197个透明后牙的制备与根管形态的观察

Preparation of 197 transparent posterior teeth and observation of types of shape of root canals.

１９７个透明牙（前磨牙和磨牙）经制备并作根管的形态学观察。结果显示４型根管形态。并对根管形态学的临床意义进行讨论。

transparent posterior teeth were prepared and types of shape of their root canals were observed.Results showed there were four types of the shape of root canals.The clinical significance of types of shape of root canals was also discussed.