Tanne K, Sakuda M
Department of Orthodontics, Osaka University Faculty of Dentistry, Japan.
Angle Orthod. 1991 Summer;61(2):145-52. doi: 10.1043/0003-3219(1991)061<0145:BACCOT>2.0.CO;2.
The present study was designed to investigate biomechanical and clinical changes in the craniofacial complex resulting from orthopedic maxillary protraction by means of finite element and cephalometric analyses, respectively. An analytical model developed from a young human dry skull was used for finite element analysis. Three principal stresses were determined in the complex and its sutures. For evaluating morphological changes of patients, lateral cephalograms taken before and after maxillary protraction therapy were analyzed. Tensile stresses were produced in the maxillary and zygomatic bones in an anterior direction with corresponding compressive stresses in a perpendicular direction. In the sutural systems, compressive stresses were induced by counter-clockwise rotation of the complex. Cephalometric investigation demonstrated that significant improvement of the maxillo-mandibular relationship was obtained by maxillary protraction, however, maxillary growth and repositioning were not as great when compared to mean growth in the control group.
本研究旨在分别通过有限元分析和头影测量分析，研究上颌骨矫形前牵引导致的颅面复合体的生物力学和临床变化。从一个年轻人类干燥颅骨开发的分析模型用于有限元分析。确定了复合体及其缝线中的三个主应力。为了评估患者的形态变化，分析了上颌骨前牵引治疗前后拍摄的侧位头影图。上颌骨和颧骨向前产生拉伸应力，垂直方向产生相应的压缩应力。在缝合系统中，复合体的逆时针旋转会产生压缩应力。头影测量研究表明，上颌骨前牵引可显著改善上颌-下颌关系，然而，与对照组的平均生长相比，上颌骨的生长和重新定位并不显著。
