不同类型卡环对基牙受力影响的光弹应力分析

用光弹实验应力分析方法,对设计弯制、铸造圈卡及“Ⅰ”型三种固位卡环臂的下颌单侧游离端义齿进行了垂直加载测试,观察了邻缺隙侧基牙根周应力情况。结果表明,在垂直负荷下,游离端义齿的固位或平衡卡环臂不影响近基牙受力的大小和方向;在近基牙受力方面,弯制卡环臂、铸造圈卡环臂及“Ⅰ”型卡环臂三者之间无明显差异;作用于可摘部分义齿的(牙合)力主要通过(牙合)支托传递至近基牙。

Photoelastic Stress Analysis of the Effect of Various Clasps on Abutment Tooth

The mandibular unilateral free end partial dentures at with wrought wire retentive clasp arm, cast circumferential retentive arm and I-bar retentive arm were tested under vertical loading and the stresses around the root of the tooth adjacent to a distal-extension base were observed by means of photoelastic stress analysis. The results show that the retentive clasp arm or reciprocal clasp arm in distal-exte-nsionremovable partial denture does not affect the magnitude and direction of the fore appliefd on abutment tooth and it is not obviously different among the three types of retentive clasp arm and the occlusal force created due to loading in the distal removable partial denture is transmitted to the abutment tooth primarily through the occlusal rest.