The effects of bone density and crestal cortical bone thickness on micromotion and peri-implant bone strain distribution in an immediately loaded implant: a nonlinear finite element analysis.
The effects of bone density and crestal cortical bone thickness on micromotion and peri-implant bone strain distribution in an immediately loaded implant: a nonlinear finite element analysis.
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骨密度和毛皮皮质骨厚度对立即加载植入物中微型和植入物周围骨骼应变分布的影响：非线性有限元分析。
DOI：
10.5051/jpis.2016.46.3.152
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发表时间：
2016-06
影响因子：
1.9
通讯作者：
Kirita T
中科院分区：
文献类型：
--
作者：
Sugiura T;Yamamoto K;Horita S;Murakami K;Tsutsumi S;Kirita T
本研究调查了骨密度和牙槽嵴皮质骨厚度在种植体放置部位的微动（种植体和骨之间的相对位移）和种植体周围的骨应变分布在即刻加载条件下的影响。建立了下颌后牙种植体的三维有限元模型。模拟各种骨参数，包括低或高松质骨密度，低或高嵴皮质骨密度，嵴皮质骨厚度范围为0.5至2.5 mm。模拟延迟和立即加载条件。向基台顶部施加200 N的颊舌斜向载荷。在低密度松质骨模型中，最大微动范围约为100 μm，而在高密度松质骨模型中，微动范围小于30 μm。在低密度松质骨模型中，嵴皮质骨厚度显著影响最大微动。种植体周围皮质骨的最小主应变受嵴皮质骨和松质骨密度的影响，延迟和即时加载的程度相同。在低密度松质骨模型下，即刻负荷，种植体周围皮质骨的最小主应变随着嵴皮质骨厚度的增加而降低。松质骨密度可能是避免即刻加载种植体过度微动的关键因素。嵴皮质骨厚度显着影响最大程度的微动和种植体周围的骨应变在低密度松质骨的模拟下立即加载。
This study investigated the effects of bone density and crestal cortical bone thickness at the implant-placement site on micromotion (relative displacement between the implant and bone) and the peri-implant bone strain distribution under immediate-loading conditions. A three-dimensional finite element model of the posterior mandible with an implant was constructed. Various bone parameters were simulated, including low or high cancellous bone density, low or high crestal cortical bone density, and crestal cortical bone thicknesses ranging from 0.5 to 2.5 mm. Delayed- and immediate-loading conditions were simulated. A buccolingual oblique load of 200 N was applied to the top of the abutment. The maximum extent of micromotion was approximately 100 μm in the low-density cancellous bone models, whereas it was under 30 μm in the high-density cancellous bone models. Crestal cortical bone thickness significantly affected the maximum micromotion in the low-density cancellous bone models. The minimum principal strain in the peri-implant cortical bone was affected by the density of the crestal cortical bone and cancellous bone to the same degree for both delayed and immediate loading. In the low-density cancellous bone models under immediate loading, the minimum principal strain in the peri-implant cortical bone decreased with an increase in crestal cortical bone thickness. Cancellous bone density may be a critical factor for avoiding excessive micromotion in immediately loaded implants. Crestal cortical bone thickness significantly affected the maximum extent of micromotion and peri-implant bone strain in simulations of low-density cancellous bone under immediate loading.