应用唇舌弓式口内装置进行前方牵引的三维有限元分析

目的 分析在唇舌弓式前方牵引过程中与上颌骨生长密切相关的4条骨缝的生物学作用。方法 在建立了带有骨缝实体模型的颌面骨三维有限元模型的基础上，模拟唇舌弓式前方牵引装置进行三维有限元分析。结果 计算得到4条骨缝的位移分云图及应力分布情况。唇舌弓式前方牵引装置适合反伴深覆的骨性安氏Ⅲ类患者；额颌缝与颧颌缝对上颌骨的前移与逆时针旋转发挥了主要作用，颞颧缝与翼腭缝的变化不明显。结论 本文采用的颌面骨三维有限元模型能够有效模拟唇舌弓式口内装置在前方牵引中对骨缝产生的生物力学效应。

Three-dimensional finite-element analysis of maxillary protraction based on labiolingual appliance

Objective This study aims to analyze the biomechanical effects of four sutures that are related to maxillary growth during a maxillary protraction treatment cycle based on labiolingual appliance. Methods A three-dimensional simu-lation of labiolingual appliance was performed based on a three-dimensional finite-element maxillofacial model combined with solid-modeled sutures. Results The displacement and stress distributions were calculated. The labiolingual appliance was suitable for patients with underbites or deep overbites. Sutura frontomaxillaris and sutura zygomaticomaxillaris were vital to the forward displacement and counterclockwise rotation of the maxillary. The changes in sutura zygomaticotempo-ralis and sutura palatine were not significant. Conclusion The influences of the labiolingual appliance on the sutures during the treatment cycle of maxillary protraction can be effectively simulated by the three-dimensional finite-element maxillofa-cial model.