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。
To remove an abutment using forceps grasp the abutment with a definite purchase and apply a simultaneous twisting and pulling motion to release the abutment from the implant.
要拔除一颗支台是用钳子抓牢支台，同时加上旋转及拔起动作即能将支台离开植体。
With the construction of highway developing in the mountains, high filling embankment behind abutment will be inevitably encountered.
随着高等级公路建设在山区的开展，不可避免地会遇到桥头高填路基问题。
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