Objective: To observe the methods of removing the bad prosthesis post pin.
2
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.
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.
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