Kinoshita Hideaki, Nakahara Ken, Matsunaga Satoru, Usami Akinobu, Yoshinari Masao, Takano Naoki, Ide Yoshinobu, Abe Shinichi
Department of Anatomy, Tokyo Dental College, 1-2-2 Masago, Mihama-ku, Chiba 261-8502, Japan.
Dent Mater J. 2013;32(4):637-42. doi: 10.4012/dmj.2012-175.
The aim of this study was to elucidate the association between the bone structure at implant insertion sites and stress distribution around the mandibular canal by means of three-dimensional finite element (3D FE) analysis. Four FE models were created with slice data using micro-computed tomography (micro-CT), and 3D FE analysis was performed. Mechanical analysis showed that the load reached the mandibular canal via the trabecular structure in all FE models. High levels of stress were generated around the mandibular canal when the distance between the mandibular canal and the implant decreased. High stress levels were also observed when cortical bone thickness and bone volume/total volume (BV/TV) were low. Our findings suggest that load is transmitted to the mandibular canal regardless of differences in the thickness of cortical bone or cancellous bone structure, but excessive load may be generated in bone with thin cortical and coarse cancellous structures.
本研究的目的是通过三维有限元（3D FE）分析，阐明种植体植入部位的骨结构与下颌管周围应力分布之间的关联。使用微型计算机断层扫描（micro-CT）的切片数据创建了四个有限元模型，并进行了3D FE分析。力学分析表明，在所有有限元模型中，载荷均通过小梁结构到达下颌管。当下颌管与种植体之间的距离减小时，下颌管周围会产生高水平的应力。当皮质骨厚度和骨体积/总体积（BV/TV）较低时，也观察到高应力水平。我们的研究结果表明，无论皮质骨或松质骨结构的厚度存在差异，载荷都会传递至下颌管，但皮质薄且松质结构粗大的骨中可能会产生过大的载荷。
