具有伸缩弹性的固位体在活动义齿中应用的优点在很多文献中均有报道。因为这种固位体不仅可产生足够的固位力、均匀分散压力,而且改进了传统卡环影响美观的弊病。本文介绍的这种带圈顶盖就是一种改良了的弹性固位体。它独特之处于顶盖与它的上层结构之间存在一个富有弹性的小橡皮圈,这种圈状物放 Advantages of flexible retainers for removable dentures have been reported in many literatures. Because this retainer not only produces sufficient retention force, uniform pressure distribution, but also improves the traditional card ring affect the aesthetics of the ills. The loop covered cap described in this article is an improved, resilient retainer. It is unique in that there is a small elastic rubber band between the top cover and its superstructure,