上颌前牵引联合腭部扩弓的三维有限元生物力学研究

目的：探讨上颌前牵引过程中，模拟腭部扩弓对上颌骨的位移变化的影响规律，为临床上唇腭裂患者的正畸治疗提供理论依据。方法：在自主探索建立的唇腭裂上颌骨三维有限元模型的基础上，利用ANSYS 10.0软件模拟上颌前牵引和上颌扩弓，分析比较前牵引力作用下上颌骨的位移变化。结果：模拟前牵引加腭部扩弓治疗，上颌骨发生向前、向下、向外的增长。有扩弓治疗的水平位移值明显减小。健侧和患侧牙弓均未出现牙弓内缩的变化。结论：上颌前牵引联合应用腭部扩弓治疗唇腭裂患者，有利于全面改善上颌骨的发育。

Biomechanical study on 3-dimensional finite element model of maxillary protraction and the palate expansion

ObjectiveTo determine the rule of simulated protraction and palate expansion on shift of maxillary bone，and to supply the scientific data for treating maxilla in patients with cleft lip and palate.MethodsBased on the establishment of 3-dimensional finite element model of maxilla with cleft lip and palate，we used ANSYS 10.0 software to simulate protraction and expand fissures of palate，and analyzed the changes of maxillary shift.ResultsAfter the simulated protraction and pa-late expansion，an upward, forward, and outward growth occurred on maxilla, and the normal lateral bow had no internal shrinkage as well as the abnormal one.ConclusionCombined palate expansion with maxillary protraction treatment in patients with cleft lip and palate tend to improve the development of maxillary bone.