Patents Assigned to Perdent, GmbH.
  • Dental prostheses
    Patent number: 4281991
    Abstract: Dental prosthetic devices, such as artificial teeth, crowns, bridges and replacements for parts of teeth are provided comprising hardened resin dental materials containing at least one polymer and a finely divided inorganic filler, said filler being present in an amount of about 10 to 90% based on the weight of the material and having a particle size within the range of 10 to 400 millimicrons, said materials having an extremely high compressive strength, clear opalescence and a very smooth homogeneous surface.
    Type: Grant
    Filed: July 20, 1978
    Date of Patent: August 4, 1981
    Assignee: Perdent, GmbH
    Inventors: Rudy Michl, Peter Wollwage
  • Material for dental purposes
    Patent number: 4267097
    Abstract: Polymerizable dental materials are provided containing at least one polymerizable monomer and/or polymer and a finely divided inorganic filler, said filler being present in an amount of about 10 to 90% based on the weight of the material and having a particle size within the range of 10 to 400 m.mu., said material when polymerized having an extremely high compressive strength, excellent transparency and a very smooth homogeneous surface.
    Type: Grant
    Filed: January 23, 1975
    Date of Patent: May 12, 1981
    Assignee: Perdent, GmbH.
    Inventors: Rudy Michl, Peter Wollwage