【摘要】 目的　模拟临床加载力系统 (M/F) ,研究加载与上中切牙移动类型之间的关系。方法　建立包括牙齿、牙周膜、硬骨板、松质骨、皮质骨的上中切牙三维有限元模型 ,采用 8节点、六面体单元 ,共包括 94 5个单元 ,12 4 5个节点 ,研究水平力为 1N时 13种不同加载力系统下的上中切牙位移方式。结果　加载力系统 (即M/F值 )不同 ,上中切牙的位移方式也不同。本研究显示了三种基本移动类型与加载之间的关系 :当M/F =- 9.15∶1时 ,牙齿以牙根尖点为中心转动 ,即可控的倾斜移动 ;当M/F =- 10 .3 0～ - 10 .5 0∶1时 ,牙齿做平行移动 ;当M/F =- 10 .90∶1时 ,牙齿以切缘为中心转动 ,即控根移动。结论　临床上为获得预计的牙齿移动类型 ,需采用不同的加载力系统更多还原

【Abstract】 Objective To investigate different types of tooth movement under different force systems by simulating clinical loading force systems.Methods Develop a three dimensional finite element model of upper central incisor, which consists of 945 isoparametric elements,1245 nodes. Analyse the types of tooth movement under different force system with a horizontal force of 1 N being applied at the upper central incisor.Results Different force systems (M/F) lead to different types of tooth movement . This study showed the relation between them. When M/F=-9.15∶1, it bringed the result of the controlled tipping movement; When M/F=-10.30～ -10.50∶1, it bringed the bodily movement; While M/F=-10.90∶1, it lead to the root movement.Conclusion This study suggested that it is necessary to adopt different loading force systems in order to obtain determined tooth movement.更多还原