三维有限元模型分析不同牙齿托槽底板结构对粘接强度的影响

Different bottom structure of dental brackets affect the adhesiveness ——Three dimensional finite-element analysis

关键词:  正畸托槽  三维有限元  底板结构  粘接强度

Key words:  dental bracket  three-dimensional finite element  bottom structure  bond strength

摘要:

[目的] 建立不同底板结构的牙齿托槽的三维有限元模型，分析不同托槽底板结构对粘接质量的影响。[方法]依据标准方丝弓托槽的尺寸，建立牙－粘接剂－托槽系统不同托槽底板的三维有限元模型。在模型上分别施加同样大小的三种外力，分析底板的应力分布和形变情况。[结果]（1）剪切力作用下托槽的抗破坏力最强，扭转力最易产生界面的粘接破坏。（2）拉力作用下托槽的抗形变能力最强，扭转力作用下托槽的抗形变能力最差。（3）设计的三角形网底托槽的固位能力相对较好，菱形网底托槽相对较差。[结论]综合底板应力分布和形变情况，设计的三角形网底托槽的粘接效果相对较好，而菱形网底托槽的固位能力相对较差。

Abstract:

[Objective] The aim of the study is to establish different bottom structures of dental brackets model in FEM(finite element analysis), and analyze the affect of different bottom structures on bond strength of dental brackets to enamel. [Methods] In the light of the size of standard edgewise brackets, tooth-cement-bracket models with different bottom structure were built on the computer and were loaded three types of force respectively. The stress and deformation distribution were analyzed. [Results] （1）The brackets generally show the best anti-destructibility under the shearing force, worst under the twisting force. （2）The brackets generally show the best anti-deformation under the tension, worst under the twisting force. （3）The triangle gridding bottom structure bracket we designed shows the relatively better retention capacity, and rhombus gridding one is just the reverse.[Conclusion] According to the force distribution and the deformation on the bottom structure, we conclude the triangle gridding bottom structure bracket we designed has relatively better retention capacity, and rhombus gridding one has poor retention capacity.