【摘要】 目的:分析不同角度的前方牵引力,在不同部位颅面复合体骨缝的应力变化特征。方法:使用头颅CT扫描数据,建立颅面复合体三维有限元模型,并在模型上分别加载与平面呈-40°、0°、+40°的前方牵引力,分析复合体上各个骨缝的应力变化特征。结果:当加载力值的方向与平面呈-40°时,各骨缝受到的应力明显小于加载力值与平面呈0°时或呈+40°时的应力。在加载情况相同时,颧额缝的应力最小。同一骨缝上不同点的应力值也不同。角度改变对鼻额-额颌缝和鼻颌缝的应力影响较大。结论:不同方向的前方牵引力,在颅颌骨缝上产生的应力大小不同,而以-40°时最小;在加载角度相同时,同一骨缝上不同的点受到的应力也不同。更多还原

【Abstract】 PURPOSE:To investigate the biomechanical changes of craniofacial skeleton sutures protraction on the craniofacial complex at different angles.METHODS: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°,0° or 40° with occlusal plane.Biomechanical changes on different sutures was investigated by means of finite element analysis.RESULTS:The stress on different sutures exhibited to be the least when protraction force was applied at the angle of -40° 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.CONCLUSIONS:The stress of all the craniofacial skeleton sutures is the least when protraction applied from the angle of -40° with occlusal plane.Moreover,the stress of different points on craniofacial skeleton sutures is not the same in the same condition.更多还原