Ben-Ur Z, Aviv I, Maharshak B
Tel Aviv University, Israel.
Quintessence Int. 1991 Jan;22(1):23-7.
Tissueward movement of the free-end saddle of a removable partial denture during function takes place around the most distal fulcrum created by the most mesial rests. Displacement because of sticky foods takes place around the fulcrum created by the most distal rests. These and other factors affecting displacement of the free-end saddle removable partial dentures are discussed, and designs intended to increase retention are presented. The forces applied to the most anterior and posterior axes of rotation can be calculated mathematically to reveal the hazards of a too-short lever arm in combination with a strong retentive clasp system.
可摘局部义齿游离端鞍基在功能状态下向组织方向的移动发生在由最靠近缺隙处的支托所形成的最远端支点周围。由于粘性食物导致的移位发生在由最远端支托所形成的支点周围。本文讨论了这些以及其他影响可摘局部义齿游离端鞍基移位的因素，并介绍了旨在增加固位的设计。作用于最前和最后旋转轴上的力可以通过数学计算得出，以揭示过短的杠杆臂与强大的固位卡环系统相结合所带来的风险。
