Method:46 mandibular molars with furcation involvement were treated by root canal therapy and root canal preparation.Then medical canal and distal canal were separated and casted post were made.

• 方法:将46例较为严重难治性根分叉病变下颌磨牙经完善根管治疗后分离近、远中根,根管预备后制备铸造桩核,以类似前磨牙形态进行桩冠修复。