Patents Assigned to Kuraray Medical, Inc.
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Publication number: 20120202913Abstract: The present invention provides a dental adhesive material kit having excellent bond durability. The present invention is represented by a dental adhesive material kit containing a dental aqueous adhesive composition (A) and a multi-part type dental nonaqueous curable composition (B). The dental aqueous adhesive composition (A) contains a polymerizable monomer (a) having an acidic group, an aliphatic polymerizable monomer (b) having no acidic group, water (c), and an amine-based reducing agent (d1) containing no sulfur atom. The multi-part type dental nonaqueous curable composition (B) contains an aliphatic polymerizable monomer (b) having no acidic group, an aromatic polymerizable monomer (e) having no acidic group, a powdery water-soluble reducing compound (f) containing a sulfur atom, an organic peroxide (g), and an amine-based reducing agent (d2) containing no sulfur atom.Type: ApplicationFiled: March 25, 2011Publication date: August 9, 2012Applicant: KURARAY MEDICAL INC.Inventors: Michiya Kawana, Hidemi Nakayama, Mitsuru Takei, Kenji Suzuki, Ai Hinamoto
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Publication number: 20120196952Abstract: The present invention provides a polymerizable composition that is suitably used as a temporary cement for implant use and a mobile tooth-fixing material. The present invention is a polymerizable composition that includes an acrylic block copolymer (a) having at least one polymer block A that mainly contains a (meth)acrylic acid ester unit and that functions as a hard segment and at least one polymer block B that mainly contains an acrylic acid ester unit and that functions as a soft segment, a polymerizable monomer (b), and a polymerization initiator (c).Type: ApplicationFiled: October 19, 2010Publication date: August 2, 2012Applicant: Kuraray Medical Inc.Inventor: Kenji Suzuki
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Patent number: 8147807Abstract: A dental composition for oral use, containing a phosphorylated saccharide (a), a cationic bactericidal agent (b) and a solvent (c). By using the dental composition for oral use of the present invention, the adhesion of the bacteria in the oral cavity to the surfaces of the teeth can be suppressed for a long period of time; therefore, the dental composition for oral use can be suitably used for, for example, a mouse-wash agent, a dentifrice agent, a gargling agent, a mouse spray, a coating agent or a bonding agent to tooth surface or a dental prosthetic, a hypersensitive inhibitor, a therapeutic agent for periodontal diseases, that is applied to a periodontal pocket, or the like.Type: GrantFiled: July 18, 2007Date of Patent: April 3, 2012Assignees: National University Corporation Okayama University, Kuraray Medical Inc.Inventors: Yasuhiro Yoshida, Naoko Namba, Noriyuki Nagaoka, Kaori Yoshimoto, Shogo Takashiba, Kazuomi Suzuki, Hiroshige Ishino, Takahiro Sekiguchi, Koichi Okada
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Patent number: 8148571Abstract: A novel compound (I) represented by the following formula (1) is provided which is suitable for a dental composition and has a polymerizable group, a carboxyl group and a phosphoric acid group. A method for producing a polymerizable amide is provided, which method can make a condensation reaction of a carboxylic acid with an amine to proceed easily and is excellent in safety: wherein R1, R2 and R3 each independently are a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms which may have a substituent; (A) and (B) are each any constituent unit; m is an integer of from 1 to 3; n is an integer of from 1 to 3; R4 is an organic group having 1 to 40 carbon atoms which may have a substituent; R5 is a hydrocarbon group having 1 to 20 carbon atoms which may have a substituent, R6 and R7 each independently are a hydrogen atom, a hydrocarbon group having 1 to 20 carbon atoms which may have a substituent, or a metal atom.Type: GrantFiled: September 27, 2007Date of Patent: April 3, 2012Assignee: Kuraray Medical Inc.Inventors: Takahiro Sekiguchi, Ai Hinamoto
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Patent number: 8124669Abstract: A composition for dental use containing a polymerizable monomer (a) having an aromatic ring and a hydroxyl group, a polymerizable monomer (b) having an aromatic ring without having any hydroxyl groups, and a polymerizable monomer (c) other than the polymerizable monomers (a) and (b), wherein the composition for dental use contains the polymerizable monomers (a), (b), and (c) in an amount of from 10 to 30% by weight, from 50 to 70% by weight, and from 10 to 30% by weight, respectively, of all the polymerizable monomers. The composition for dental use of the present invention can be suitably used as a product capable of substituting a part or all of a natural tooth in the field of dental therapy.Type: GrantFiled: February 5, 2008Date of Patent: February 28, 2012Assignee: Kuraray Medical Inc.Inventors: Eiichi Terakawa, Akiko Ota, Takahiro Sekiguchi
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Publication number: 20120027829Abstract: A dentin mineralizing agent comprising tetracalcium phosphate particles (A) and an alkali metal salt of phosphoric acid (B), wherein the dentin mineralizing agent contains the tetracalcium phosphate particles (A) in an amount of 1 to 80 parts by weight relative to 100 parts by weight of the whole amount of the dentin mineralizing agent, and the blended amount of the alkali metal salt of phosphoric acid (B) relative to 100 parts by weight of the tetracalcium phosphate particles (A) is 1 to 100 parts by weight. Thus is provided a dentin mineralizing agent by which a dense HAp is formed on a dentin surface and HAp is deposited to a deep portion of a dentinal tubule, so that it can close the dentinal tubule.Type: ApplicationFiled: March 26, 2010Publication date: February 2, 2012Applicant: Kuraray Medical Inc.Inventors: Tadashi Hashimoto, Mariko Sugiura, Shumei Ishihara, Mitsunobu Kawashima, Koichi Okada
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Publication number: 20120016094Abstract: The present invention provides a redox-curing type composition that penetrates into a wet body, particularly into a tooth structure (dentin), is cured in an accelerated manner by the moisture contained in the wet body, thereby exhibits a higher bond strength than those of conventional redox-curing type compositions, and has satisfactory storage stability. The present invention is a redox-curing type composition including a polymerizable monomer (a) having an acidic group, a polymerizable monomer (b) having no acidic group, a powdery inorganic peroxide (c) with an average particle diameter of 0.01 to 50 ?m, an amine-based reducing agent (d), and a polymerization accelerator (e). The amine-based reducing agent (d) includes an aromatic amine (d?1) and an aliphatic amine (d?2), and a weight ratio (d?1):(d?2) therebetween is 5:1 to 1:50.Type: ApplicationFiled: March 1, 2010Publication date: January 19, 2012Applicant: Kuraray Medical Inc.Inventors: Mitsuru Takei, Mariko Sugiura
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Publication number: 20110257292Abstract: The present invention provides a dental curable composition exhibiting both excellent light diffusion and excellent transparency, and having high mechanical strength and surface smoothness and gloss after polishing as a cured product as well as good handling properties as a paste. The present invention is a dental curable composition including: a polymerizable monomer (A) having a refractive index of 1.52 to 1.58 after polymerization; inorganic particles (B) having a refractive index of 1.43 to 1.50; and inorganic particles (C) having a refractive index of 1.52 to 1.58. The inorganic particles (B) are aggregates of inorganic fine particles having an average primary particle size of 2 to 50 nm, and the content of the inorganic particles (B) is 0.1 to 10% by weight.Type: ApplicationFiled: December 10, 2010Publication date: October 20, 2011Applicant: KURARAY MEDICAL INC.Inventors: Masaki Okubayashi, Hirotaka Kita, Yusuke Takahata, Akiko Ota
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Patent number: 7968615Abstract: The present invention provides a polymerizable composition that imparts excellent adhesive properties with respect to tooth structure (particularly dentin) when applied as a dental material, and provides a polymerizable monomer that is used as a component of the polymerizable composition. The present invention is a compound (A) that is a compound represented by the following formula (1): where G indicates a polymerizable group, m indicates an integer of 2 or more, n indicates an integer of 1 or more, and the sequence order of m units having a polymerizable group and n units having a hydroxyl group is arbitrary. The present invention also is a polymerizable composition containing the compound (A).Type: GrantFiled: March 6, 2008Date of Patent: June 28, 2011Assignee: Kuraray Medical Inc.Inventor: Takahiro Sekiguchi
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Patent number: 7951851Abstract: A curable composition for dental use, containing a polymerizable monomer, inorganic particles (A) having irregular shapes and an average particle size of from 1.0 to 5.0 ?m, wherein the inorganic particles (A) are surface-treated with a silane coupling agent (a) represented by the formula (I): wherein R1 is a hydrogen atom or a methyl group, R2 is a hydrolyzable group, R3 is a hydrocarbon group having 1 to 6 carbon atoms, X is an oxygen or sulfur atom, p is 2 or 3, and q is an integer of from 8 to 13, and inorganic particles (B) having irregular shapes and/or spherical or nearly spherical shapes, and an average particle size of from 0.01 to 0.Type: GrantFiled: January 24, 2008Date of Patent: May 31, 2011Assignee: Kuraray Medical Inc.Inventors: Yoshiko Kuboe, Takahiro Sekiguchi
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Publication number: 20110124763Abstract: The present invention provides a polymerizable composition that exhibits high photocurability not only in the case of using a halogen lamp-curing unit but also in the case of using an LED light-curing unit, hardly has discoloration even when stored for a long time, and when applied to a dental material, a cured product of which has high bond strength to a tooth structure. The present invention is a polymerizable composition including: a photopolymerization initiator composition containing a photopolymerization initiator component consisting of only a bisacylphosphine oxide (A) and ?-diketone (B), and tertiary amine (C); and a polymerizable monomer (D). A weight ratio (A):(B) between the bisacylphosphine oxide (A) and the ?-diketone (B) is 1:9 to 9:1, and a weight ratio (D):(C) between the polymerizable monomer (D) and the tertiary amine (C) is 100:0.5 to 100:10.Type: ApplicationFiled: July 17, 2009Publication date: May 26, 2011Applicant: Kuraray Medical Inc.Inventors: Ai Hinamoto, Hiroshige Ishino
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Publication number: 20110065828Abstract: A dental composition of the present invention includes: a polymerizable monomer (A); an amorphous filler (B) having an average particle size of 1 to 20 ?m and including silica-based fine particles and coatings of an oxide that cover the surfaces of the silica-based fine particles; and inorganic particles (C) having an average particle size of 0.1 to 1.0 ?m. The oxide contains a zirconium atom, a silicon atom, and an oxygen atom. It is preferable that the dental composition contain 50 to 400 parts by weight of the filler (B) and 100 to 400 parts by weight of the inorganic particles (C) per 100 parts by weight of the polymerizable monomer (A).Type: ApplicationFiled: April 28, 2009Publication date: March 17, 2011Applicants: Kuraray Medical Inc., JGC Catalysts and Chemicals LTD.Inventors: Masaki Okubayashi, Koichi Okada, Yusuke Takahata, Keisuke Ohtsuka
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Publication number: 20110046260Abstract: The present invention provides a dental composition exhibiting both an excellent light diffusion property and excellent transparency, and having high mechanical strength and surface smoothness and gloss after polishing as a cured product and good handling properties as a paste. The present invention is a dental composition including: a polymerizable monomer (A); and an amorphous powder (B). The amorphous powder (B) has an average particle size of 1 to 20 ?m, and includes silica-based fine particles and coatings of an oxide that cover the surfaces of the silica-based fine particles. The oxide contains a zirconium atom, a silicon atom, and an oxygen atom. The difference in refractive index between the cured product of the polymerizable monomer (A) and the amorphous powder (B) is 0.005 to 0.03.Type: ApplicationFiled: April 28, 2009Publication date: February 24, 2011Applicants: Kuraray Medical Inc., JGC Catalysts and Chemicals LtdInventors: Masaki Okubayashi, Koichi Okada, Yusuke Takahata, Keisuke Ohtsuka
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Publication number: 20110046261Abstract: A dental composition of the present invention includes: a polymerizable monomer component (A); and an amorphous filler (B) having an average particle size of 1 to 20 ?m and including silica-based fine particles and coatings of an oxide that cover the surfaces of the silica-based fine particles. The oxide contains a zirconium atom, a silicon atom, and an oxygen atom. The dental composition contains 20 to 500 parts by weight of the filler (B) per 100 parts by weight of the polymerizable monomer component (A). The dental composition has a viscosity of 10 to 800 Pa·s. It is preferable that the filler (B) contain spherical particles, and that the percentage of the spherical particles in the filler (B) be at least 60%.Type: ApplicationFiled: April 28, 2009Publication date: February 24, 2011Applicants: Kuraray Medical Inc., JGC Catalysts and Chemicals LTD.Inventors: Yoshiko Kuboe, Masaki Okubayashi, Koichi Okada, Keisuke Ohtsuka
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Publication number: 20110003267Abstract: A composition for dental use containing a polymerizable monomer (a) having an aromatic ring and a hydroxyl group, a polymerizable monomer (b) having an aromatic ring without having any hydroxyl groups, and a polymerizable monomer (c) other than the polymerizable monomers (a) and (b), wherein the composition for dental use contains the polymerizable monomers (a), (b), and (c) in an amount of from 10 to 30% by weight, from 50 to 70% by weight, and from 10 to 30% by weight, respectively, of all the polymerizable monomers. The composition for dental use of the present invention can be suitably used as a product capable of substituting a part or all of a natural tooth in the field of dental therapy.Type: ApplicationFiled: February 5, 2008Publication date: January 6, 2011Applicant: KURARAY MEDICAL INC.Inventors: Eiichi Terakawa, Akiko Ota, Takahiro Sekiguchi
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Publication number: 20100330005Abstract: A dental composition for oral use, containing a phosphorylated saccharide (a), a polyphosphoric acid and/or a salt thereof (b), and a cationic bactericidal agent (c), wherein a ratio of a total amount of the phosphorylated saccharide (a) and the polyphosphoric acid and/or a salt thereof (b) contained to an amount of the cationic bactericidal agent (c) contained, i.e. {(a)+(b)}/(c), is from 0.05 to 20 in a weight ratio.Type: ApplicationFiled: January 15, 2009Publication date: December 30, 2010Applicants: KURARAY MEDICAL INC., NATIONAL UNIVERSITY CORPORATION OKAYAMA UNIVERSITYInventors: Yasuhiro Yoshida, Naoko Namba, Noriyuki Nagaoka, Shogo Takashiba, Kazuomi Suzuki, Yamato Nojiri, Hiroshige Ishino, Takahiro Sekiguchi, Koichi Okada
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Publication number: 20100323022Abstract: A calcium phosphate composition comprising calcium phosphate particles (A) and a sulfonic acid salt (B), wherein the calcium phosphate composition contains 0.5 to 20 parts by weight of the sulfonic acid salt (B) based on 100 parts by weight of the calcium phosphate particles (A). This provides a calcium phosphate composition that has a time between the addition of a liquid agent to the calcium phosphate composition and the completion of setting in the use at a clinical site and the like, i.e., a setting time which is within an appropriate range and that is high in mechanical strength and good in marginal sealing ability.Type: ApplicationFiled: February 5, 2009Publication date: December 23, 2010Applicant: Kuraray Medical Inc.Inventors: Tadashi Hashimoto, Koichi Okada
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Patent number: 7820733Abstract: The invention provides a divided type dental polymeric core build-up material including a first paste (A) and a second paste (B), in which each of the pastes is a paste obtained by mixing at least a (meth)acrylate monomer, a filler having a particle size distribution within a range of 0.1 through 40 ?m and an average particle diameter of 0.7 through 10 ?m, and a fine particle filler having an average particle diameter of primary particles of 0.001 through 0.050 ?m, and having a viscosity at 25° C. of 280 through 470 P, and in which one of the pastes includes an oxidant and the other includes a reductant and at least one of the pastes includes a photopolymerization catalyst. The divided type dental polymeric core build-up material of this invention has high operability in core build-up and forms a polymerically cured substance with a good mechanical property.Type: GrantFiled: September 1, 2005Date of Patent: October 26, 2010Assignee: Kuraray Medical Inc.Inventor: Yasujiro Ohara
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Publication number: 20100267856Abstract: A cement for dental use, containing a first agent and a second agent, wherein both of the first agent and the second agent contain a polymerizable monomer (a) and a filler (b), wherein the first agent and/or the second agent further contains a photopolymerization initiator (c), wherein further as a chemical polymerization initiator (d), either one of the first agent and the second agent contains an oxidizing agent (f) and the other contains a reducing agent (g), the oxidizing agent (f) and the reducing agent (g) constituting a redox polymerization initiator, wherein the photopolymerization initiator (c) contains an ?-diketone, and the photopolymerization initiator (c) is contained in a total amount of from 0.010 to 0.100 parts by weight, based on 100 parts by weight of the total amount of the polymerizable monomer (a), wherein the chemical polymerization initiator (d) is contained in a total amount of from 0.Type: ApplicationFiled: December 25, 2008Publication date: October 21, 2010Applicant: Kuraray Medical Inc.Inventors: Hiroki Shinoda, Mitsuru Takei, Hidemi Nakayama
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Patent number: 7815434Abstract: The invention provides a dental coating kit with high adhesiveness to teeth that contains a primer composition including an acidic group-containing polymeric monomer (a), water (b) and a water-soluble solvent (c) and a surface smoothing composition including a polyfunctional polymeric monomer (f), a volatile solvent (g) and a photopolymerization initiator (h); and a dental coating kit with high adhesiveness to teeth and minimally suffering from chipping and peeling off that contains a primer composition including an acidic group-containing polymeric monomer (a), water (b) and a water-soluble solvent (c), a coating composition including a polymeric monomer (d) and a photopolymerization initiator (e), and a surface smoothing composition including a polyfunctional polymeric monomer (f), a volatile solvent (g) and a photopolymerization initiator (h). Either dental coating kit is particularly useful as a kit for preventing stain and color return of a bleached tooth.Type: GrantFiled: October 6, 2003Date of Patent: October 19, 2010Assignee: Kuraray Medical Inc.Inventors: Mitsuru Takei, Junichi Ohtsuki