Patents Assigned to G-C Dental Industrial Corporation
-
Patent number: 5043361Abstract: A combined chemical-/light-polymerization type composition for dental restoration consists of a formulation A composed main of a. an ethylenically polymerizable unsaturated compound, b. a photo-polymerization initiator and c. a reducing agent, and a formulation B composed mainly of d. a filler and e. an organic peroxide. The formulations A and B are separately packaged and designed to be mixed for use.Type: GrantFiled: June 7, 1990Date of Patent: August 27, 1991Assignee: G-C Dental Industrial CorporationInventors: Takao Kubota, Tetsuro Sakuma, Ryoji Nakazato
-
Patent number: 5026283Abstract: A capsule for a tooth-restoring material includes a cylinder containing therein the predetermined amount of a powder component of the tooth-restoring material and fitted at its rear end with an extruding plunger; a breakable package held in front of an extreme end opening in the cylinder, the package containing therein an amount of a liquid component of the tooth-restoring material and having its cylinder-facing side formed of a weak material; and a member for holding the package having a nozzle at its outermost end; wherein at a position of the plunger corresponding to the extreme end opening in the cylinder is provided a member capable of breaking through the package of a size small enough not to close up the opening and the nozzle, when the plunger moves to and reaches the package-holding member.Type: GrantFiled: June 1, 1989Date of Patent: June 25, 1991Assignee: G-C Dental Industrial CorporationInventors: Satoshi Osanai, Manabu Hiraoka
-
Patent number: 4959220Abstract: An antiseptic-containing alginate impression material contains 0.01 to 7 parts by weight of an antiseptic such as glutaraldehyde and chlorohexydine gluconate per 100 parts by weight of a cured product of an alginate impression material. The antiseptic may be encapsulated in a microcapsule or clathrated in a cyclodextrin.Type: GrantFiled: October 12, 1988Date of Patent: September 25, 1990Assignee: G-C Dental Industrial CorporationInventors: Tameyuki Yamamoto, Masao Abiru
-
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
-
Patent number: 4843110Abstract: A light curing composition for dental restoration comprises (a) a polymerizable compound containing at least one ethylenically unsaturated double-bond, (b) at least one photo-polymerization initiator selected from ketal base compounds defined hereinafter, (c) at least one photopolymerization initiator selected from thioxanthone base compounds defined hereinafter, (d) a reducing agent and (e) a filler.Type: GrantFiled: September 11, 1986Date of Patent: June 27, 1989Assignee: G-C Dental Industrial CorporationInventors: Takao Kubota, Tetsuro Sakuma, Ryoji Nakazato
-
Patent number: 4804690Abstract: A light curing composition for dental restoration comprises (a) a polymerizable compound containing at least one ethylenically unsaturated double-bond, (b) at least one photo-polymerization initiator selected from ketal base compound as defined herein, (c) at least one photo-polymerization initiator selected from anthraquinone base compounds as defined herein, (d) a reducing agent and (e) a filler.Type: GrantFiled: September 11, 1986Date of Patent: February 14, 1989Assignee: G-C Dental Industrial CorporationInventors: Takao Kubota, Tetsuro Sakuma, Ryoji Nakazato
-
Patent number: 4713403Abstract: A dental composite resin composition is disclosed, which comprises as main components a polymerizable monomer, an inorganic and/or organic filler, a gold powder and/or a gold-color alloy powder, and a polymerization catalyst. The dental composite resin composition of the present invention is useful as a filling material for repairing a tooth cavity, which has a gold-color luster and exhibits an excellent abrasion resistance as well as an excellent x-ray contrast.Type: GrantFiled: March 24, 1986Date of Patent: December 15, 1987Assignee: G-C Dental Industrial CorporationInventors: Bunsaku Yoshida, Kentaro Tomioka
-
Patent number: 4647311Abstract: A gypsum composition for denture investment comprises 100 parts by weight of a mixture of 50-90 parts by weight of .alpha.-Gypsum hemihydrate (.alpha.-CaSO.sub.4.1/2H.sub.2 O) with 10-50 parts by weight of .beta.-Gypsum hemihydrate (.beta.-CaSO.sub.4.1/2H.sub.2 O) and 0.2-2.0 parts by weight of a soluble potassium salt and 0.5-3.0 parts by weight of mannitol. As the soluble potassium salt, use may be made of one or more of potassium sulfate, potassium chloride and potassium tartrate. The gypsum composition may further include 0.5-5.0 parts by weight of dihydrate gypsum.Type: GrantFiled: August 30, 1985Date of Patent: March 3, 1987Assignee: G-C Dental Industrial CorporationInventors: Nobukazu Ohi, Koji Ohno, Satoshi Tosaki
-
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
-
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
-
Patent number: 4235633Abstract: A novel dental composition is provided, which comprises; a combination of 8 to 92% by weight of liquid acid phosphates obtained by replacing one or two hydrogen atoms of orthophosphoric acid with alcohols having 3 to 13 carbon atoms and being essentially insoluble in water, and 92 to 8% by weight of at least one of reactive multivalent metallic salts selected from the group consisting of oxides, hydroxides, basic salts and silicates of alkaline earth metals, aluminium or heavy metals, said compounds being permitted to react with each other such that they are cured at room temperature. This composition may further contain liquid organic carboxylic acid having 6 or more carbon atoms, solid organic carboxylic acid having 5 or less carbon atoms and fluorine compounds in the form of fluorides silico fluorides titanium fluorides, and zirconium fluorides.Type: GrantFiled: January 16, 1979Date of Patent: November 25, 1980Assignee: G-C Dental Industrial CorporationInventors: Kentaro Tomioka, Shunichi Futami
-
Patent number: D310582Type: GrantFiled: September 7, 1988Date of Patent: September 11, 1990Assignee: G-C Dental Industrial CorporationInventor: Osamu Kujirai