Patents by Inventor Shoji Akahane
Shoji Akahane has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 7326055Abstract: The invention relates to a method for bleaching teeth in which a solution of a nitrogen-doped titanium oxide powder is contacted on a surface of the teeth and the surface of the teeth is irradiated to bleach the surface of the teeth-by activating a photocatalytic reaction.Type: GrantFiled: May 17, 2006Date of Patent: February 5, 2008Assignee: GC CorporationInventors: Shin Yamaguchi, Toshihiro Sekiguchi, Keisuke Ikushima, Shoji Akahane, Koyu Aoki, Takeshi Morikawa, Takeshi Ohwaki, Yasunori Taga
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Patent number: 7250155Abstract: To eliminate a defect in conventional dental bleaching agent, that light for activating titanium oxide hardly reaches down to the titanium oxide at the teeth surface to be bleached, a dental bleaching agent set consists of two components of which the first component is attached to teeth surface and irradiation of light is followed after the second component is contacted on the teeth surface, the first component consisting of an organic solvent, containing at least one of a titanium oxide, a nitrogen doped titanium oxide, and a titanium oxinitride having photocatalytic activities, and preferably one or more of a metal oxide, a metal salt, and a metal powder, a thickener and water, the second component consisting of a compound that produces hydrogen peroxide in water, a thickener and a carrier.Type: GrantFiled: March 4, 2004Date of Patent: July 31, 2007Assignees: GC Corporation, Kaisha Toyota Chuo KenkyushoInventors: Shin Yamaguchi, Toshihiro Sekiguchi, Keisuke Ikushima, Shoji Akahane, Koyu Aoki, Takeshi Morikawa, Takeshi Ohwaki, Yasunori Taga
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Publication number: 20060222604Abstract: A method for bleaching teeth comprises steps of applying a solution containing nitrogen-deeped titanium oxide powder on a surface of teeth, and irradiating the applied part with light to bleach the teeth based on a photocatalytic action thus produced, and a bleaching agent for teeth suitable for carrying out the method comprises a solution containing nitrogen deeped titanium oxide powder, in which the nitrogen-deeped titanium oxide is preferably a photocatalytic substance having a Ti—O—N structure having a titanium oxide crystalline lattice containing nitrogen and exhibiting a photocatalytic action in a visible light region, the bleaching agent contains preferably 0.01 to 5% by weight of the nitrogen-deeped titanium oxide powder, the nitrogen-deeped titanium oxide powder has a specific surface area of from 10 to 500 m2/g, the solution contains water and/or an alcohol as a solvent, and the bleaching agent further contains preferably 0.Type: ApplicationFiled: May 17, 2006Publication date: October 5, 2006Applicant: GC CorporationInventors: Shin Yamaguchi, Toshihiro Sekiguchi, Keisuke Ikushima, Shoji Akahane, Koyu Aoki, Takeshi Morikawa, Takeshi Ohwaki, Yasunori Taga
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Publication number: 20040180008Abstract: To eliminate a defect in conventional dental bleaching agent, that light for activating titanium oxide hardly reaches down to the titanium oxide at the teeth surface to be bleached, a dental bleaching agent set consists of two components of which the first component is attached to teeth surface and irradiation of light is followed after the second component is contacted on the teeth surface, the first component consisting of an organic solvent, containing at least one of a titanium oxide, a nitrogen doped titanium oxide, and a titanium oxinitride having photocatalytic activities, and preferably one or more of a metal oxide, a metal salt, and a metal powder, a thickener and water, the second component consisting of a compound that produces hydrogen peroxide in water, a thickener and a carrier.Type: ApplicationFiled: March 4, 2004Publication date: September 16, 2004Applicants: GC CORPORATION, KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHOInventors: Shin Yamaguchi, Toshihiro Sekiguchi, Keisuke Ikushima, Shoji Akahane, Koyu Aoki, Takeshi Morikawa, Takeshi Ohwaki, Yasunori Taga
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Publication number: 20040047816Abstract: A method for bleaching teeth comprises steps of applying a solution containing nitrogen-deeped titanium oxide powder on a surface of teeth, and irradiating the applied part with light to bleach the teeth based on a photocatalytic action thus produced, and a bleaching agent for teeth suitable for carrying out the method comprises a solution containing nitrogen-deeped titanium oxide powder, in which the nitrogen-deeped titanium oxide is preferably a photocatalytic substance having a Ti—O—N structure having a titanium oxide crystalline lattice containing nitrogen and exhibiting a photocatalytic action in a visible light region, the bleaching agent contains preferably 0.01 to 5% by weight of the nitrogen-deeped titanium oxide powder, the nitrogen-deeped titanium oxide powder has a specific surface area of from 10 to 500 m2/g, the solution contains water and/or an alcohol as a solvent, and the bleaching agent further contains preferably 0.Type: ApplicationFiled: August 21, 2003Publication date: March 11, 2004Applicant: GC CorporationInventors: Shin Yamaguchi, Toshihiro Sekiguchi, Keisuke Ikushima, Shoji Akahane, Koyu Aoki, Takeshi Morikawa, Takeshi Ohwaki, Yasunori Taga
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Patent number: 6291548Abstract: A dental cement composition is disclosed, comprising a liquid material and a powder material, wherein said liquid material comprises 4-methacryloxyethyl trimellitic acid and water, said powder material comprising a powdered fluoroalumino silicate glass or a powdered metal oxide containing zinc oxide as the major component, the dental cement composition of the invention has a superior adhesive strength and adhesive durability to the tooth structure and superior in mechanical strengths, particularly in bending strength, without using dental adhesives requiring the surface treatment or priming.Type: GrantFiled: July 28, 1999Date of Patent: September 18, 2001Assignee: GC CorporationInventors: Shoji Akahane, Hisashi Nakaseko
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Patent number: 6217644Abstract: A dental adhesive set is disclosed, comprising (I) a tooth surface conditioning agent and (II) a bonding material, wherein the tooth surface conditioning agent (I) is an acid aqueous solution, and the bonding material (II) comprises a mixture of: (a) a fluoroalumino silicate glass powder, (b) one or two or more unsaturated organic compounds selected from polymerizable unsaturated organic compounds having at least one CH2═CR1—COO—, wherein R1 is H or CH3, and not having an acid group; (c) an acid; (d) water; and (e) a photopolymerization catalyst. According to the dental adhesive set of the present invention, the dental restoration and the dentin can be firmly and surely adhered to each other in a clinically simple operation, and by imparting properties for continuously releasing a fluoride ion not only the dentinal restoration but also the reinforcement of tooth structure and the inhibition of secondary caries can be expected.Type: GrantFiled: August 24, 1999Date of Patent: April 17, 2001Assignee: GC CorporationInventors: Kaori Matsunae, Shoji Akahane
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Patent number: 6174935Abstract: A dental adhesive kit is disclosed, comprising a combination of: (i) a self-etching primer comprising (A) from 1.0 to 50% by weight of a methacrylate or acrylate having an acidic group and having at least one unsaturated double bond, (B) from 1.0 to 98% by weight of a water-soluble organic solvent, and (C) from 1.0 to 90% by weight of water; and (ii) a bonding agent comprising (D) from 10 to 90% by weight of a methacrylate or acrylate having neither acidic group nor hydroxyl group and having at least one unsaturated double bond, (E) from 10 to 90% by weight of a methacrylate or acrylate not having an acidic group but having a hydroxyl group and having at least one unsaturated double bond, (F) from 0.1 to 5.0% by weight of a photopolymerization initiator, (G) from 0.1 to 5.0% by weight of a photopolymerization accelerator, and (H) from 1.0 to 60% by weight of a filler.Type: GrantFiled: December 17, 1998Date of Patent: January 16, 2001Assignee: GC CorporationInventors: Kaori Matsunae, Shoji Akahane, Kazuo Hirota
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Patent number: 5962550Abstract: A dental filling resin composition is disclosed, comprising: a reaction product between an aluminosilicate glass powder containing at least one element selected from Ca, Sr, and Ra and an organic acid containing one or more carboxyl groups in one molecule thereof, a methanol-insoluble polymer, a monomer containing at least one unsaturated double bond and having no acidic group, and a polymerization initiator, and optionally a filler.The dental filling resin composition of the invention has not only superior mechanical characteristics and esthetics but also an ability to release a fluorine ion and therefore, can be suitably used for a wide variety of clinical applications such as filling restoration of tooth, core construction, or sealing of pit and fissure.Type: GrantFiled: March 5, 1998Date of Patent: October 5, 1999Assignee: GC CorporationInventors: Shoji Akahane, Hisashi Sato, Hideki Yarimizu, Kazuo Hirota
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Patent number: 5063257Abstract: A dental glass ionomer cement composition comprises:(a) 5 to 100 parts by weight of a polymer of an .alpha.-.beta. unsaturated carboxylic acid having a weight average molecular weight of 5,000 to 40,000,(b) 5 to 100 parts by weight of a fluoroaluminosilicate glass powder having an average particle size of 0.02 to 10 .mu.m and a specific gravity of 2.4 to 4.0 and capable of reacting with said "polymer of an .alpha.-.beta. unsaturated carboxylic acid having a weight average molecular weight of 5,000 to 40,000",(c) 5 to 100 parts by weight of a polymerizable unsaturated organic compound having at least one CH.sub.2 .dbd.C(R1)--COO--group wherein R1=H or CH.sub.3,(d) 0.01 to 5 parts by weight of a polymerization catalyst,(e) 2 to 50 parts by weight of water,(f) 0.01 to 20 parts by weight of a surface active agent, and(g) 0.01 to 5 parts by weight of a reducing agent, and optionally h. 0 to 50 parts by weight of an inorganic filler having an average particle size of 0.02 to 10 .mu.Type: GrantFiled: December 11, 1989Date of Patent: November 5, 1991Assignee: G-C Dental Industrial Corp.Inventors: Shoji Akahane, Satoshi Tosaki, Yukiharu Kusayanagi, Shigenobu Kusakai, Kazuo Hirota, Kentaro Tomioka
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Patent number: 4900697Abstract: A fluoroaluminosilicate glass powder for dental glass ionomer cements has a specific gravity of 2.4 to 3.5 and a mean particle size of 0.02 to 10 .mu.m, contains in its components 20 to 50% by weight of SiO.sub.2, 20 to 40% by weight of Al.sub.2 O.sub.3, 15 to 40% by weight of SrO, 1 to 20% by weight of F.sub.2 and 0 to 15% by weight of P.sub.2 O.sub.5 on the converted oxide basis, and is substantially free from alkali metal ions such as Li, Na, K, Rb and Cs ions, and Be, Mg (and Ca) and Ba ions of alkali earth metal ions. For further improvements in physical properties, 100 parts by weight of the glass powder are surface-treated with 0.01 to 5 parts by weight of an acid and/or a fluoride.Type: GrantFiled: January 29, 1988Date of Patent: February 13, 1990Assignee: G-C Dental Industrial CorporationInventors: Shoji Akahane, Satoshi Tosaki, Kazuo Hirota, Kentaro Tomioka
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Patent number: 4775592Abstract: A fluoroaluminosilicate glass powder for dental glass ionomer cement, a surface of which is treated with a fluoride in an amount of from 0.01 to 5 parts by weight based on 100 parts by weight of the glass powder, is disclosed. The fluoroaluminosilicate glass powder of the invention is improved in not only physical properties such as crushing strength but also mixing workability without impairing the inherent characteristics thereof for the dental use.Type: GrantFiled: August 21, 1986Date of Patent: October 4, 1988Assignee: G-C Dental Industrial Corp.Inventors: Shoji Akahane, Kazuo Hirota, Kentaro Tomioka
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Patent number: 4678436Abstract: A color-changeable cement composition for dental use is disclosed, which comprises a first component comprising a metal oxide as a major ingredient, and a second component which can react with the first component to form a set body, wherein the composition contains a substance which changes its color tone with the change in pH so that the color tone of the cement composition can change upon intital setting of the cement composition. The composition enables one to visually observe the degree of setting of the cement composition.Type: GrantFiled: April 29, 1986Date of Patent: July 7, 1987Assignee: G-C Dental Industrial Corp.Inventors: Kenji Kondo, Shigeru Katsuyama, Shoji Akahane, Kentaro Tomioka
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Patent number: 4652593Abstract: A dental cement composition consisting of a composition A and a composition B,said composition A comprising (a) 100 parts by weight of a powder containing 20 to 70% by weight of calcium oxide and 30 to less than 80% by weight of aluminum oxide, said powder being coated on the surface with a water-soluble high-molecular substance, and (b) 2 to 70 parts by weight of a calcium hydroxide powder, andsaid composition B comprising an aqueous solution containing 0.01 to 70% by weight of a water-soluble high-molecular substance.Type: GrantFiled: February 12, 1986Date of Patent: March 24, 1987Assignees: G-C Dental Industrial Corp., Haruyuki KawaharaInventors: Haruyuki Kawahara, Shoji Takeda, Hiroshi Oshima, Kentaro Tomioka, Shoji Akahane, Eiichi Yoshii, Kazuo Hirota
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Patent number: 4647600Abstract: A dental cement composition consisting of a composition A and a composition B,said composition A comprising at least two powders, (a) 100 parts by weight of a powder containing more than 20% by weight to 70% by weight of calcium oxide and 30% by weight to less than 80% by weight of aluminium oxide and treated on the surface with 0.01 to 5% by weight of at least one selected from the group consisting organic acids and/or inorganic acids, and (b) 2 to 70 parts by weight of a calcium hydroxide powder, andsaid composition B comprising of an aqueous solution containing 0.01 to 70% by weight of a water-soluble high-molecular substance.Type: GrantFiled: February 12, 1986Date of Patent: March 3, 1987Assignees: G-C Dental Industrial Corp., Haruyuki KawaharaInventors: Haruyuki Kawahara, Shoji Takeda, Hiroshi Oshima, Kentaro Tomioka, Shoji Akahane, Eiichi Yoshii, Kazuo Hirota
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Patent number: 4632824Abstract: A composition applied in the mouth which has a preventive effect on dental carries and contains such tannic acid derivatives as of solubility resistance to water.Type: GrantFiled: June 6, 1984Date of Patent: December 30, 1986Assignee: G-C Dental Industrial CorporationInventors: Kazuo Hirota, Shoji Akahane, Kentaro Tomioka
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Patent number: 4591384Abstract: A dental cement composition comprises a first ingredient containing as the main component a metal oxide and a second ingredient capable of reacting with the first ingredient to form a set mass, and further contains a tannic acid derivative that is sparingly soluble in water and a reducing agent that is soluble in water. The instant cement composition may contain an aluminum salt to improve the properties thereof.Type: GrantFiled: July 19, 1984Date of Patent: May 27, 1986Assignee: G-C Dental Industrial Corp.Inventors: Shoji Akahane, Kazuo Hirota, Kentaro Tomioka
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Patent number: 4524824Abstract: A dental cement comprising a cement powder to which are added one or more of tannic acid derivatives consisting of the group of a tannic acid-protein combination, a tannic acid-formaldehyde combination, acetyl tannate and a metal salt of tannic acid, said tannic acid derivatives being sparingly soluble in water.Type: GrantFiled: April 13, 1983Date of Patent: June 25, 1985Assignee: G-C Dental Industrial CorporationInventors: Hirokata Shimokobe, Sueo Saito, Kentaro Tomioka, Shoji Akahane, Kazuo Hirota
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Patent number: 4374936Abstract: A liquid for setting dental cements is provided, in which an aqueous solution of a copolymer of acrylic and maleic acids contains a tetrahydrofurantetracarboxylic acid alone or in combination with at least one of tartaric acid, a fluorocomplex salt and a specific organic carboxylic acid. The specific organic carboxylic acid is expressed by the general formula:C.sub.m H.sub.n (COOH).sub.x (OH).sub.Type: GrantFiled: May 14, 1981Date of Patent: February 22, 1983Assignee: G-C Dental Industrial Corp.Inventors: Kentaro Tomioka, Kazuo Hirota, Hiroaki Muramatsu, Shoji Akahane
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Patent number: 4342677Abstract: A liquid for setting dental cements comprising a aqueous solution of a copolymer of acryclic acid and maleic acid, tartaric acid and one or more fluorocomplex salt.Type: GrantFiled: May 14, 1981Date of Patent: August 3, 1982Assignee: G-C Dental Industrial Corp.Inventors: Hiroaki Muramatsu, Kentaro Tomioka, Kazuo Hirota, Shoji Akahane