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.
磨牙可以适当放宽基牙选择的适应症，对于牙槽骨吸收至根分歧甚至更低的磨牙在保证牙周卫生、控制炎症的基础上仍可考虑作为固定桥的基牙。
We must use double abutments when the bone of premolar is re- duced. But molar can be selected as abutment even if its bone level was absorbed seriously.
分别在垂直载荷和斜向载荷下观察下颌第一磨牙磨牙半切术后不同固定修复设计对牙周支持组织应力分布情况。
The stress distribution of the reserved root with different prosthodontic design after hemisection therapy under the vertical loading and obliquely loading was observed.
分别在垂直载荷和斜向载荷下观察下颌第一磨牙磨牙半切术后不同固定修复设计对牙周支持组织应力分布情况。
The stress distribution of the reserved root with different prosthodontic design after hemisection therapy under the vertical loading and obliquely loading was observed.
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