不同形状种植体支持单端固定桥的三维有限元分析

发布时间：2019-01-26 21:45

【摘要】：背景:种植体的形状影响其生物力学表现,目前对种植支持式单端固定桥的研究多在相同形状种植体进行,对不同形状种植体支持的单端固定桥的比较分析较少。目的:利用三维有限元建模,分析圆柱形、锥形与膨胀式3种种植体支持的单端固定桥在下颌后牙区的生物力学特征。方法:分别建立圆柱形、锥形与膨胀式种植体支持单端固定桥及其支持组织的三维有限元模型,对单端固定桥轴向90°和颊舌向45°分别施加300 N的力,分析皮质骨、松质骨的von Mises应力及种植体-基台复合体的最大位移。结果与结论:①在轴向和颊舌向加载力下,3种模型皮质骨的最大应力峰值远大于松质骨,皮质骨的最大应力峰值均集中于近悬臂种植体远中颈部周围;②膨胀式种植体模型在皮质骨中的最大von Mises应力值最低,在轴向加载力下尤其明显,在松质骨中的von Mises应力值最高;③与轴向加载力比较,颊舌向加载力下3种模型皮质骨、松质骨的von Mises应力峰值及种植体-基台复合体最大位移均增大;在颊舌向加载力下,膨胀式种植体模型的种植体-基台复合体最大位移最小;④结果表明,膨胀式种植体支持的单端固定桥稳定性最好。
[Abstract]:Background: the shape of implants affects their biomechanical performance. At present, most of the researches on implant-supported single-ended fixed bridges are carried out in the same shape implants. Objective: to analyze the biomechanical characteristics of three kinds of implant-supported single-end fixed bridges in the mandibular posterior teeth using three-dimensional finite element modeling. Methods: three dimensional finite element models of cylindrical, conical and expansion implant-supported single-ended fixed bridges and their supporting tissues were established, and the cortical bone was analyzed by applying 300N force to the axial 90 掳and 45 掳buccal and lingual direction of the single-ended implant respectively. Von Mises stress of cancellous bone and maximum displacement of implant-abutment complex. Results and conclusion: 1 under axial and buccal loading, the maximum stress of cortical bone of the three models was much higher than that of cancellous bone, and the maximum stress of cortical bone was concentrated around the distal neck of the proximal cantilever implant. (2) the maximum von Mises stress in cortical bone was the lowest in the expanded implant model, especially in axial loading, and the von Mises stress in cancellous bone was the highest. 3Compared with the axial loading force, the peak von Mises stress of cancellous bone and the maximum displacement of implant-base complex increased in the three model cortical bones under buccal and lingual loading. Under the buccal and lingual loading force, the maximum displacement of the implant-base composite in the expanded implant model is the minimum. 4 the results show that the stability of the single end fixed bridge supported by the expansion implant is the best.
【作者单位】：哈尔滨医科大学第一附属医院群力院区;
【分类号】：R783.6

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