A newly designed loop for en-masse anterior retraction - a finite element study

IF 0.5 Q4 DENTISTRY, ORAL SURGERY & MEDICINE

Orthodontic Waves Pub Date : 2021-07-03 DOI:10.1080/13440241.2021.1958614

Arathi Murugesan, N. R

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引用次数: 1

Abstract

ABSTRACT Objective : The present study was aimed to analyse the efficacy of specs loop, a newly designed closing loop. Materials and Methods : A finite element maxillary model for en-masse anterior retraction was made. The newly designed specs loop was tested with different preactivation bends (alpha-30 degree; beta-15 degree, 30 degree and 45 degree) and without preactivation bends. The horizontal and vertical forces and moments at both the alpha and beta nodes and overall moment to force ratio, range of crown tip, root tip and vertical movement of all the individual teeth, stress acting on the teeth and bone were calculated for each group for a horizontal activation of 3 mm using Abaqus software. Results : Stress acting on the teeth and bone decreased with increasing beta bend. Moment-to-force (M/F) ratio acting on the anterior teeth was approximately 10:1 with preactivation bends of alpha 30 degrees and beta degrees 15, 30 and 45 degrees whereas the M/F ratio was only 2:1 without the preactivation bends. With increasing beta bend, distal crown tip of the teeth and the extrusive movement of the posteriors increased while the extrusive movements of the anterior decreased. Conclusion : The specs loop with preactivation bends can be efficiently used for en-masse anterior retraction.

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一种新设计的用于大规模前缩的环-有限元研究

摘要目的：本研究旨在分析一种新设计的闭合环路specs环路的疗效。材料与方法：建立了上颌整体前缩的有限元模型。新设计的规格回路在不同的预激活弯曲（α-30度；β-15度、30度和45度）和没有预激活弯曲的情况下进行了测试。使用Abaqus软件计算每组水平激活3mm时，α和β节点处的水平和垂直力和力矩，以及整体力矩与力的比值、所有单个牙齿的冠尖、根尖和垂直运动范围、作用在牙齿和骨骼上的应力。结果：作用在牙齿和骨骼上的应力随着β弯曲度的增加而减小。作用在前牙上的力矩-力（M/F）比约为10:1，预激活弯曲度为α30度，β15度、30度和45度，而在没有预激活弯曲的情况下，M/F比仅为2:1。随着β弯曲的增加，牙齿的远侧牙冠尖端和后部的挤出运动增加，而前部的挤出运动减少。结论：带预激活弯曲的specs环可以有效地用于集体前回缩。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Orthodontic Waves DENTISTRY, ORAL SURGERY & MEDICINE-

CiteScore

0.40

自引率

0.00%

发文量

期刊介绍： Orthodontic Waves is the official publication of the Japanese Orthodontic Society. The aim of this journal is to foster the advancement of orthodontic research and practice. The journal seeks to publish original articles (i) definitive reports of wide interest to the orthodontic community, (ii) Case Reports and (iii) Short Communications. Research papers stand on the scientific basis of orthodontics. Clinical topics covered include all techniques and approaches to treatment planning. All submissions are subject to peer review.