The comparative study of fixed versus removable retainer 36 patients were selected and comparative study which include periodontal implications and stabilizing effects was performed.
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。
Objective: To study the influence on the displacement of abutment with various retainer designs for bilateral distal-extension removable partial dentures (RPDs).
目的：探讨双侧游离端可摘局部义齿的不同固位装置对基牙的影响。
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