Mechanical testing and finite element analysis of orthodontic teardrop loop
Mechanical testing and finite element analysis of orthodontic teardrop loop
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DOI：
10.1016/j.ajodo.2007.07.017
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发表时间：
2008-02-01
影响因子：
3
通讯作者：
Coelho, Paulo Guilherme
中科院分区：
文献类型：
--
作者：
Coimbra, Maria Elisa Rodrigues;Penedo, Norman Duque;Coelho, Paulo Guilherme
简介：了解牙齿如何响应机械载荷而移动是正畸治疗的一个重要方面。治疗计划应包括考虑能够满足牙齿所需负荷的矫治器，以实现最佳治疗结果。本研究的目的是评估使用计算机模拟来预测激活 3 个高度的泪珠环后获得的力和扭矩。方法：75 个回缩环根据高度（6、7 和 8 毫米）分为 3 组。通过 0.5、1.0、1.5 和 2.0 毫米的位移，使环承受拉伸载荷，并记录产生的力和扭矩。回路在 AutoCAD 软件（2005 年；Autodesk Systems，Alpharetta，Ga）中设计，并使用 Ansys 软件（版本 7.0；Swanson Analysis System，Canonsburg，PA）进行有限元分析。通过ANOVA和Tukey事后检验对力学实验结果进行统计分析（P<01）。采用相关性检验和配对t检验（P<05）对计算机模拟与力学实验进行比较。结果和结论：计算机模拟准确地预测了实验确定的不同高度泪珠环的机械行为，应被视为治疗前设计正畸矫治器的替代方案。
Introduction: Understanding how teeth move in response to mechanical loads is an important aspect of orthodontic treatment. Treatment planning should include consideration of the appliances that will meet the desired loading of the teeth to result in optimized treatment outcomes. The purpose of this study was to evaluate the use of computer simulation to predict the force and the torsion obtained after the activation of teardrop loops of 3 heights. Methods: Seventy-five retraction loops were divided into 3 groups according to height (6, 7, and 8 mm). The loops were subjected to tensile load through displacements of 0.5, 1.0, 1.5, and 2.0 mm, and the resulting forces and torques were recorded. The loops were designed in AutoCAD software (2005; Autodesk Systems, Alpharetta, Ga), and finite element analysis was performed with Ansys software (version 7.0; Swanson Analysis System, Canonsburg, Pa). Statistical analysis of the mechanical experiment results was obtained by ANOVA and the Tukey post-hoc test (P < 01). The correlation test and the paired t test (P < 05) were used to compare the computer simulation with the mechanical experiment. Results and Conclusions: The computer simulation accurately predicted the experimentally determined mechanical behavior of teardrop loops of different heights and should be considered an alternative for designing orthodontic appliances before treatment.