目的：探讨拆除不良修复体桩钉方法。
Objective: To observe the methods of removing the bad prosthesis post pin.
结论：4种牙体修复材料均对牙髓细胞的生长无不良影响，具有良好的生物相容性。
CONCLUSION: the cytotoxic effect of 4 kinds of dental restorative materials on pulp cell was relatively low in vitro, which indicated that all the materials has good biocompatibility.
微渗漏可导致修复体松动脱落，继发龋齿甚至牙髓病等不良后果，是导致修复失败的主要因素，具有严重的危害性。
Notice Microleakage can cause secondary caries and restoration loose off even bad consequences, such as pulp disease, is one of the factors that lead to repair failure, has serious harm.
结果68件金属烤瓷冠发生牙龈炎中修复体边缘不合符要求占70.59%，修复体外形不合符要求占10.29%，邻接关系不良占19.12%。
Results Among the 68 metal ceramic crowns, 70.59% were found to be fringe unqualification, 10.29% with contour unqualification, and 19.12% with ill interproximal contacts.
结果68件金属烤瓷冠发生牙龈炎中修复体边缘不合符要求占70.59%，修复体外形不合符要求占10.29%，邻接关系不良占19.12%。
Results Among the 68 metal ceramic crowns, 70.59% were found to be fringe unqualification, 10.29% with contour unqualification, and 19.12% with ill interproximal contacts.
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