The apical initial cells of the root top were arranged in cone shape and no typical histogen zones were found.
根的顶端原始细胞为圆锥状排列的原始细胞群，未见典型的组织原分区。
2
Result: Images based on cone beam CT can clearly display the spatial relationship between root and maxillary sinus as well as inferior alveolar nerve canal.
结果：锥型线束CT可清楚显示牙根与下牙槽神经管及上颌窦之间的解剖关系。
3
Circular cone gear design include: geometry calculation accuracy contacts intensity tooth root bending intensity accuracy, plus the value of the test items and business computing.