Patents Assigned to Masaru Yamaska
  • Dental system for treating a root canal
    Patent number: 5017134
    Abstract: The present invention relates to dental equipment for treating a root canal. According to the present invention, two input signals with different frequencies are superposed. The difference between impedances corresponding to the two different frequencies at a given position in the root canal where the impedances hardly vary, is obtained. This value and a clinically determined value are used to detect the desired position in the root canal.
    Type: Grant
    Filed: April 6, 1990
    Date of Patent: May 21, 1991
    Assignees: Tsuyoshi Saito, Masaru Yamaska, Masaichi Tanaka
    Inventors: Tsuyoshi Saito, Masaru Yamaoka