| 摘要 |
EP--86167 A The milling tool is mounted in a rotary holder driven by e.g. an air turbine, and can be displaced in three directions by stepping motors associated with respective angular data converters. The movements of the tool and measurements of the instantaneous resistance encountered by it are detected, recorded and processed by logic units. - The digital data thus obtained are used to define the shape and thickness of a crown for the truncated tooth, and to control the movement of a machine tool for its mfr. The appts. eliminates risk of errors in mfr. of crowns and esp. of bridges bearing upon several stumps. The system is intended for tooth treatment or denture preparation. (0/35) DEAB- DE3203937 C The system cleans or corrects at least one tooth or prepares at least one tooth for prosthetic restoration and makes the restoration. The patient's head and lower jaw are fixed. The contours of the tooth are scanned and the values stored for use as the outer contour of the firmly-seated prosthetic restoration. - The tooth substance is removed down to the root. The root is then scanned and its values stored for use as the inner contour of the restoration. The stored contours are then used to make the restoration automatically using solid material. The restoration is finally connected to the tooth. |
