一次性根管治疗术分根术牙冠延长术桩核联冠联用于下颌第一磨牙残根残冠临床观察
일차성근관치료술분근술아관연장술장핵련관련용우하합제일마아잔근잔관림상관찰
Cliclinical observation of one-visit root canal therapy root separation crown lengthening surgery and combined post-and-core crown to the residual root or crown of the mandibular first molar
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