上颌复合体两种工况下上颌窦区三维有限元分析

目的：了解正常上颌复合体在不同状态相同载荷条件下，上颌窦区的应力分布变化情况，进一步探讨其本身的生物力学行为特征。方法：在自主建立的三维有限元模型基础上，利用ANSYS软件分别模拟张口位和正中咬合时上颌复合体的边界条件，计算并绘制出2种工况下上颌窦区各种应力的数据和图像。结果：正常上颌窦在正中咬合和张口位2种状态下，双侧第一磨牙受垂直集中压力作用，其各部位应力值均较小；当受到相同的载荷作用时，应力大小是不相等的。正中咬合时应力值小于张口位。结论：正常上颌窦各壁应力值在2种工况下均远远小于加载力，其中张口位应力分布不如正中咬合时均匀。

Three-dimensional finite element analysis of the maxillary sinus region under the same load in different conditions

Objective: To find the changes of stress distribution in the maxillary sinus region of normal maxillary complex under different conditions, and explore the feature of biomechanical reaction of this complex. Methods: Simulating the different boundary conditions at open-mouth position and during centric occluding, the characters of stress distribution are analyzed and compared by three dimensional finite element method. Results: The values of stresses in normal maxillary sinus during centric occluding and at open-mouth position are very small. But the stress at open-mouth position is much higher than that during centric occluding under the same loading. Conclusion: Maxillary complex may play the role of dispersing applied concentrated forces. The function of maxillary sinus must be considered during the study process of maxillary complex biomechanics.