选取矫治将要结束病例36例，着重从牙周卫生与保持效果两个方面对活动与固定保持进行对比研究。
The comparative study of fixed versus removable retainer 36 patients were selected and comparative study which include periodontal implications and stabilizing effects was performed.
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.
目的：建立单端固定桥修复下颌游离缺失的基牙及其牙周支持组织光弹模型。
Objective: to establish the Photoelastic Model of the abutment and periodontal tissue of mandibular unilateral distal-extension edentulous restored by cantilever fixed bridge.
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