微植体锥度对即刻加载时界面应力分布影响的三维有限元分析

Interfacial stress distribution on immediately loaded micro-implant with different tapers: Finite element analysis

利用Pro/E和MIMICS等软件建立颌骨和不同锥度微植体的三维实体模型,然后导入有限元计算软件ABAQUS并建立微植体与颌骨即刻加载的有限元模型,模拟临床上即刻加载时颌骨的应力分布,观察微植体的锥度对界面应力的影响。随着锥度的增加,微植体颈部界面处颌骨上的应力逐渐减小,而在皮质骨和骨松质交界上方区域则应力有递增趋势。结果显示在即刻加载的情况下,建议临床选择有锥度的微植体作为口腔正畸支抗,但锥度不宜过大。

A three-dimensional solid model including mandible and micro-implant with different tapers was developed by the software of Pro/E and MIMICS. It was imported into the ABAQUS to establish a finite element model and stimulate stress distribution of mandible under immediate loading. With the increase of taper, the interface stresses adjacent to the neck of micro-implant anchorage showed a trend of decrease, but stress above the junction of cortical and cancellous bone increased. Results show that in the case of immediate loading, a micro-implant with taper but not too big should be selected as orthodontic anchorage in the clinic.