方法148例患者共165颗后磨牙拔除，术毕保留牙根间隔高度。
Methods 165 molars in 148 cases were pulled out, hold back the height of interradicular after operation.
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。
Methods Hemisections were performed on reserved canals of incomplete tooth fracture, complete root fracture and furcation involvement after root canal therapy.
双端固定桥设计优于单端固定桥，更好的分散了半切后保留牙根的牙周膜的负担，有利于半切术后余留牙根的牙周支持组织健康。
The design of rigid fixed bridge is superior to free-end fixed bridge and be propitious to the the health of the reserved root by dispersing the stress of reserved root more effectively.
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