Biomechanical role of peri-implant cancellous bone architecture.
Biomechanical role of peri-implant cancellous bone architecture.
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发表时间：
2010
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通讯作者：
S. Matsunaga;Y. Shirakura;T. Ohashi;K. Nakahara;Y. Tamatsu;N. Takano;Y. Ide
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作者：
S. Matsunaga;Y. Shirakura;T. Ohashi;K. Nakahara;Y. Tamatsu;N. Takano;Y. Ide
目的探讨下颌骨种植体周围骨小梁的生物力学作用。材料和方法本研究中的模型是使用显微计算机断层扫描数据从尸体中取得的，其中骨内种植体在死亡前已经就位15年。进行形态学分析和三维（3D）有限元分析，以计算精确模拟骨小梁结构的模型的种植体周围载荷路径。结果通过多尺度分析，使用均匀化方法，种植体周围的松质骨结构是各向同性的大部分。此外，三维有限元分析表明，斜向种植体轴的压缩应力被传递到下约束表面;斜向种植体轴的拉伸应力被传递到上约束表面，并且它们在垂直载荷下相互抵消。松质骨中的最高应力在垂直载荷下观察到，并且在小梁中产生的应力在接近水平载荷时降低。结论种植体周围松质骨结构基本上是各向同性的。三维有限元分析表明，种植体周围松质骨小梁通过形成载荷传递路径分散应力。结果表明，松质骨在支持通过植入物施加的功能性压力方面起主要作用。
PURPOSE The aim of this study was to investigate the biomechanical role of trabecular bone around dental implants in the mandible. MATERIALS AND METHODS The model in this study was made using micro-computed tomography data taken from a cadaver in whom endosseous implants had been in place for 15 years prior to death. Morphologic analysis and three-dimensional (3D) finite element analysis were performed to calculate the peri-implant loading path of the model in which the trabecular structure was accurately simulated. RESULTS As seen through multiscale analysis using the homogenization method, the trabecular bone architecture around implants was isotropic for the most part. Also, 3D finite element analysis showed that compressive stresses oblique to the implant axis were transmitted to the lower constrained surface; tensile stresses oblique to the implant axis were transmitted to the upper constrained surface, and they intersected each other with vertical loading. The highest stress in cancellous bone was observed on perpendicular loading, and stress produced in trabeculae decreased approaching horizontal loading. CONCLUSION Cancellous bone architecture around the implant was generally isotropic. 3D finite element analysis showed that cancellous bone trabeculae around implants dispersed stress by forming load transfer paths. The results suggest that trabecular bone plays a major role in supporting functional pressure exerted via the implant.