| M/F ratios of four different closing loops: 3D analysis using the finite element method (FEM). | |
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MedLine Citation:
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PMID: 17203575 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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BACKGROUND: It has been claimed that the opus loop is capable of delivering a constant and optimum M/F ratio without the need for gable bends. OBJECTIVE: To compare the forces, moments and moment/force (M/F) ratios of the opus loop, L-loop, T-loop and vertical helical closing loop (VHC loop) in a segmented arch with the finite element method (FEM). METHODS: The FEM was used to compare 3D models of closing loops in rectangular (0.016 x 0.022 inch) stainless steel wire. The L-, T- and VHC loops were designed with and without preactivation bends. The opus loop had no preactivation bends. The T-Loops were 10 mm in height and 10 mm in length. The horizontal and vertical forces, the moments and the M/F ratios at the alpha and beta ends were recorded at 0, 0. 1, 0.4, 0.7 and 1 mm intervals. RESULTS: The highest horizontal and vertical forces were produced by the L-loop (with and without preactivation bends) and in most cases the lowest forces were produced by the VHC loop. Loops with preactivation bends produced marked changes in the M/F ratio and loops without preactivation bends low, but relatively constant, M/F ratios over the full range of activation. Of the loops modelled without preactivation bends the opus and T-loop had the highest M/F ratios (7.20 - 7.67 mm at the anterior ends). CONCLUSION: Stainless steel opus and T-loops without preactivation bends had constant M/F ratios, but both loops failed to deliver the optimum M/F ratio of 10:1. |
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Authors:
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Mohammad Reza Safavi; Allahyar Geramy; Amir Kamyar Khezri |
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Publication Detail:
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Type: Comparative Study; Journal Article |
Journal Detail:
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Title: Australian orthodontic journal Volume: 22 ISSN: 0587-3908 ISO Abbreviation: Aust Orthod J Publication Date: 2006 Nov |
Date Detail:
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Created Date: 2007-01-05 Completed Date: 2007-03-01 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 1260462 Medline TA: Aust Orthod J Country: Australia |
Other Details:
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Languages: eng Pagination: 121-6 Citation Subset: D |
Affiliation:
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Shahid Beheshti University of Medical Sciences. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Biomechanics Computer Simulation Dental Alloys Finite Element Analysis* Humans Imaging, Three-Dimensional* Models, Biological Orthodontic Appliance Design* Orthodontic Wires* Stainless Steel Stress, Mechanical Surface Properties |
| Chemical | |
Reg. No./Substance:
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0/Dental Alloys; 12597-68-1/Stainless Steel |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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