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。

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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。

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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.

圆锥齿轮的设计包括：几何尺寸的计算，校核接触强度，齿根弯曲强度校核，齿轮各检验项目及公差值的计算。

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