CONCLUSION: During the RCT of pulp gangrene and molars, particularity and exactitude of the operation should be enhanced.
结论：牙髓坏疽或多根管磨牙在根管治疗术中应加强治疗的细致性和精确性。
RESULTS: the occurrence of inter-appointment pain during the treatment of pulp gangrene and molars happened more often than that of the others.
结果：牙髓坏疽患牙、多根管磨牙在根管治疗术中约诊间痛机率较大。
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