Conclusion It is feasible to count the thickness of the wall and the root canal area at middle root level and 1/3 level of root apiex in the basis of the values of the dental cervix.

• 牙颈部根管横截面分为：圆形、椭圆形、半月形和不规则形，根中部及根尖1/3部根管横截面分为：圆形和椭圆形。结论利用牙颈部根管壁厚度和面积推测根中部及根尖1/3部相应部位的根管壁厚度和面积是可行的。