影响微螺钉种植体周围皮质骨内应力的因素：三维有限元研究。
Factors affecting stresses in cortical bone around miniscrew implants: a three-dimensional finite element study.
机构信息
Department of Orthodontics, University of Illinois at Chicago, Chicago, IL 60612, USA.
出版信息
Angle Orthod. 2012 Sep;82(5):875-80. doi: 10.2319/111011-696.1. Epub 2012 Mar 5.
OBJECTIVE
To evaluate various types of stress in cortical bone around miniscrew implants using finite element analysis.
MATERIALS AND METHODS
Twenty-six three-dimensional assemblies of miniscrew models placed in alveolar bone blocks were constructed using Abaqus (Dassault Systèmes Simulia Corp, Providence, RI), a commercial finite element analysis software package. The model variables included implant design factors and bone-related factors. All miniscrew implants were loaded in the mesial direction with a linear force equal to 2 N. Peak von Mises and principal stress values in cortical bone were compared between the different models for each factor.
RESULTS
The results demonstrated that some factors affected the stresses in bone (implant diameter, implant head length, thread size, and elastic modulus of cancellous bone), while other factors did not (thread shape, thread pitch, and cortical bone thickness).
CONCLUSIONS
Miniscrew implant diameter, head length, and thread size as well as the elastic modulus of cancellous bone affect the stresses in cortical bone layer surrounding the miniscrew implant and may therefore affect its stability.
目的
通过有限元分析评估微型种植体周围皮质骨的各种类型的应力。
材料和方法
使用商业有限元分析软件 Abaqus（达索系统 Simulia 公司，普罗维登斯，RI）构建了 26 个置于牙槽骨块中的微型种植体模型的三维组件。模型变量包括种植体设计因素和与骨相关的因素。所有微型种植体均在近中方向加载 2N 的线性力。针对每个因素，对不同模型中皮质骨中的峰值 von Mises 应力和主应力值进行了比较。
结果
结果表明，某些因素（种植体直径、种植体头部长度、螺纹尺寸和松质骨弹性模量）会影响骨中的应力，而其他因素（螺纹形状、螺纹间距和皮质骨厚度）则不会。
结论
微型种植体的直径、头部长度和螺纹尺寸以及松质骨的弹性模量会影响微型种植体周围皮质骨层的应力，从而可能影响其稳定性。
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