种植体不同设计参数对下颌骨牙齿种植影响的生物力学分析
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大连大学 机械工程学院

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Biomechanical Analysis of the Effect of Different Implant Design Parameters on Mandibular Tooth Implantation
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    摘要:

    目的 建立不同设计参数的种植体-下颌骨模型,观测种植体及周围骨质应力分布,分析不同设计参数对下颌骨牙齿种植的影响,为口腔种植手术提供理论指导。方法 通过显微CT获取下颌骨及其牙齿的扫描图像,利用Mimics和Geomagic Studio将数据特征进行提取,导入到SolidWorks里面进行实体建模与装配。基于种植体的直径、螺纹深度、基台穿龈高度、螺纹形态等结构特征参数,设计八组有限元模型。将八组模型导入到ANSYS里面,在静态150N:垂直、斜向45°两种载荷下,分析骨组织和种植体的Von Mises应力峰值,探寻对Von Mises应力峰值最敏感的种植体结构参数变量。结果 斜向载荷比垂直载荷对颌骨会产生更大的应力峰值,在设计的四个结构参数变量中,种植体直径是影响皮质骨Von Mises应力峰值的关键因素;螺纹深度是影响松质骨Von Mises应力峰值的关键因素;基台穿龈高度也会对颌骨Von Mises应力峰值产生影响,但影响程度不如螺纹深度和种植体直径明显;螺纹形态对颌骨组织的Von Mises应力峰值几乎没有影响。结论 不同的种植体设计参数会影响颌骨不同组织的应力峰值,对于个性化种植需要慎重考虑种植体参数的选择。该研究可以为口腔种植体的结构参数设计提供更加严谨的理论指导,为口腔种植手术做好精准预测提供指导。

    Abstract:

    Objective To establish the implant-mandible model with different design parameters, observe the stress distribution of the implant and surrounding bone, and analyze the influence of different design parameters on the dental implant of the mandible, so as to provide theoretical guidance for oral implant surgery. Methods Scanning images of the mandible and its teeth were obtained through microscopic CT. Data features were extracted by Mimics and Geomagic Studio, and then imported into SolidWorks for solid modeling and assembly. Eight groups of finite element models were designed based on the structural characteristics of implant diameter, thread depth, height of abutment through gingiva, thread shape and other parameters. Eight models were imported into ANSYS to analyze the Von Mises stress peak of bone tissue and implant under static 150N: vertical and oblique 45° loads to explore the most sensitive structural parameter variables of implant to Von Mises stress peak. Results The stress peak value of jaw was larger under inclined load than that under vertical load. Among the four structural parameters, the diameter of implant was the key factor affecting the Von Mises peak value of cortical. Thread depth was the key factor affecting the Von Mises peak stress of cancellous bone. The peak value of Von Mises stress was also affected by the height of abutment through gingiva, but the effect was not as significant as the thread depth and the diameter of the implant. Thread shape had little effect on the peak Von Mises stress of jaw tissue. Conclusions Different implant design parameters can affect the stress peak of different tissues of the jaw, so it is necessary to carefully consider the selection of implant parameters for personalized implants. This study can provide more rigorous theoretical guidance for the design of the structural parameters of oral implants and provide guidance for the accurate prediction of oral implants.

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  • 收稿日期:2020-12-31
  • 最后修改日期:2021-02-26
  • 录用日期:2021-03-09
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