Sha Yan, Deng Ying, Fu Shi-yu, Lv Chao-xian, Yan Xiao-jun, Yang Lin
Department of Stomatology, China-Japan Friendship Hospital, Beijing 100029, China.
Shanghai Kou Qiang Yi Xue. 2009 Jun;18(3):277-81.
To investigate the biomechanical changes of craniofacial skeleton sutures protraction on the craniofacial complex at different angles.
A three-dimensional finite element method (FEM) was developed from CT scan images by the technologies of three-dimensional reconstruction, image processing and meshing. The protraction force was applied to labial surface of the maxillary canine respectively from the angle of -40 degrees, 0 degrees or 40 degrees with occlusal plane. Biomechanical changes on different sutures was investigated by means of finite element analysis.
The stress on different sutures exhibited to be the least when protraction force was applied at the angle of -40 degrees with occlusal plane. Meanwhile, stress of frontozygomatic sutures was less than that of other sutures at the same condition. The stress of different points on craniofacial skeleton sutures was not the same in the same condition. Changes of the angles of protraction especially affected the stress of the frontomaxillary- nasalofrontal suture and nasalomaxillary suture.
The stress of all the craniofacial skeleton sutures is the least when protraction applied from the angle of -40 degrees with occlusal plane. Moreover, the stress of different points on craniofacial skeleton sutures is not the same in the same condition.
研究颅面骨骼缝线在不同角度牵引时对颅面复合体的生物力学变化。
通过三维重建、图像处理和网格划分技术，从CT扫描图像中开发三维有限元方法（FEM）。分别从与咬合平面呈-40度、0度或40度的角度对上颌尖牙唇面施加牵引力。通过有限元分析研究不同缝线的生物力学变化。
当牵引力与咬合平面呈-40度角施加时，不同缝线的应力最小。同时，在相同条件下，额颧缝的应力小于其他缝线。在相同条件下，颅面骨骼缝线上不同点的应力不同。牵引角度的变化尤其影响额上颌-鼻额缝和鼻上颌缝的应力。
当从与咬合平面呈-40度角的角度进行牵引时，所有颅面骨骼缝线的应力最小。此外，在相同条件下，颅面骨骼缝线上不同点的应力不同。
