Methods 16 cases with fracture or exfoliation on the area of anterior teeth and premolar were selected, the damage's parts of prosthesis were recorded, and the causes of failure were analyzed.
方法随机选择16例前牙和前磨牙区因瓷裂或瓷崩而导致失败的病例，记录修复体损坏的部位，分析产生失败的原因。
Method47 cases with fracture or exfoliation on the area of anterior teeth, premolar and molar were selected, the damage's pares of prosthesis were recorded, and the causes of failure were analyzed.
方法随机选择临床47例前牙和后牙瓷裂或瓷崩失败病例，记录修复体损坏的部位，分析产生失败的原因。
Objective:To observe the clinical effect of tooth extrusion with progressive methods for anterior teeth with crown-root fracture.
目的观察牙冠延长术治疗断缘位于龈下的冠根联合折断牙的临床效果。
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