Objective:To study the impact of palatal scar force on the maxilla with unilateral cleft palate by finite element model. Methods:A 3-dimension finite element model of maxilla with cleft palate containing soft tissue was established,the soar force on the maxilla was analyzed by ansys.Results:Cleft area was identified as the center of rotation,cleft side of the maxilla reflected clock-wise rotation and non-cleft side anticlockwise rotation.The maxilla moved from outside to inside in cross section and front to back in the sagittal plane,and the former was greater than the latter.The outside of alveolar process was subjected to stress of mainly drawing force,the inside to stress of mainly compressive force.The deformation of maxilla was mainly in the front-end.Deformation of the alveolar was greater than that of maxilla body.Among deformations of three dimensions,the width was the largest,the length was the smallest,and the height was between both above.Conclusion:Along with the rotation of the maxilla,cleft area becomes gradually smaller.Among the three dimensions,the width is the largest,the length is the smallest and the height is between the both.The af-fect on maxilla is mainly in the front-end.The affect on the alveolar is greater than that on the maxilla body.%目的：探究腭部瘢痕力对腭裂上颌骨的作用机制。方法：利用Ansys 软件在含有腭板软组织腭裂上颌骨三维有限元模型上，添加腭部瘢痕力并对腭裂上颌骨进行受力分析。结果：腭部瘢痕力作用下腭裂上颌骨以裂隙区为中央，非裂隙侧上颌骨顺时针旋转，裂隙侧上颌骨逆时针旋转；形变动画表明：两侧上颌骨在横断面上由外向内，在矢状面上由前向后移动，且前者程度大于后者；牙槽突外侧受到以拉伸力为主的应力，内侧受到以压缩力为主的应力；上颌骨前段的形变大于后段；牙槽突形变量较颌骨体明显；上颌骨形变位移：宽度＞高度＞长度。结论：两侧上颌骨分别发生向中央裂隙区的旋转，导致裂隙变窄；上颌骨生长均受到抑制，其中宽度最严重，高度次之，长度最轻；上颌骨前段所受到的影响大于后段；牙槽突所受到的影响大于颌骨体。
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