Abstract
Tooth carving practice is very important to make students understand the anatomical forms of human teeth and to make them study the basic technique necessary to reproduce crown forms in the process of preparing prosthetic applicance.
Therefore, in the present studies the author makes out the design cut method (A), design mode technique our school adopted, and as preliminary studies purposing to improve tooth carving technique, selects Obana's (B), dessin mode one and the direct carving method (C), to be compared with our design cut method.
The author makes 30 beginners, out of the freshmen in 1985, operate, by themselves, the upper right central incisor, upper right first premolar and the upper right first molar, by the above-mentioned 3 kinds of methods, to evaluate their respective products from the overall viewpoints, and examine the dimensional errors, comparing them with the standard models. The results are as follows:
1. It proves that the products carved by the A, B and C methods are all evaluated low, less than 3 points, and that there is no remarkable difference due to the carving methods.
2. Dimensional errors prove to be 15-20% in the central incisor and premolar cases and 10% in the molar case.
3. Those carved by A and B methods shown an insufficient carving tendency, while those carved by C method show both excessive and insufficient carving tendencies.
