螺距对支抗微种植体—骨界面影响的三维有限元分析
Three-dimensional finite element analysis for the influence of micro-implant pitch on micro-implant-bone interface
作者：颜丹，张锡忠，王增全，王建国，关泽建
Author：Yan Dan, Zhang Xizhong, Wang Zengquan, Wang Jianguo, Guan Zejian
收稿日期：2015-02-12 年卷（期）页码：2015,42(5):557-561
期刊名称：国际口腔医学杂志
Journal Name：International Journal of Stomatology
关键字：有限元分析,下颌骨,正畸支抗,微种植体螺距,
Key words：finite element analysis,mandible,orthodontic anchorage procedures,micro-implant,pitch,
基金项目：
佛山市科学技术局医学类科技攻关项目（2014AB00389）；佛山市卫生和计划生育局医学科研课题项目（2013201）
中文摘要
目的 分析螺距变化对微种植体—骨界面、微种植体的应力分布和位移的影响，为支抗微种植体的临床选择和优化设计提供理论参照。方法 运用Pro/E软件建立不同螺距的微种植体和下颌骨三维有限元模型，用Hypermesh软件对该模型进行网格划分，并在微种植体顶部施加与颌骨面平行的正畸力1.96 N，用ANSYS软件进行三维模拟计算。结果 微种植体—骨界面应力峰值集中在微种植体颈部和尖部，当螺距为0.5 mm时，微种植体颈部的Vonmises应力和位移峰值最小，分别为27 MPa和0.001 5 mm，且应力和位移曲线最为平缓。结论 螺距变化影响微种植体和微种植体—骨界面的应力分布。在本实验条件下，螺距为0.5 mm时，微种植体—骨界面、微种植体本身应力和位移最小。
英文摘要
Objective To analyze the stress distribution at micro-implant-bone interface and the displacement of microimplant based on different pitch and to apply the theoretical reference for choosing orthodontic anchorage micro-implant and optimize design of micro-implant. Methods The three-dimensional finite element models of micro-implant with different pitches and mandible were established by Pro/E; the elements were divided by Hypermesh. The force of 1.96 N was applied on the top of the implant parallel to the mandible surface to analyze the differences of the micro-implant displacement and that of the force on the micro-implant-bone interface. Results The maximum Von-mises stress focused on the neck and tip of micro-implant. The peak Von-mises stress and displacement on the neck of micro-implant are both the smallest, which are 27 MPa and 0.001 5 mm respectively, and the stress and displacement curves are the flattest at the pitch of 0.5 mm than that of other sizes. Conclusion The pitch of micro-implant influences the stress distribution on micro-implant and bone surface. The stress and displacement on both micro-implant-bone interface and micro-implant are both the smallest in the 0.5 mm case of other micro-implant parameters in this work.
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