全下颌牙种植义齿及支持组织应力的三维有限元分析Ⅵ.不同上部结构对覆盖种植义齿应力分布的影响

采用三维有限元方法 ,考察了不同的上部结构设计 ,包括套筒冠、杆卡式附着体、改良杆卡式附着体对全下颌种植覆盖义齿及其支持组织在正中情况下应力分布的影响。结果发现杆卡式附着体的使用可降低种植体及剩余牙槽嵴表面的应力 ,但使界面应力增加。改良杆卡式附着体不利于种植体及骨界面的应力分布。

A Three-Dimensional Finite Element Stress Analysis of Implant-Supported; Prosthesis and Its Supporting Tissue in the Edentulous Mandible;Part 6. The Influence of Superstructure in Mandibular Complete Implant; Overdenture and Its Supporting Tis

The effect of superstructure, including telescope, conventional bar and modified bar, on the stress distribution of mandibular complete implant overdenture and its supporting tissue was investigated in this study. The results dernonstrated that bar could lower the extreme principle stress of the implant, but the stress distribution of implant bone interface was better when the implants were not linked with each other. Modified bar is not preferred because it increases the stress of implant and its interface.;