目的研究后牙折裂综合治疗后的保存效果。

Objective To research the preserved effect with complex therapy of the fractured premolars and molars.

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引用折裂率的概念探讨牙折裂与年龄增长的相关性。

To discuss the relevance between tooth fracture and the age growing, the concept of fracture rate has been quoted.

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目的：了解金属全冠对舰艇人员折裂牙修复的作用。

Objective: To find out the effect of metal full crown in the restoration of seamen's split teeth.

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