Abstract: The present invention relates to a composite material which can be used as a dental prosthesis device (crown, bridge), and specifically, relates to a composite material including a curable resin and a fiber material, and more specifically relates to a block-like composite material for dental cutting and processing characterized by having a multilayered structure including at least two layers having different transparencies. There are no technical information relating to a color tone and a transparency of the fiber material. To provide a block-like composite material for dental cutting and processing, wherein the block-like composite material has a multilayered structure including at least two layers having different transparencies, and the each layer includes a curable resin and a fiber material.

Abstract: The present invention provides a dental curable composition comprising (A) a polymerizable monomer, (B) an inorganic filler, and (C) a polymerization initiator, wherein the polymerizable monomer (A) comprises (a1) a polyfunctional (meth)acrylate monomer comprising urethane bonds, (a2) a polyfunctional (meth)acrylate monomer comprising hydroxyl groups, and (a3) a polyfunctional (meth)acrylate monomer comprising carboxyl groups, the ratio by weight of (a1):(a2)+(a3) ranges from 1:1 to 9:1, the number of hydroxyl groups is not more than 0.5 relative to the number of (meth)acryloyl groups in one molecule of the above-mentioned (a2), and the number of carboxyl groups is not more than 0.5 relative to the number of (meth)acryloyl groups in one molecule of the above-mentioned (a3).

Abstract: To provide a dental lithium silicate glass composition capable of providing a dental lithium silicate glass ceramic capable of efficiently precipitating the main crystals (lithium disilicate and/or lithium metasilicate) even after heat treatment. To provide a Al2O3-free dental lithium silicate glass composition including the following components: SiO2: 60.0 to 80.0% by weight, Li2O: 10.0 to 17.0% by weight, K2O: 0.5 to 10.0% by weight, ZrO2: 0.0 to 5.0% by weight, a nucleating agent: 1.0 to 6.0% by weight, a glass stabilizer: 0.0 to 8.0% by weight and a colorant: 0.0 to 10.0% by weight.

Abstract: Provided are dental polymerizable monomers that can give cured products having high toughness and high rigidity, dental polymerizable monomer compositions containing the polymerizable monomers, and dental compositions containing the dental polymerizable monomer compositions, and cured products thereof having high mechanical properties. The dental polymerizable monomer (A) which includes a urethane acrylate obtained from an appropriately rigid diisocyanate and an appropriately flexible hydroxyacrylate is used to prepare a dental polymerizable monomer composition containing the dental polymerizable monomer, and a dental composition containing the dental polymerizable monomer composition.

Abstract: Provided are dental polymerizable monomer compositions that can give cured products having high toughness and high rigidity, and dental compositions containing such dental polymerizable monomer compositions and cured products thereof having high mechanical properties.

Abstract: The present invention provides a dental curable composition used for dental filling restorative materials, dental crown prosthesis materials such as inlays, crowns, and bridges, materials for constructing anchor teeth, block materials for dental CAD/CAM, etc. More specifically, the present invention provides a dental curable composition comprising a curable resin (A), a porous inorganic filler (B), and a polymerization initiator (C), wherein the porous inorganic filler (B) comprises a silicon dioxide, and an oxide comprising at least one kind of the other metallic elements, and a ratio (I1/I2) of a maximum absorbance (I1) of 3730 to 3750 cm?1 to a maximum absorbance (I2) of 3000 to 3600 cm?1 in infrared absorption spectrum of the porous inorganic filler (B), is not less than 1 and not more than 3.

Abstract: To provide a multilayer resin material for dental milling and machining, comprising an inorganic filler in a content of 40% by weight or more and a plurality of layers different in transparency and color tone from each other, wherein the thickness of the uppermost layer (U) and the thickness of the lowermost layer (L) are each 1 mm or more, the contrast ratios (uppermost layer: CU, lowermost layer: CL) as indices for the transparency of the uppermost layer (U) and the transparency of the lowermost layer (L) satisfy the following relations: 0.30?CU?0.60 0.55?CL?0.

Abstract: To provide a dental lithium silicate glass composition capable of providing a dental lithium silicate glass ceramic capable of efficiently precipitating the main crystals (lithium disilicate and/or lithium metasilicate) even after heat treatment. To provide a Al2O3-free dental lithium silicate glass composition including the following components: SiO2: 60.0 to 80.0% by weight, Li2O: 10.0 to 17.0% by weight, K2O: 0.5 to 10.0% by weight, ZrO2: 0.0 to 5.0% by weight, a nucleating agent: 1.0 to 6.0% by weight, a glass stabilizer: 0.0 to 8.0% by weight and a colorant: 0.0 to 10.0% by weight.

Abstract: Provided are opaque materials exhibiting a good adhesive strength and a good color tone reproduction comparable with natural dental crowns as well as having a good operability. In addition, the opaque materials may exhibit a stain-resistance property in rebuilding-up a dental composition on the opaque materials in a cured form with a metal instrument. Further, the opaque materials may exhibit a good color tone reproduction comparable with natural dental crowns even if a dental membrane is thinly formed from the opaque metals. The dental membrane is formed from a first opaque layer and a second opaque layer, wherein the first opaque layer contains a filler of indefinite-shape particles and the second opaque layer contains a filler of spherical-shape particles, and wherein the first opaque layer is formed on a metal base and the second opaque layer is formed on the first opaque layer.

Abstract: A dental coloring material composition comprising containing: (a) a polymerizable monomer and/or an oligomer, (b) a polymerization catalyst, and (c) a pigment and/or a dye, wherein a color tone thereof is a cyan color based on three subtractive primary colors, or a color tone thereof is a magenta color based on three subtractive primary colors, or a color tone thereof is a yellow color based on three subtractive primary colors, and a dental color material set using the dental coloring material compositions in combination.

Abstract: Disclosed is a dental composition comprising 0.01 to 10 parts by weight of at least one kind of (a) a visible light-photopolymerization catalyst compound and one or more kinds of (b) di(meth)acrylate compounds represented by the general formula (I): wherein R1 and R2 each independently represent hydrogen or a methyl group, and a repeating unit number n of an ethylene oxide group is from 9 to 50.

Abstract: An object of the present invention is to provide a photopolymerizable dental composition which causes less change in a color tone before and after curing and exhibits excellent photopolymerizability to irradiation in a wide wavelength range, and has also excellent thin-layer surface curability, and to provide a photopolymerization initiator used therefor. Disclosed is a visible light-polymerizable dental composition which does not substantially contain an amine compound as a photosensitizer, comprising 0.01 to 10 parts by weight of a (bis)acylphosphine oxide compound, 0.01 to 10 parts by weight of an ?-diketone compound and 100 parts by weight of a polymerizable monomer.

Abstract: A dental coloring material composition comprising containing: (a) a polymerizable monomer and/or an oligomer, (b) a polymerization catalyst, and (c) a pigment and/or a dye, wherein a color tone thereof is a cyan color based on three subtractive primary colors, or a color tone thereof is a magenta color based on three subtractive primary colors, or a color tone thereof is a yellow color based on three subtractive primary colors, and a dental color material set using the dental coloring material compositions in combination.

Abstract: An object of the present invention is to provide a photopolymerizable dental composition which causes less change in a color tone before and after curing and exhibits excellent photopolymerizability to irradiation in a wide wavelength range, and has also excellent thin-layer surface curability, and to provide a photopolymerization initiator used therefor. Disclosed is a visible light-polymerizable dental composition which does not substantially contain an amine compound as a photosensitizer, comprising 0.01 to 10 parts by weight of a (bis)acylphosphine oxide compound, 0.01 to 10 parts by weight of an ?-diketone compound and 100 parts by weight of a polymerizable monomer.

Abstract: An object of the present invention is to provide a dental composition with less change of color tone before and after curing and less color change after curing, and also with excellent thin-layer surface curability. Disclosed is a dental composition comprising 0.01 to 10 parts by weight of at least one kind of (a) a visible light.-photopolymerization catalyst compound and one or more kinds of (b) di(meth)acrylate compounds represented by the general formula (I): wherein R1 and R2 each independently represent hydrogen or a methyl group, and a repeating unit number n of an ethylene oxide group is from 9 to 50.

Abstract: ABSTRACT OF THE DISCLOSURE A dental composite material comprising (A) a polymerizable monomer, (B) a filler comprising at least one heat-treated aggregate of silica and at least one metal oxide other than silica, wherein the aggregate has an average particle size of 0.5-30 &mgr;m, a refractive index of 1.46-1.65, a pore volume of 0.1-1.0 cc/g, a BET specific surface area of 50-500 m2/g, and a primary particle size of 1-250 nm, and (C) a polymerization initiator. The dental composite material of the present invention can satisfy various kinds of properties required as a dental composite material simultaneously.