应用种植体支抗辅助上颌前方牵引颅颌面骨缝应力特征的三维有限元分析  

The characteristics of stress on craniofacial skeleton sutures under protraction by mini-plant:an analysis with three-dimensional finite element model

作　　者：罗晨[1] 冯雪[1] 汪金龙[2] 曾照斌[1] 

机构地区：[1]第四军医大学口腔医学院,陕西西安710032 [2]西安交通大学机械工程学院,陕西西安710049

出　　处：《牙体牙髓牙周病学杂志》2013年第4期252-255,265,共5页Chinese Journal of Conservative Dentistry

基　　金：陕西省科技计划项目(2012JM4036)

摘　　要：目的:建立种植体支抗辅助上颌前方牵引的三维有限元模型,分析在不同大小前方牵引力值作用下,颅面复合体骨缝的应力特征。方法:应用逆向工程方法建立种植体支抗进行上颌前方牵引的三维有限元模型,于上颌颧牙槽嵴处加载与牙合平面呈向下30°,300 g、500 g、800 g前方牵引力,分析各骨缝的应力特征。结果:不同大小前方牵引力在颅颌面各骨缝产生的应力大小不同,其应力由大到小依次为:翼腭缝>颧颞缝>鼻额-额颌缝>腭横缝>颧颌缝>颧额缝;随着力值增大,各骨缝应力均有所增加,应力变化趋势与应力分布情况相似;相同力值下,同一骨缝内应力分布也不均匀。结论:建立的颅上颌骨缝有限元模型生物相似性好,前牵力值在骨缝产生的应力能使上颌骨逆时针旋转并促进上颌发育。AIM： To investigate the biomechanical changes of craniofacial skeleton sutures during protrac- tion by mini-plant at different forces on the craniofacial complex. METHODS： A three-dimensional finite element model （3-D FEM） of cranio-maxillary complex of maxillary deficiency with mini-plant was established by reverse en- gineering technique. The different protraction forces from 300g to 800g were applied to labial surface of the maxillary infrazygomatic crest respectively at 30° to occlusal plane. Biomechanical changes in skeleton sutures were investigated by the analysis of 3 - D FEM. RESUTLS： With the protraction force increasing, the stress of different points in craniofacial skeleton sutures was increased. The stress intension was in sutura pterygopalatine 〉 sutura temporozygomat- ica 〉 sutura frontomaxillaris 〉 sutura palatina transversa 〉 sutura zygomaticomaxillaris 〉 frontozygomatic suture. Non-u- niform stress intension existed in the same skeleton suture under the same protraction force. CONCLUSION： A 3-D FEM of cranio-maxillary complex of maxillary deficiency with good biological similarity was developed. The stress on craniofacial skeleton sutures may cause maxillary counter-clockwise rotate and promote the development of maxillary.

关 键 词：前方牵引 三维有限元 种植体支抗 上颌发育不足 

分 类 号：R782.2[医药卫生—口腔医学]