Perfect与Replace种植体延期负重颈部骨应力比较

目的：研究延期负重时Perfect种植体与Replace种植体颈部骨质应力分布情况。方：借助医用CT电子扫描技术、图像传输与转换技术以及三维有限元软件模拟建立上颌骨前牙区的三维有限元模型，分别模拟植入Perfect种植体及对照组的Replace种植体，比较分析两种种植体在即刻负重时牙槽嵴顶皮质骨的应力分布情况。结果：延期负重时，Perfect种植体在牙槽嵴顶部的等效应力和压应力略小于Replace种植体在牙槽嵴顶部的等效应力和压应力，拉应力则略大于Replace种植体在牙槽嵴顶部的拉应力。结论：延期负重条件下，Perfect种植体在牙槽嵴皮质骨的应力分布与Replace种植体相似，仅从生物力学方面考虑，Perfect种植体不会加快种植体颈部牙槽嵴的吸收速度。

Comparison of stress distribution at cervical bone between Perfect implant and Replace implant in delayed loading

Objective To research the stress distribution in cervical bone of Perfect implant and Replace implant in delayed loading.Methods The three-dimensional finite element(FEM)models of the maxilla anterior part were established by CT scanning,video transportation,transformation technology,three-dimensional finite element(FEM)approach,then the stress distribution at alveolar crest in FEM models of Perfect implant and Replace implant was analyzed.Results When Perfect implant was placed in bone and delayedly loaded,the Von Mises stress and compressive stress of alveolar crest were less than Replace implant in the same condition,while the tensile stress was more.Conclusion The stress distribution of cortical alveolar ridge in Perfect implant with delayed-loading is similar to that in Replace implant.Considering these results invitodynamics exclusively,Perfect implant won’t accelerate the bone resorption speed at cervical alveolar ridge.