不同螺纹形态的圆柱状2D种植体的即刻力学分析

发布时间：2018-03-20 16:01

本文选题：有限元方法　切入点：牙种植体　出处：《西安科技大学学报》2017年02期 　论文类型：期刊论文

【摘要】：为研究不同螺纹形态的圆柱状2D种植体的即刻力学,建立了简化的种植体—牙槽骨的参数化模型,骨块简化为内部为松质骨外部为皮质骨的矩形方块,在骨块上建立圆柱形螺纹种植体及牙槽骨,牙槽骨和种植体简化为一个整体。采用有限元方法,对不同螺纹形态种植体轴向截面应力应变在不同承载特征下的变化规律并进行了对比分析。结果表明,在混合加载作用下,种植体—牙槽骨的应力、应变及变形分布更趋均匀,表明相邻牙槽骨之间的反作用力即水平加载对应力分布的影响是不可忽略的。当螺纹角度在30°~60°时,顶角为45°的螺纹形态应力集中现象严重;顶角为60°的螺纹形态应力、应变及变形最小。为避免应力过度集中产生的二次伤害,应采用顶角为60°的螺纹形态,有利于应力在皮质骨、松质骨区域更合理的分散,可延缓皮质骨表面的骨吸收,为种植体的螺纹设计提供参考依据。
[Abstract]:For the immediate mechanical cylindrical 2D implants of different thread form, a parametric model of implant alveolar bone of the simplified, simplified as internal bone cancellous bone for external rectangular blocks of cortical bone, a cylindrical threaded implant and alveolar bone in bone, alveolar bone and implant simplified as a whole. By using the finite element method, the different forms of implant thread axial stress and strain in different load variation characteristics under were analyzed and compared. The results showed that in the mixed loading, the stress of implant alveolar bone, strain and deformation of more uniform distribution, that between adjacent the reaction effect of alveolar bone level loading stress distribution can not be ignored. When the thread angle in 30 degrees ~60 degrees, 45 degrees angle for the thread shape of the stress concentration phenomenon is serious; the thread form angle for 60 degrees should be Stress, strain and deformation minimum. Two damage to avoid excessive stress concentration generated, should use the thread form angle for 60 degrees, is conducive to the stress in cortical bone, cancellous bone loose dispersed area is more reasonable, can delay the cortical bone surface of bone resorption, provide reference for the design of implant thread.

【作者单位】：西安科技大学理学院;
【基金】：国家自然科学基金(11502196) 中国博士后科学基金面上资助(2015M580865) 陕西省教育厅专项科研项目(15JK1483) 陕西省博士后科研项目(2016BSHEDZZ77)
【分类号】：R783.6

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