4．根叉病变（Furcation involvement）： 36．46．grade I（L&B） （三）放射线检查（Radiographic finding） 1．垂直骨缺损（Angular bony defect）：12，11，21，22 ...
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Conclusion: Root trunk concavities may cause furcation involvement and reduce the efficacy of periodontal therapy.
结论：根柱凹陷可能是造成根分叉病变的原因，并可能是导致牙周治疗效果欠佳的原因。
Methods Separating roots was used for the conservative prosthetics of 24 mandibular posterior teeth with furcation involvement.
方法对下颌后牙残根、残冠累及根分叉病变的24个患牙，采用分根法作保存修复。
Methods Hemisections were performed on reserved canals of incomplete tooth fracture, complete root fracture and furcation involvement after root canal therapy.
方法选择隐裂、根折或根分叉病变患者，对欲保留牙根进行根管治疗后，行半牙切除术。
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