Asymmetric Loop forms in anterior retraction arch wire
Publish place: Iranian Journal of Orthodontics، Vol: 4، Issue: 1
Publish Year: 1388
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_ORTHO-4-1_004
تاریخ نمایه سازی: 25 بهمن 1400
Abstract:
Aim: The aim of this study was to assess the effects of different loop forms in continuous arch technique on its force characteristics in the anterior retraction arch wires.Material and Method: Six ۳D finite element models were designed of an anterior retraction arch wire formed and included four average sized anterior brackets and the palatal wall of the bracket slot of the canines. The models were similar except for the height and angle of the loop legs. The left side loop was kept constant in all stages of the study while modifying the right side loop height or vertical leg's angulations. SolidWorks ۲۰۰۶ was selected for the modeling phase and ANSYS Workbench Ver. ۱۱.۰ for the calculations. Mesializing force on molar, medially directed force on canine, and anterior retraction forces were evaluated.Results: According to the results, loop height in one side cannot affect the other side loop force characteristic directly; A gradual increase of the force difference between two side of the anterior retraction arch wire is shown. The mesializing force on molar is also increased with almost the same manner. The other findings related to loop leg divergence shows a difference between two sides but the differences are almost the same with varying degrees of divergence. Although the forces are not the same in both sides but the difference remained almost constant. Conclusion: Arch wires may seem to be symmetric but may act asymmetric. Difference in anterior teeth retraction may be due to some asymmetries in arch wire fabrication which needs further considerations.
Keywords:
Authors
Allahyar Geramy
Professor Dental Research Center and Orthodontics Department Tehran University of Medical Sciecnes
Reza Jelodar
Assistant Professor, Babol, University of Medical Sciences
Hasan Salehi
Orthodontist