Objective:To explore the utilization of four angles coil cable root cap attachment in single side distalextension removable partial dentures.
目的：探讨四角圈簧根帽附着体在后牙游离缺失单侧修复中的应用。
2
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。
3
Objective: to establish the Photoelastic Model of the abutment and periodontal tissue of mandibular unilateral distal-extension edentulous restored by cantilever fixed bridge.