摘要
目的 探讨唇腭裂上颌复合体不同类型截骨块的抗力中心,以便为临床牵引截骨提供理论指导.方法 采用螺旋CT扫描与三维有限元方法相结合,建立唇腭裂上颌复合体LeFort Ⅰ、Ⅱ、Ⅲ型截骨骨块及相应软组织有限元模型,分别在5个不同垂直高度加载水平向力和4个不同水平距离加载垂直向力,力值均为9.8 N,根据骨块不同观察点位移情况确定不同截骨块的抗力中心.结果 唇腭裂上颌复合体LeFort Ⅱ型截骨骨块的抗力中心前后位置在尖牙与第1双尖牙后缘之间,高度为鼻底与梨状孔中点间.LeFort Ⅲ型截骨骨块的抗力中心前后位置在第1双尖牙后缘与第1磨牙后缘之间,高度为梨状孔中点与鼻前点间.结论 唇腭裂上颌复合体不同截骨块抗力中心的确定,为唇腭裂颅面复合体牵引成骨生物力学研究奠定了基础.
Objective To explore the location of the centre of resistance for the maxillary complex in cleft lip and palate by the use of finite element analysis. Methods Combining spiral CT scanning technology with the three-dimensional finite element method, a three-dimensional FEM model of LeFort Ⅰ , Ⅱ , and Ⅲ complex and soft tissue in cleft lip and palate was developed for analysis. Anteriorly and inferiorly directed forces of 9.8N were applied at five different levels parallel to the functional occlusal plane and four different levels perpendicular to the functional occlusal plane, respectively.For each loading condition, horizontal and vertical displacements of different anatomic points in the complex and on the maxillary dentition were analysed. Location of the centre of resistance in different osteotomy complex were studied. Results The resistant center of the LeFort Ⅱ complex in cleft lip and palate was located on intersection between basis nasi and medium of apertura piriforms vertically,apex of the canine and posterior point of the first bicuspid horizontally. The resistant center of the LeFort Ⅲ complex in cleft lip and palate was located on intersection between anterior of the nasion and medium of apertura piriforms vertically, posterior point of the first molar and first bicuspid horizontally. Conclusion Knowledge of the resistant center of different osteotomy complex could establish a basis for biomechanical studies of craniofacial complex distraction osteogenesis in cleft lip and palate.
出处
《中华医学美学美容杂志》
2010年第5期297-300,共4页
Chinese Journal of Medical Aesthetics and Cosmetology
基金
天津市卫生局科技基金资助项目（编号：06KY20）
关键词
唇腭裂
生物力学
抗力中心
上颌复合体
Cleft lip and palate
Biomechanics
Resistant center
Maxillary complex
