正畸托槽粘接应力的三维有限元研究  

Evaluation of the bonding stress of orthodontic bracket using three dimensional finite element method

作　　者：杨亚囡[1] 李洪发[1] 房伯君[2] 

机构地区：[1]天津医科大学口腔医院正畸科,天津300070 [2]中国医科大学第二临床医院

出　　处：《天津医科大学学报》2010年第1期123-126,共4页Journal of Tianjin Medical University

摘　　要：目的:应用三维有限元法比较三种去粘接方法的优缺点。方法:建立牙-粘接剂-托槽系统的三维有限元模型,比较相同大小的剪切力、拉力和扭转力作用下,系统各部分的应力分布情况。结果:三种加载模式下,不同界面的应力和位移分布都是不均匀的;拉力加载条件下托槽/粘接剂界面的Von-Mises应力和最大主应力最大;剪切力加载条件下釉质/粘接剂界面的Von-Mises应力、最大主应力和位移变化最大。结论:单一加载条件下,拉力更容易产生界面的粘接破坏;剪切力加载条件下的应力和位移改变较大是其易引起釉面裂纹的原因之一。Objective： To compare the stress and displacement changing used by in vitro bonding strength test. Methods： The three dimensional finite adhesive-bracket system was built and the shear, tensile and torsion with the the corresponding location. The stress distribution and displacement changing of three debonding methods element model of the tooth- same Newton were loaded at of different loads in different interface were analyzed and measured. Results： Under the three different loads, neither the stress nor the displacement changing was uniform; The Von-Mises stress, the max principal stress and displacement of bracket/adhesive interface were larger than that of the enamel/adhesive interface. The Von-Mises stress and the max principal stress of the bracket/adhesive interface under tensile load was the largest among the three loads. Conclusion： In the single load cases, tensile load leads to interface failure easily; The largest changes of stress and displacement during shear load maybe one of the reasons that lead to enamel cracking.

关 键 词：有限元分析 正畸托槽 去粘接 

分 类 号：R783[医药卫生—口腔医学]