Patents Assigned to GC Corporation
  • CEMENT FOR SEALER
    Publication number: 20100068678
    Abstract: To provide a dental glass ionomer cement for a sealer to be used for sealing a gap between a gutta-percha point filled in a root canal in a dental root canal treatment and a root canal wall, with a prolonged setting time and with sufficient setting property even in a root canal having much water content, the dental cement for a sealer includes a polymer of ?-? unsaturated carboxylic acid, oxide powder capable of reacting with the polymer of ?-? unsaturated carboxylic acid, and water, and further includes an organic acid salt of metal selected from Mg, Ca, and Sr and/or a hydroxide of metal selected from Mg, Ca, and Sr.
    Type: Application
    Filed: September 2, 2009
    Publication date: March 18, 2010
    Applicant: GC Corporation
    Inventors: Koji Tanaka, Hideki Yarimizu, Hisashi Nakaseko
  • Dental restorative material composition
    Patent number: 7678843
    Abstract: To provide a dental restorative material composition using an organic-inorganic composite filler having excellent surface smoothness like a natural tooth, low polymerization shrinkage, excellent X-ray contrast imaging property, similar transparency to that of a natural tooth, and no variation of transparency before and after the composition is hardened, the dental restorative material composition includes (a) a (meth)acrylate monomer, (b) an organic-inorganic composite filler having an average particle diameter of 5 to 50 ?m which is made by mixing a (meth)acrylate monomer and a fine particle filler having an average primary particle diameter of 0.005 to 0.3 ?m and having X-ray impermeability, (c) a fine particle filler having an average primary particle diameter of 0.005 to 0.04 ?m, and (d) a photopolymerization initiator.
    Type: Grant
    Filed: September 20, 2007
    Date of Patent: March 16, 2010
    Assignee: GC Corporation
    Inventors: Futoshi Fusejima, Naoko Jimbo, Shinji Kaga
  • PASTE-TYPE DENTAL CEMENT
    Publication number: 20100063176
    Abstract: To provide a paste-type dental cement capable of being used properly for temporary adhering or temporary filling, a paste-type dental cement, which comprises a phosphoric acid and/or a polymer of ?-? unsaturated carboxylic acid, an oxide powder capable of reacting with the phosphoric acid and/or the polymer of ?-? unsaturated carboxylic acid, and a water, further includes a liquid not reacting with the oxide powder.
    Type: Application
    Filed: September 3, 2009
    Publication date: March 11, 2010
    Applicant: GC Corporation
    Inventors: Katsuhito KATO, Hideki Yarimizu
  • MIXING TIP
    Publication number: 20100012210
    Abstract: To prevent photo-activation of a photopolymerization catalyst in pastes of an adhesive for a dental bracket in a mixing tip and to enable a dentist to visually confirm the pastes, a mixing tip includes a housing (2) having a mixing element (1), a paste guiding member (3) fixed to the housing (2), and a locking member fixed or integrally formed on the paste guiding member (3) or the housing (2), the guiding member includes paste inlets (3a) and flow path parts (3b), the locking member has a pawl part locked with a locking hole of the syringe holder and a projection part inserted to a hole part of the syringe holder, or has two pawl parts locked with two locking holes, and the housing (2) and the paste guiding member (3) are made of a colored plastic material only transmitting light except light having the photo-activating wavelength.
    Type: Application
    Filed: June 30, 2009
    Publication date: January 21, 2010
    Applicant: GC Corporation
    Inventors: Tatsunosuke MIYANO, Masayuki TAKAHASHI, Kazuma NOGUCHI
  • FIXTURE MOUNT FIXING TOOL
    Publication number: 20090325124
    Abstract: To provide a fixture mount fixing tool for preventing damage of a fixture in the storage container, when a fixture mount and the fixture are engaged, the fixture mount fixing tool includes a top part (2) having a bolt insertion through-hole (1) and a droop part (3) drooped therefrom, the bolt insertion through-hole (1) includes an engagement hole (4) engaged with a regular polygonal-shaped part (Zb) formed on an end part outer face of the fixture mount (Z), and/or the droop part (3) includes engagement faces contacted with plane parts on an outer face of the fixture mount (Z),and the droop part (3) includes a locking part (3b) locked with a container holding hole of a base table for holding the storage container (Y) or a locking part (3b) locked with engagement part formed on the side face of the container (Y).
    Type: Application
    Filed: June 30, 2009
    Publication date: December 31, 2009
    Applicant: GC Corporation
    Inventors: Naoto Fujii, Masashi Takahashi
  • BONE GRAFT SUBSTITUTE
    Publication number: 20090299475
    Abstract: To provide a bone graft substitute having an appropriate absorption period in a living body and high osteoconductivity, the bone graft substitute contains a carbonate apatite and an osteoinductive factor, the osteoinductive factor is preferably at least one kind selected from a group including BMP (a bone morphogenetic protein), GDF (a growth differentiation factor), TGF-? (a transformation growth factor), FGF (a fibroblast growth factor), IGF (an insulin-like growth factor), PDGF (a platelet-derived growth factor), BDNF (a brain-derived nerve growth factor), and NGF (a nerve growth factor), and the bone graft substitute has open pores, preferably having a diameter of 50 to 1000 ?m and/or a diameter of 0.001 to 5 ?m, with porosity of 20 to 80%.
    Type: Application
    Filed: June 1, 2009
    Publication date: December 3, 2009
    Applicant: GC Corporation
    Inventors: Katsushi YAMAMOTO, Katsuyuki YAMANAKA, Yuhiro SAKAI, Youko SUDA, Tadashi KANEKO
  • DETACHABLE STOPPER FOR DENTAL DRILL
    Publication number: 20090291411
    Abstract: To provide a detachable stopper fixed on a spindle part of a dental drill to regulate the depth of an implant fixture embedding hole in an implant treatment, the detachable stopper includes a stopper main body 1 being made of an elastically deformable metal material, having a cylindrical shape, having a slightly smaller inner diameter than an outer diameter of the spindle part, having a slit part 1a formed along an axial overall length from an outer peripheral face to an inner peripheral face to have an opening, and having a diameter expanding tool insertion part 1b bored at an axial center of the slit part 1a, and a diameter expanding tool 2 to be inserted into the diameter expanding tool insertion part 1b to expand the inner diameter of the stopper main body 1 to be larger than the outer diameter of the spindle part.
    Type: Application
    Filed: May 5, 2009
    Publication date: November 26, 2009
    Applicant: GC Corporation
    Inventors: Naoto Fujii, Yoshihiro Sakaguchi
  • BLOCK-SHAPED SCAFFOLD FOR TISSUE ENGINEERING AND PRODUCTION METHOD THEREOF
    Publication number: 20090261492
    Abstract: A block-shaped scaffold for a tissue engineering with improved shape stability and less volume change in water is produce by the steps of approximate-uniformly mixing the particle-shaped material having 100 to 2000 ?m diameter with a solution, where a biodegradable polymer is dissolved with an organic solvent, freezing, drying it to remove the solvent, pulverizing thus obtained intermediate product, dissolving it with a liquid, where the biodegradable polymer is not dissolved, to remove the particle-shaped material taking thus obtained intermediate product into a mold, and pressing and heating it, the scaffold having ununiform and continuous holes occupying 20 to 80% in a cross-section area in a three-dimensional network structure having a small hole structure with 5 to 50 ?m diameter, elastic coefficient being 0.1 to 2.5 MPa, and volume change being 95 to 105% when dipping it in water for 24 hours.
    Type: Application
    Filed: June 22, 2009
    Publication date: October 22, 2009
    Applicant: GC Corporation
    Inventors: Katsushi Yamamoto, Katsuyuki Yamanaka, Youko Suda, Tadashi Kaneko
  • DENTAL SILICONE-BASED FITTING CHECK MATERIAL COMPOSITION
    Publication number: 20090247663
    Abstract: To provide a dental silicone-based fitting check material composition capable of confirming a precise difference of film thicknesses and having a wide confirmation range of the film thicknesses, the dental silicone-based fitting check material includes 100 weight parts of organopolysiloxane having at least two aliphatic unsaturated hydrocarbons in one molecule, 0.1 to 30 weight parts of organohydrogenpolysiloxane having at least three hydrogen atoms directly bonding to silicon atoms in one molecule, 10 ppm to 1 weight parts of a silicone-soluble platinum compound with respect to the total weight of the above two components, 0.05 to 20 weight parts of powdery palladium, 10 to weight parts of an inorganic filler, and 0.01 to 10 weight parts of a pigment selected from phthalocyanine blue, cobalt blue, and ultramarine.
    Type: Application
    Filed: March 31, 2009
    Publication date: October 1, 2009
    Applicant: GC Corporation
    Inventors: Hiroshi KAMOHARA, Yutaka SHINOZAKI
  • SCAFFOLD FOR TISSUE ENGINEERING AND PRODUCTION METHOD THEREOF
    Publication number: 20090246873
    Abstract: To provide a scaffold for tissue engineering which consists of a bioabsorbable polymer material to be absorbed in a biotissue, and holds strength of the whole scaffold while having a porosity proper for culturing cells inside thereof as well, a method for producing the scaffold for tissue engineering includes steps of dissolving a bioabsorbable polymer material with an organic solvent, drying the solution so as to produce a porous bioabsorbable polymer material having a porosity of 50 to 99%, covering the porous bioabsorbable polymer material with a bioabsorbable polymer material having a thickness of 0.01 to 5 mm, pores of 10 to 3000 ?m diameter, a fracture strength of 0.05 to 0.15 MPa, and a volume of 15 to 90% with respect to the whole scaffold.
    Type: Application
    Filed: March 31, 2009
    Publication date: October 1, 2009
    Applicant: GC Corporation
    Inventors: Katsushi YAMAMOTO, Katsuyuki Yamanaka, Youko Suda, Yuhiro Sakai, Tadashi Kaneko
  • BONE TISSUE REGENERATION SHEET AND PRODUCTION METHOD THEREOF
    Publication number: 20090228027
    Abstract: To provide a bone tissue regeneration sheet having a cortical bone tissue layer of 200 ?m or more in thickness, the bone tissue regeneration sheet is produced by seeding chondroblast or stem cells for differentiating to chondrocyte on one side of a porous bioabsorbable polymer sheet, taking the seeded porous body into a culture medium, applying centrifugal force of 100 to 1000 G to the culture medium for a predetermined time so as to aggregate the chondroblast or the stem cells for differentiating to chondrocyte, culturing the aggregated cells in a culture medium not containing serum but containing one or two or more kinds selected from ascorbic acid, an ascorbic acid derivative, and dexamethasone without applying centrifugal force to form a chondrocyte layer having a thickness of 200 ?m or more.
    Type: Application
    Filed: March 10, 2009
    Publication date: September 10, 2009
    Applicant: GC Corporation
    Inventors: Katsuyuki YAMANAKA, Katsushi YAMAMOTO, Youko SUDA, Yuhiro SAKAI, Tadashi KANEKO
  • METHOD OF FABRICATING SHEET FOR CARTILAGE TISSUE REGENERATION
    Publication number: 20090221076
    Abstract: An objective of the present invention is to provide a production method of a sheet for regenerating a cartilage tissue, which uses a conventional sheet-shaped porous body comprising a biological absorbency synthetic high polymer, such as polylactic acid, polyglycolic acid and a copolymer of lactic acid and glycolic acid. The sheet for regenerating the cartilage tissue can differentiate chondrocytes or stem cells without culturing the cells by pressurizing such as a pressurizing culture like the conventional method, and can accumulate the cells in a supporting carrier with high efficiency.
    Type: Application
    Filed: February 28, 2006
    Publication date: September 3, 2009
    Applicants: GC Corporation, TWO CELLS Co. Ltd.
    Inventors: Yukio Kato, Koichiro Tsuji, Katsuyuki Yamanaka
  • POROUS CELL SCAFFOLD AND PRODUCTION METHOD THEREOF
    Publication number: 20090186412
    Abstract: For easily seeding cells in its scaffold, a porous cell scaffold is produced by steps of filling a guiding solution with kinematic viscosity being 50 to 450% of that of a culture medium, in a whole continuous small hole structure having hole diameters of 5 to 3200 ?m and an average hole diameter of 50 to 1500 ?m, of a sheet-shaped or block-shaped scaffold having a thickness of 2 mm or more, supplying thereafter a culture medium with cells being suspended to an upper side of the scaffold, sucking the guiding solution from a lower side of the scaffold by low suction force, and entering thereby the culture medium with cells being suspended into the whole small hole structure, where a water absorber such as a filter paper is preferably used for sucking the guiding solution by low suction force.
    Type: Application
    Filed: January 21, 2009
    Publication date: July 23, 2009
    Applicant: GC Corporation
    Inventors: Katsuyuki Yamanaka, Youko Suda, Katsushi Yamamoto, Yuhiro Sakai, Tadashi Kaneko
  • Impression coping
    Patent number: D604413
    Type: Grant
    Filed: September 25, 2008
    Date of Patent: November 17, 2009
    Assignee: GC Corporation
    Inventors: Ryosuke Ikeya, Shinichiro Hanada, Masashi Takahashi
  • Dental implant fixture
    Patent number: D604851
    Type: Grant
    Filed: August 22, 2008
    Date of Patent: November 24, 2009
    Assignee: GC Corporation
    Inventor: Yusuke Ishikawa
  • Temporary abutment
    Patent number: D604852
    Type: Grant
    Filed: September 26, 2008
    Date of Patent: November 24, 2009
    Assignee: GC Corporation
    Inventors: Nassib Fares, Joseph F. Saade, Ryosuke Ikeya, Shinichiro Hanada, Masashi Takahashi
  • Dental implant fixture
    Patent number: D605291
    Type: Grant
    Filed: August 22, 2008
    Date of Patent: December 1, 2009
    Assignee: GC Corporation
    Inventor: Yusuke Ishikawa
  • Dental implant fixture mount
    Patent number: D606196
    Type: Grant
    Filed: October 21, 2008
    Date of Patent: December 15, 2009
    Assignee: GC Corporation
    Inventors: Nassib Fares, Joseph F. Saade, Ryosuke Ikeya, Shinichiro Hanada, Masashi Takahashi
  • Dental abutment
    Patent number: D611603
    Type: Grant
    Filed: April 14, 2008
    Date of Patent: March 9, 2010
    Assignee: GC Corporation
    Inventor: Yusuke Noguchi
  • Dental abutment
    Patent number: D611604
    Type: Grant
    Filed: July 31, 2008
    Date of Patent: March 9, 2010
    Assignee: GC Corporation
    Inventor: Shuji Aoyagi