Most of which happened in mesiobuccal canal of maxillary molar and mesial canal of mandibular molar, accounting for 70.7%.
器械折断于上磨牙近颊根管和下磨牙近中根管者居多，占70.7%。器械折断在根管中下段多见，占70%。
Result: the three-dimensional models of the first maxillary molar residual root restored with post-core crown were generated.
结果：建立了上颌第一磨牙残根桩核冠的三维有限元模型。
Objective: To evaluate the clinical applications and therapeutic effect of maxillary sinus floor lifting and dental implantation in the patients of maxillary molar missing.
目的：探讨上颌窦提升术在上颌磨牙缺失种植修复术中应用及疗效情况。
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