冠根折 crown-root fracture
根冠 [植] root cap ; [植] calyptra ; czapeczka korzeniowa
冠根比 top root ratio
冠根比例 Crown-to-Root Ratio ; CRR ; proportion between crown and root
修复体冠根比例 Crown-to-Root Ratio ; CRR
种植修复体冠根比例 Crown-to-Root Ratio
冠根折断 tooth crown-root fracture
冠根位置 crown and root position
残根残冠根管治疗 root canal therapy of the residual roots and crowns
目的：观察根管治疗后的下颌磨牙冠缺损类型与冠根折的关系。
Objective: To evaluate the relationship between crown defect types and crown fractures of root-canal-treated mandibular molars.
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。
Objective:To observe the clinical effect of tooth extrusion with progressive methods for anterior teeth with crown-root fracture.
方法：通过观察4 7例冠根纵折的病例，对牙位、牙髓状态、牙髓治疗情况进行回顾性分析。
Methods: 47 cases were analyzed by respective study to analysis the cauese , clinical characters . diagnosis and prevention methods of vertical root fracture.
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