不同形式半固定桥基牙和牙槽骨电测应力分析

Stress analysis for the abutments and the supporting alveolar bone in semi- fixed bridge

采用电阻应变片电测技术,在具有模拟双侧颞肌、嚼肌和颞下颌关节盘、胎关系正常的头颅综合力学模型上,对右下颌第二双尖牙缺失区分别用T型栓道式半固定桥和胎支托式半固定桥(简称T栓道式桥)修复后,模拟产生正中(牙合)位及正中(牙合)位下的早接触,测试基牙和牙槽骨受力后的应力分布。结果:早接触增加半固定桥早接触区基牙和牙周组织的负担。依早接触区牙位的不同和活动连接体形式的不同,其应力分布有异;正中(牙合)位早接触时,T栓道式桥存在应力缓冲作用,(牙合)支托式桥则缓冲作用不明显。

This research was made in a mandibu-lar that simulated dynamic relationship between occlusion, masticatory muscles and TMJ and that has full and normal teeth excepting the right second premolar was lost. This study measured and analysed the stress distribution and changing in the abutments and the supporting alveolar bone with strain gauge when the edentulous area was restored by T-type attachment and rest type connectors semifixed bridge. The results suggested that: 1. The stress of the abutments and alveolar bone increased by prematurity and it's distribution and changing were different according to the place of prematurity and type of the connectors. 2. T-type connector has stress broken action and rest connector hasn't obvious such an action when prematurity of central occlusion.