Patents Assigned to Shofu Dental Corporation
  • Method and instrument for condensing restorative dental materials
    Patent number: 4586901
    Abstract: A dental condensing instrument having an elastomeric tip of sufficient size to surround the margins of a prepared cavity, which will yieldably urge the flow of soft restorative materials inside prepared cavities to improve their adaptation to cavity walls and margins without the introduction of deleterious air voids therein. When hand pressure is applied, the tip will not only seal said margins, but also apply a steady, isostatic condensing force upon said materials.
    Type: Grant
    Filed: October 10, 1984
    Date of Patent: May 6, 1986
    Assignee: Shofu Dental Corporation
    Inventors: John S. Tanaka, William M. Belef
  • Dental cement composition
    Patent number: 3962267
    Abstract: The dental cement composition comprises an aqueous resin composition prepared by the copolymerization of 3-butene-1,2,3-tricarboxylic acid and an .alpha.,.beta.-olefinic unsaturated monocarboxylic acid and, when desired, an additional polymerizable monomer as well as a metal oxide. The dental cement composition possesses compressive strength.
    Type: Grant
    Filed: July 11, 1974
    Date of Patent: June 8, 1976
    Assignees: Shofu Dental Corporation, Teikoku Chemical Industry Co., Ltd.
    Inventors: Narishige Suzuki, Yoshihiro Morino, Yoshitaka Hashiguchi, Tunehiro Segawa