Motoyoshi Mitsuru, Shimazaki Takahisa, Hosoi Kohei, Wada Mizuki, Namura Shinkichi
Department of Orthodontics, Nihon University School of Dentistry, Tokyo, Japan.
Eur J Orthod. 2003 Apr;25(2):135-8. doi: 10.1093/ejo/25.2.135.
The biomechanical effects on cervical vertebral columns (C1-C7) during mastication were calculated using a three-dimensional (3D) finite element method. To verify the biomechanical influences of vertical occlusal alteration to the cervical column, three finite element models (FEM) showing a normal (model A), a steep (model B), and a flat occlusal plane (model C) were constructed. The occlusal stress distribution showed various patterns for the three models; the stress extended to the anterior area as the occlusal plane became steeper. The plots of the stresses on the mid sagittal section of the cervical columns showed different patterns for the three models; the stress converged at the odontoid process in models A and B, whereas the stresses at C7 in model B tended to decrease compared with model A. Concentrated stress was observed at C5 in model C, supporting the hypothesis that vertical occlusal alteration could influence stress distribution in the cervical columns.
使用三维（3D）有限元方法计算咀嚼过程中对颈椎柱（C1 - C7）的生物力学影响。为了验证垂直咬合改变对颈椎柱的生物力学影响，构建了三个有限元模型（FEM），分别显示正常（模型A）、陡峭（模型B）和平坦咬合平面（模型C）。三个模型的咬合应力分布呈现出不同模式；随着咬合平面变得更陡峭，应力延伸到前部区域。颈椎柱矢状中截面的应力图在三个模型中呈现出不同模式；模型A和B中的应力在齿突处汇聚，而与模型A相比，模型B中C7处的应力趋于降低。在模型C的C5处观察到集中应力，支持垂直咬合改变可能影响颈椎柱应力分布这一假设。
