Influence of marginal bone resorption on stress around an implant - a three-dimensional finite element analysis
Influence of marginal bone resorption on stress around an implant - a three-dimensional finite element analysis
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DOI：
10.1111/j.1365-2842.2004.01413.x
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发表时间：
2005-04-01
影响因子：
2.9
通讯作者：
Miyakawa, O
中科院分区：
文献类型：
--
作者：
Kitamura, E;Stegaroiu, R;Miyakawa, O
据报道，稳定种植体在第一年功能性负载后平均边缘骨吸收约1 mm，随后每年损失约0.1 mm。然而，对种植体周围骨应力的有限元分析仅限于在没有任何骨吸收的情况下分析骨应力。因此，进行了三维有限元分析，以比较非吸收模型与具有两种深度（1.3和2.6 mm）和类型（水平吸收和角状缺损）的骨吸收的四个模型中的骨应力。在上部结构的中心分别施加轴向力和颊舌向力，计算最大等效应力。在无吸收和吸收模型中，骨应力的主要趋势（种植体颈部周围的最高应力集中，颊舌载荷下的应力高于轴向载荷，以及皮质骨中的应力高于松质骨中的应力）相同。骨应力分布在无吸收和水平吸收模型中相似，但与角状缺损模型不同。此外，两种骨吸收类型的骨应力值随骨吸收深度的变化也不同。因此，在FEA中，建议准确模拟种植体颈部区域的边缘骨形状。
Average marginal bone resorption of about 1 mm after the first year of functional loading, which is followed by an annual loss of approximately 0.1 mm, has been reported in stable implants. However, finite element analyses on bone stress around implants have been limited to analysing the bone stress in the absence of any bone resorption. Thus, a three-dimensional finite element analysis was performed to compare the bone stresses in a non-resorption model with those in four models with bone resorption of two depths (1.3 and 2.6 mm) and types (horizontal resorption and angular defects). Axial and bucco-lingual forces were separately applied to the center of the superstructure and the maximum equivalent stress was calculated. The main tendencies of bone stress (highest stress concentration around implant neck, higher stresses under bucco-lingual than axial load, as well as in the cortical than cancellous bone) were the same in the non-resorption and resorption models. Bone stress distributions were similar in the non-resorption and horizontal resorption models, but differed from those in the angular defect models. Moreover, the changes of the bone stress values with resorption depth differed for the two resorption types. Thus, in FEA, accurate simulation of the marginal bone shape in the implant neck region is advisable.