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2
A comparison of mechanical characteristics of four common orthodontic loops in different ranges of activation and angular bends: The concordance between experiment and finite element analysis.四种常见正畸曲在不同激活范围和角度弯曲下的力学特性比较：实验与有限元分析的一致性
Int Orthod. 2018 Mar;16(1):42-59. doi: 10.1016/j.ortho.2018.01.011. Epub 2018 Feb 22.
3
Effect of activation and preactivation on the mechanical behavior and neutral position of stainless steel and beta-titanium T-loops.激活和预激活对不锈钢及β钛T形曲的力学行为和中性位置的影响
Korean J Orthod. 2015 Jul;45(4):198-208. doi: 10.4041/kjod.2015.45.4.198. Epub 2015 Jul 24.
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舌侧正畸中不同预激活曲度的T形曲的比较评估——一项有限元研究

Comparative evaluation of T-Loop with different amount of pre-activation curvatures in lingual orthodontics- A finite element study.

作者信息

Girsa Pooja, Singh Ashish Kumar, Kannan Sridhar, Arora Nitin, Malhotra Abhita

机构信息

Department of Orthodontics and Dentofacial Orthopaedics, Manav Rachna Dental College, Faridabad, Haryana, India.

出版信息

J Oral Biol Craniofac Res. 2021 Apr-Jun;11(2):118-122. doi: 10.1016/j.jobcr.2021.01.003. Epub 2021 Jan 7.

DOI:10.1016/j.jobcr.2021.01.003
PMID:33532197
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7829266/
Abstract

INTRODUCTION

Three-dimensional analysis of the moment, force and M/F ratio generated at the anterior and posterior region of the T-loop in five different groups of pre-activation curvatures using the finite element method.

MATERIALS AND METHOD

In this study, the geometric model of maxilla was constructed using a CBCT scan. The bracket system simulated was of the STb lingual bracket system from Ormco (0.18slot) with specified tip and torque values of all maxillary teeth and the arch wire used was 0.016″x 0.016″ TMA (Ormco) for fabrication of T-loop with dimensions of 6 ​× ​2 ​× ​7 ​mm. There were five different models generated with pre-activation of: 20°,30°,40°,50° and 60° in T-loop. The software used for the post-processing of the model was ANSYS Workbench 19.2.

RESULT

When the amount of pre-activation of T-loop increased there was an increase in the moment, force and M/F ratio in all the five groups in lingual biomechanics.

CONCLUSION

Although, the M/F ratio depicts the type of movement that will take place is uncontrolled tipping in all the five pre-activation groups, clinically we should give pre-activation ranging from 30° to 60° in T-loop in lingual orthodontics.

摘要

引言

使用有限元方法对五组不同预激活曲度的T形曲前后区域产生的力矩、力和M/F比进行三维分析。

材料与方法

在本研究中，使用锥形束计算机断层扫描（CBCT）构建上颌骨的几何模型。模拟的托槽系统为奥美科（Ormco）的STb舌侧托槽系统（0.18英寸槽沟），所有上颌牙齿具有特定的倾斜和转矩值，所使用的弓丝为0.016英寸×0.016英寸的TMA（奥美科），用于制作尺寸为6×2×7毫米的T形曲。生成了五个不同的模型，T形曲预激活角度分别为：20°、30°、40°、50°和60°。用于模型后处理的软件为ANSYS Workbench 19.2。

结果

当T形曲的预激活量增加时，舌侧生物力学中所有五组的力矩、力和M/F比均增加。

结论

尽管M/F比表明在所有五个预激活组中发生的运动类型是不受控制的倾斜，但在临床舌侧正畸中，我们应在T形曲中给予30°至60°的预激活。