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目的探讨不同牵引方向和牵引力值作用下整体后牵引上牙列,牙弓中各牙及平面变化的生物力学机制。方法使用MIMICS和ANSYS软件建立人鼻上颌骨复合体三维有限元模型,利用ANSYS软件分析不同牵引角度和力值作用下,上牙列各标志点在三维方向上的位移变化和应力分布。结果不同牵引角度远中移动上牙列,对平面旋转牵引具有一定影响;当牵引力为2 N时,上颌骨各部分应力最小,分布最为均匀。结论后牵引远中移动上牙列时,应注意牵引力值和牵引角度的使用,为控制平面旋转提供理论依据。
OBJECTIVE: To investigate the biomechanical mechanism of post-traction total dentition and dental arch changes in different directions and traction forces. Methods Three-dimensional finite element model of human nasal maxillary complex was established by using MIMICS and ANSYS software. The displacement and stress distribution in the three-dimensional direction of the upper dentition with different traction angles and force values were analyzed by ANSYS software. Results The distraction of the upper dentition with different traction angles had some influence on the plane rotation traction. When the traction force was 2 N, the stress in the maxilla was the smallest and the distribution was the most uniform. CONCLUSIONS: When using traction to move the upper dentition in the distance, attention should be paid to the use of tractive force and traction angle to provide a theoretical basis for controlling the plane rotation.