Shifman A, Ben-Ur Z
Department of Oral Rehabilitation, Sheba Medical Center, Tel Hashomer, Israel.
Br Dent J. 2000 Mar 11;188(5):246-8. doi: 10.1038/sj.bdj.4800443.
Sound mandibular first premolars can be used as sole abutments for bilateral distal-extension removable partial dentures, if the denture is designed to minimise the torque applied to the abutment teeth. A simplified modification of the conventional torque-releasing clasp-assembly designs is suggested for these teeth. This modification entails a mesial rest on each abutment tooth connected to the distal proximal plate via a lingual bracing arm. A circumferential clasp arm is optional for buccal retention of the removable partial denture. As with conventional designs, the metal framework is designed to permit some rotational tissueward movement of the distal extension bases, yet not compromise the retention and stability of the prosthesis.
健康的下颌第一前磨牙可作为双侧远中游离可摘局部义齿的唯一基牙，前提是义齿设计能将施加于基牙的扭矩降至最低。针对这些牙齿，建议对传统的扭矩释放卡环组件设计进行简化改良。这种改良包括在每个基牙上设置近中支托，通过舌侧支托臂与远中邻面板相连。可摘局部义齿的颊侧固位可选用环形卡环臂。与传统设计一样，金属支架的设计应允许远中延伸基托向组织方向有一定的旋转移动，但不影响修复体的固位和稳定性。
