目的：观察松动基牙固定修复的临床疗效。
Objective: to observe the clinical therapy effects of loose abutment teeth with the fixed restoration.
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 observe the stress distribution of the FPD, which used the loosen teeth as abutments.
导致失败的主要原因为松动脱落、瓷崩和基牙病变。
The main causes of failure were lossing, dropping, porcelain cracking and pathological changing of the abutment.
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