华西口腔医学杂志

• 基础研究 • 上一篇    下一篇

推杆式矫治器前导下颌对颌骨应力和位移的影响

李丽华1  高翔2  宋锦璘2  邓锋2  李娜1   

  1. 1.川北医学院附属医院口腔科, 南充637000;2.重庆医科大学附属口腔医院北部院区正畸科, 重庆401147
  • 出版日期:2013-08-01 发布日期:2013-08-01
  • 通讯作者: 宋锦璘,Tel:023-88860105
  • 作者简介: 李丽华(1977—),女,四川人,讲师,硕士
  • 基金资助:

    重庆市教育委员会科学技术研究基金资助项目(kj060316);川北医学院苗圃基金资助项目(MP-ZK-43)

The impact of Forsus on mandible’s stress and displacement

Li Lihua1, Gao Xiang2, Song Jinlin2, Deng Feng2, Li Na1.   

  1. 1. Dept. of Stomatology, Affiliated Hospital of North Sichuan Medical College, Nanchong 637000, China; 2. Dept. of Orthodontics, North Branch, The Affiliated Hospital of Stomatology, Chongqing Medical University, Chongqing 401147, China
  • Online:2013-08-01 Published:2013-08-01

摘要:

 目的  分析推杆式矫治器(Forsus)在不同垂直向分力作用下瞬时前导下颌后下颌骨的应力和位移变化,为Forsus临床应用提供实验基础。方法  经Abaqus 6.5软件构建Forsus导下颌向前三维有限元模型,分别模拟Forsus矫治中水平向分力为4 N,垂直向分力分别为2、4、1 N的3种工况下下颌骨的应力、位移及路径变化。结果  3种工况下,下颌骨均出现较大应力,髁突发生扭转。垂直向分力为4 N时,下颌骨旋转幅度很小,颏部前伸位移只有0.188 mm;垂直向分力为2 N和1 N时,下颌颏部前伸位移分别为1.150 mm和2.141 mm,下颌骨发生前上旋转。结论  随着垂直向分力逐渐减小,颏部前伸位移趋势增大。Forsus前导下颌有利于颌骨生长改建。

关键词: 推杆式矫治器, 应力, 位移, 下颌骨旋转

Abstract:

 Objective  To further explore the best Forsus load power by analyzing the change of mandible’s stress and displacement after Forsus protruded mandible instantaneously under different vertical component for providing theoretical basis. Methods  The pre-built Forsus protruding mandible model were build through Abaqus 6.5 software. The change of mandible’s stress, displacement, and pathway trend under three different working conditions(horizontal component4 N and vertical component 2, 4, 1 N). Results  Torsion occurred in all condyles under three working conditions,and the stress was large. Under vertical component 2 and 1 N, the mandible demonstrated counterclockwise rotation,the maximum displacement occurred in the chin, respectively 1.150 mm and 2.141 mm; under vertical component 4 N, mandible rotation was not obvious, the maximum displacement of chin was only 0.188 mm. Conclusion With thevertical component gradually decreased, the protrusion trend of chin increased; Forsus could promote the mandible counterclockwise rotation and modification when protruding mandible.

Key words: Forsus, stress, displacement, mandible rotation