.0, and b * is in the range of -5.0 to 25. Is preferred.

  Each of the above-mentioned photocurable pastes (A) and (B) is generally produced by taking a predetermined amount of each of the above-mentioned constituent components, mixing them, and vacuum defoaming. The photocurable paste thus obtained may be stored in a light-shielding container and stored and distributed. Examples of the container include a syringe, a compute, a lidded lid, and the like. .

  Next, a general method of using the dental prosthesis manufacturing kit according to the present invention will be described. First, an impression of the cavity shape in the oral cavity is collected using a dental impression material or the like, and a plaster abutment model is prepared based on the impression. A gypsum curing material or a gypsum separating material is applied to this as needed, and then the photocurable paste (A) for dentin partial repair is built in the cavity. This photocurable paste (A) layer for partial dentin repair is left uncured, and further a photocurable paste (B) layer for enamel partial repair is laminated thereon, and the (A) layer and (B ) Layer may be cured at the same time using a light irradiator, but usually this was obtained after complete or preliminary photocuring of only the photocurable paste (A) layer for partial dentin repair It is efficient from the viewpoint of workability to laminate the photocurable paste (B) layer for enamel partial repair on the cured body layer and to photocure it.

  In this way, a dental prosthesis having a laminated structure as shown in FIG. 1 is manufactured. That is, FIG. 1 is a schematic cross-sectional view of a typical dental prosthesis obtained using the kit of the present invention (an onlay case). In the cavity of the abutment model 1, light curing for partial dentin repair is performed. From a dentin partial restorative material layer 2 made of a cured product of an adhesive paste (A) and an enamel partial restorative material layer 3 made of a cured product of a photocurable paste (B) for enamel partial repair laminated thereon A dental prosthesis 4 is formed.

  Here, in the kit for manufacturing a dental prosthesis according to the present invention, the application portion of the photocurable paste (A) for partial dentine repair is a portion corresponding to the dentin in the portion where the tooth is repaired, while the partial restoration of the enamel The application part of the photocurable paste for medical use (B) is an enamel-equivalent part of the part where the tooth is restored. However, the boundaries do not necessarily need to be exactly coincident, and it is tolerable that each layer is somewhat thicker or thinner than the corresponding dentin or enamel portion of the tooth. In general, the thickness of the photocurable paste (A) layer for partial dentin repair is 50 to 90% of the total thickness of the prosthesis.

  In the dental prosthesis 4, the dentin partial restoration material layer 2 and the enamel partial restoration material layer 3 are mostly directly laminated, but the tooth discoloration is severe or partial. If there is a part that wants to give a texture closer to natural teeth, add a photo-curable paste of any color tone between the two layers in that part. A layer may be provided to enhance aesthetics. In this case, the area where the dentin partial restorative material layer 2 and the enamel partial restorative material layer 3 are directly laminated occupies 50% or more of the entire boundary surface, more preferably 70% or more. Is preferred. Assuming the above use mode, the kit for producing a prosthesis according to the present invention includes the photocurable paste for partial dentin repair (A) and the photocurable paste for partial enamel repair (B). Such a photocurable paste for coloring is also preferably included in the component.

  Similarly, in the kit of the present invention, a photocurable paste having an arbitrary contrast ratio may be included as a component, and other metal color shielding paste, gypsum separator, abrasive, etc. Both members necessary for manufacturing the dental prosthesis may be included as components.

EXAMPLES Hereinafter, although an Example demonstrates this invention concretely, this invention is not restrict | limited to these Examples. In addition, the polymerizable monomer, photoinitiator, and filler which were used by the Example and the comparative example are as follows.
(1) Filler F-1: 60 parts by weight of spherical silica-zirconia (average particle size: 0.4 micron) and 40 parts by weight of fine particle silica-titania (average particle size: 0.07 micron) are mixed and pulverized What was surface-treated with γ-methacryloyloxypropyltrimethoxysilane. Refractive index 1.52
F-2: A product obtained by subjecting amorphous silica zirconia (average particle size; 1.2 microns) to surface treatment with γ-methacryloyloxypropyltrimethoxysilane. Refractive index 1.53
F-3: A fine particle colloidal silica (average particle size: 0.02 micron) subjected to surface treatment with γ-methacryloyloxypropyltrimethoxysilane. Refractive index 1.47
F-4: Organic-inorganic composite filler, bis-GMA 40 parts by weight, TEGDMA 60 parts by weight, azobisisobutyronitrile 1 part by weight, F-1 300 parts by weight, mixed, degassed, thermally polymerized, pulverized, Surface treated, average particle size 30 microns. Refractive index 1.52
(2) Polymerizable monomer composition M-1: bis-MPEPP (70) / TEGDMA (15) / UDMA (15)
Refractive index of cured body 1.55
M-2: bis-GMA (60) / TEGDMA (40)
Refractive index of cured body 1.55
M-3: UDMA (80) / TEGDMA (20)
Refractive index of cured body 1.51
(3) Photopolymerization initiator C-1: bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide C-2: camphorquinone C-3: dimethylaminobenzoic acid ethyl ester (4) additive -I-1: Hydroquinone monomethyl ether In addition, in the present Example and the comparative example, each item was evaluated with the following method.
(1) Color difference Using VITAPAN classical (trade name, manufactured by Vita) as a shade guide, a simulated cavity containing adjacent surfaces on the tabs of A2, A3, and B2 was prepared, and two of each of the light-curing pastes adjusted for this The types were used and combined in a ratio of paste (A): paste (B) = 8: 2 to perform filling, curing and polishing, respectively. A simulated cave restoration of a shade guide was photographed using a digital camera, and the color tone of the shade guide portion adjacent to each other and the cured body portion of the photocurable paste was obtained by image analysis, and the color difference ΔEab in the CIELab color system * Was calculated.
(2) Color tone compatibility An impression was taken according to the conventional method for a class II cavity including the buccal side adjacent surface of the lower right sixth molar. As a result of shade taking, the color tone was equivalent to A3 in the shade guide VITAPAN classical music. A dental prosthesis that uses two types of pastes prepared for the cavity of a gypsum model based on the impression, and is cured by combining them in a ratio of paste (A): paste (B) = 8: 2. Was made. The prepared dental prosthesis was mounted on the cavity under wet conditions, and visually observed for harmony with the tooth quality, and the following three-stage evaluation was performed. A: The color of the restoration is well matched with natural teeth. B: The color of the restoration is similar to that of natural teeth, but the compatibility is not good. C: The difference between the restoration and the natural tooth is clear.

Example 1
In advance, 100 g of a matrix monomer M-1 in which C-1 was dissolved by 1% by weight and I-1 was dissolved by 0.05% by weight and 400 g of F-1 were mixed and kneaded to prepare a photocurable paste. For this, titanium oxide, pigment yellow, pigment red, pigment blue, and carbon black are used as pigments, and the paste having the contrast ratio and color tone L *, a *, and b * shown in Table 1 by adjusting the addition amount. Was made. A color difference meter TC-1800mkII made by Tokyo Denshoku was used for the measurement of contrast ratio and color tone L *, a *, b *.

  This was defoamed to prepare photocurable pastes 1 and 2. The photocurable paste 1 was used as a photocurable paste (A) for partial dentin repair, and the photocurable paste 2 was used as a photocurable paste (B) for partial enamel repair, and various evaluations were performed by the methods described above. . The results are shown in Table 2.

Examples 2-5
Photocurable pastes 3 to 10 were prepared in the same manner as in Example 1 using the filler, the polymerizable monomer composition, and the polymerization initiator shown in Table 1, respectively, and the combinations shown in Table 2 Various evaluations were performed by the methods described above. The results are shown in Table 2.

Comparative Examples 1-5
Photocurable pastes 11 and 12 were produced in the same manner as in Example 1 using the filler, the polymerizable monomer composition, and the polymerization initiator shown in Table 1, respectively. In the combinations shown in Table 2, various evaluations were performed by the methods described above. The results are shown in Table 2.

It is a cross-sectional schematic diagram of the prosthesis of the typical aspect obtained using the kit for dental prosthesis manufacture of this invention.

Explanation of symbols

1: Abutment model 2: Dentin partial restoration material layer made of cured material of photocurable paste (A) for partial dentin repair 3: Enamel made of cured material of photocurable paste (B) for partial restoration of enamel Partial restoration material layer 4: Prosthesis

Claims (4)

A kit for manufacturing a dental prosthesis having a laminated structure comprising a dentine partial restorative material and an enamel partial restorative material laminated thereon,
(A) A photocurable paste for partial dentin repair with a contrast ratio of 1.0 mm thickness of a cured body in the range of 0.45 to 0.55 for forming the dentin partial repair material, and (B) the above A photocurable paste for enamel partial repair having a contrast ratio of a cured body of 1.0 mm thickness in the range of 0.30 to 0.40 for forming an enamel partial repair material, at least. A dental prosthesis manufacturing kit. The colorimetric values of the 1.0 mm cured body in the CIELab color system under the white background condition are as follows: L * is 55 to 75 and a * is −2.0 for the photocurable paste (A) for dentin partial restoration. -3.0, b * is in the range of 0-30, and for the photocurable paste for enamel partial repair (B), L * is 65-85, a * is -3.0-2.0, The dental prosthesis manufacturing kit according to claim 1, wherein b * is in the range of -5.0 to 25. The dental prosthesis manufacturing kit according to claim 1 or 2, wherein the dental prosthesis is for inlay or onlay. (A) On the cured body layer using the photocurable paste for partial dentine repair in which the contrast ratio of the cured body 1.0 mm thickness is in the range of 0.45 to 0.55,
(B) A dental prosthesis characterized by forming a cured body layer using a photocurable paste for partial restoration of enamel having a contrast ratio of 1.0 mm thickness of a cured body in the range of 0.30 to 0.40. Production method.

Images