Abstract
A three-dimensional shape measurement system for making teeth models was assembled by using a high precision laser displacement meter and computer controlled scanning machine (CAMM-3). From the data obtained, reconstruction of the teeth model by CG (computer graphics) was attempted by means of a wire frame model program. The 7 molar abutment tooth was measured, and detailed features such as finishing line of margin or groove of gum retraction were reproduced by CG drawings. The time required for measurement was about 40 minutes by using the automatic model scanning system. Further measurement with a larger region of model sucu as 4〜7 was accomplished, and details such as wing or margin of abutment and fissure of molar were repreduced by CG drawings. Some disadvantages were recognized. For instance, error data are formed when the reflected beam is shaded by the model itself, or measurement is impossible at the the undercut portion of the model where the laser beam can't reach. Some improvements such as rotation or tilting of model will be required.
