摘要
目的研究牙种植体表面多孔层厚度对周围骨应力分布的影响。方法通过采集健康成年男性的下颌骨CT三维数据进行三维重建,建立Ⅲ类下颌骨三维模型,运用UG NX8.0软件绘制实心的和4种不同表面多孔层厚度(0.5mm,1.0mm,1.5mm,全多孔)的种植体模型。将5种种植体模型依次与下颌骨模型进行配准、网格划分和赋予材料学参数,在种植体基台表面施加118.2N的15°斜向力,用ABAQUS有限元分析软件处理运算骨界面的应力。结果皮质骨和种植体颈部松质骨的应力峰值均随种植体表面多孔层厚度增加而增大(P<0.05),全多孔组最大(分别为58.3MPa和11.28MPa),实心组最小(分别为50.2MPa和9.68MPa)。种植体根端松质骨的应力峰值无显著差异(P>0.05)。结论在种植体表面引入多孔结构以及增加多孔层厚度,能增大种植体周围骨应力,缓解应力遮蔽效应。
Objective To investigate the effect of the surficial porous layer thickness of dental implants on the peri-implant bone stress distribution. Methods A series of computerized tomograohy（CT） images of the mandible from a normal adult male was obtained and a three-dimensional（3-D） model of type Ⅲ mandible was reconstructed. One solid implant model and four surficial porous implants models with different surficial porous layer thicknesses（0.5mm, 1.0mm, 1.5mm, entirely porous） were created by UG NX8.0 software. Models were registered, meshed and assigned with their material parameters. An oblique force of 118.2 N was applied on the abutment surface, and the stress on the peri-implant bone interface was calculated using ABAQUS finite element analysis software. Results The peak stress in the cortical bone and the cancellous bone near the implant neck increased with the surficial porous layer thickness of implants increasing（P 0.05）. The entirely porous group had the maximum peak stress（58.3MPa and 11.28 MPa, respectively）; the solid group had the minimum peak stress（50.2MPa and 9.68 MPa, respectively）. No significant difference in the peak stresses was observed in the cancellous bone near the apical area of the implants（P 0.05）. Conclusion An implant with a porous surface and thick surficial porous layer could increase the peri-implant bone stress and relieve the stress-shieding effect.
出处
《口腔材料器械杂志》
2016年第2期61-65,85,共6页
Chinese Journal of Dental Materials and Devices
基金
国家自然科学基金课题(81570948)
关键词
种植体
Ⅲ类下颌骨
表面多孔层厚度
有限元分析
Implant Type Ⅲ mandible
Surficial porous layer thickness
Finite element analysis
