Nippon Avionics Co., Ltd.

Takao Hoshiai

Sumiya Hobo

Tomohide Inada

Hisao Takayama

Toshio Nara

Katsutoshi Umetani

Keisuke Akamatsu

Motoyuki Totsuka

Masao Kashiwada

An apparatus for measuring the three-dimensional position and attitude of upper and lower clutches attached on patient's maxillary and mandibular teeth for computerized measurement of the mandibular movements necessary for the fabrication of dental prostheses is disclosed. The apparatus includes a part of a sphere that is fixed to the mandible and which is marked with a reference line and a part of another sphere of substantially the same radius as that of the above sphere, which is fixed to the maxilla and which is also marked with a reference line. The surfaces of the two spheres are caused to slide against each other, with their centers being in alignment, thereby achieving the measurement of the relative attitude of the two spheres.

Apparatus for determining the three-dimensional position and attitude

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Tokyo, Japan

Takao Hoshiai