眶部种植体长度对骨界面应力影响的三维有限元研究

发布时间：2018-03-07 14:57

本文选题：眶部种植体　切入点：应力分布　出处：《华西口腔医学杂志》2014年05期 　论文类型：期刊论文

【摘要】：目的探讨不同长度的眶部种植体对骨界面应力分布的影响。方法建立直径3.75 mm,长度分别为3、4、6、10 mm的眶部种植体—颅颌面骨三维有限元模型,分别给予沿种植体轴向和与轴向成45°的载荷,载荷大小20 N,记录两种方向载荷下种植体及骨界面的Von-Mises应力峰值和位移峰值,分析其应力分布。结果施加沿种植体轴向载荷时,种植体周围应力集中于根部,种植体受力大于骨面;施加与轴向成45°载荷时,应力集中于种植体颈部与第一螺纹之间,种植体受力大于骨面。施加两个方向的载荷时,3 mm种植体的应力峰值明显大于其他长度种植体,而位移峰值无明显变化。在相同长度下,施加沿种植体轴向载荷时的应力峰值及位移峰值均明显低于与轴向成45°载荷时,载荷方式对界面应力分布有明显的影响。结论临床上尽量选择4 mm以上的眶部种植体;应用3 mm种植体时,应选择骨密质较厚的区域植入。
[Abstract]:Objective to investigate the effect of orbital implants of different lengths on the stress distribution of bone interface. Methods the three-dimensional finite element model of orbital implant-craniofacial bone was established with a diameter of 3.75 mm and a length of 6 10 mm. The Von-Mises stress peak and displacement peak value of implant and bone interface were recorded and the stress distribution was analyzed when applied along the implant axial direction and 45 掳axial load, the load size was 20 N, respectively, under the two direction loads, the peak value of Von-Mises stress and the displacement peak value of the implant and bone interface were recorded, and the stress distribution was analyzed when applied along the implant axial load. The stress around the implant is concentrated at the root, and the implant is subjected to a greater force than the bone surface; when the axial load is 45 掳, the stress is concentrated between the neck of the implant and the first thread, The stress of the implant is larger than that of the bone surface. When applied in two directions, the peak stress of the implant of 3 mm is obviously larger than that of the other implants, but the peak displacement of the implant does not change obviously. The stress peak and displacement peak along the implant axial load are obviously lower than that of 45 掳axial load, and the stress distribution at the interface is obviously affected by the loading mode. Conclusion the orbital implant above 4 mm is chosen as far as possible in clinic. When 3 mm implants were used, the area with thicker bone dense substance should be selected.
【作者单位】：广东省中医院口腔科;中山大学附属第一医院口腔科;台州市第一人民医院消化内科;
【基金】：广东省科技厅社会发展基金资助项目(2010B06090007-0) 国家自然科学基金面上项目资助项目(81371111)
【分类号】：R782.2

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