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首页> 外文期刊>The International journal of oral & maxillofacial implants >Numeric simulation of time-dependent remodeling of bone around loaded oral implants.
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Numeric simulation of time-dependent remodeling of bone around loaded oral implants.

机译：口腔植入物周围骨骼随时间变化的重塑的数值模拟。

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PURPOSE: The objective of this study was to investigate the time-dependent biomechanics of marginal bone around osseointegrated dental implants within physiologic loading conditions. MATERIALS AND METHODS: The remodeling of marginal bone around a 4.1-mm-diameter, 10-mm-long implant was studied by implementing the Stanford theory into axisymmetric mathematical models simulating different bone support at the implant neck: 1-mm-thick cortical bone (model 1), 0.5-mm-thick cortical bone (model 2), absence of cortical bone (model 3), and absence of cortical bone with 0.5 mm of resorption of marginal trabecular bone (model 4). The results were examined separately for all models at five time intervals: the first loading after osseointegration and 3, 6, 9, and 12 months after osseointegration. Minimum principal stress, maximum principal stress, strain energy, total equivalent strain, displacement, average elastic modulus, and bone density were evaluated. RESULTS: In models 1 and 2, the magnitude of the stresses increased during the 1-year period. The distributions of stresses in models 3 and 4 were less variable and lower than models with cortical bone. The region of high stresses enlarged during the first 3 months and then decreased over time. There was a time-dependent increase in strain energy density around the neck of the implant in models 1 and 2. The time-dependent displacement values of implants were almost constant over time (maximum 1 Mum change). The lowest implant displacement values were observed in model 1. There was a slight increase in the elastic modulus of cortical bone and a decrease in trabecular bone (maximum 1% change). CONCLUSION: The time-dependent increase in stresses in the marginal zone of the implants with cortical bone support was higher than that of the implants supported solely by trabecular bone in the first year of function. Higher strain energy density around the implants with cortical bone support might indicate apposition and increase in interface stiffness, whereas lower strain energy density around implants supported solely by trabecular bone could be associated with skeletal tissue loss.
机译：目的：本研究的目的是研究在生理负荷条件下骨整合牙齿植入物周围边缘骨的时间依赖性生物力学。材料与方法：通过将Stanford理论应用于模拟对称于种植体颈部的不同骨支撑的轴对称数学模型，研究了直径4.1毫米，长10毫米的种植体周围的边缘骨重塑。 （模型1），厚度为0.5毫米的皮质骨（模型2），不存在皮质骨（模型3）和不存在皮质骨，且边缘小梁骨吸收为0.5毫米（模型4）。在五个时间间隔分别检查了所有模型的结果：骨整合后的第一次加载和骨整合后3、6、9和12个月。评估了最小主应力，最大主应力，应变能，总当量应变，位移，平均弹性模量和骨密度。结果：在模型1和2中，应力的幅度在1年期间增加。模型3和模型4中的应力分布与皮质骨模型相比，变化较小且较低。高应力区域在前三个月内扩大，然后随时间减小。在模型1和2中，植入物颈部周围的应变能密度随时间而增加。随着时间的推移，植入物随时间的位移值几乎恒定（最大1 Mum变化）。在模型1中观察到最低的植入物位移值。皮质骨的弹性模量略有增加，而小梁骨的减少（最大变化为1％）。结论：在功能的第一年中，皮质骨支持的植入物边缘区域的应力随时间的增加高于单纯小梁骨支持的植入物。具有皮质骨支撑的植入物周围较高的应变能密度可能表明并置并增加界面刚度，而仅由小梁骨支撑的植入物周围较低的应变能密度可能与骨骼组织丢失有关。

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