你刷牙的时候牙龈出血吗？
Objective:To observe the stress distribution of the FPD, which used the loosen teeth as abutments.
前言： 目的：观察松动牙作基牙时，固定桥支持组织的应力分布。
Objective: To determine the dynamic characters of bite force changing in rhythmic tapping and opening-closing with maximal force in loosen teeth.
目的：研究紧咬、叩齿运动中松动牙牙合力的动态变化特征。
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