Document Detail

Torque capabilities of self-ligating and conventional brackets under the effect of bracket width and free wire length.
MedLine Citation:
PMID:  23020696     Owner:  NLM     Status:  In-Data-Review    
Huang Y., Keilig L., Rahimi A., Reimann S., Bourauel C: Torque capabilities of self-ligating and conventional brackets under the effect of bracket width and free wire length Orthod Craniofac Res 2012;15:255-262. © John Wiley & Sons A/S STRUCTURED ABSTRACT: Objectives -  To numerically investigate the torque capacity of conventional and self-ligating brackets under the effect of varying bracket width and free wire length. Material and Methods -  Finite element models of three kinds of orthodontic brackets in the 0.022-inch slot size were investigated: Discovery, Damon 3MX, Speed. Additionally, finite element (FE) models of Speed and Damon brackets were generated with the same width as the Discovery. From the left upper incisor to the right upper canine, four brackets each were modelled. The total wire length at the upper right incisor was kept constant at 12 mm for all brackets types. For the Discovery brackets, the wire length was increased from 12 to 16 mm in 2-mm steps. A torque of 20° was applied to the upper right incisor with 0.46 × 0.64 mm(2) (0.018″ × 0.025″) and 0.48 × 0.64 mm(2) (0.019″ × 0.025″) wires. Wires made of stainless steel, titanium molybdenum and nickel titanium were studied. Torque angle/moment characteristics were recorded. Results -  Wider brackets showed more torque control capability (e.g. Discovery: 10.6 Nmm, Damon: 9.2 Nmm, Speed: 4.0 Nmm for the NiTi wire). Even with the same width as the Discovery bracket, Damon and Speed brackets showed lower torque capability than the Discovery bracket. Increasing the free wire length decreased the torsional stiffness of the wire and thus decreased the torque capability. Conclusion -  The results showed that the bracket design has less influence on the torquing moment than other parameters, such as bracket width, free wire length, wire/slot play or misalignment.
Y Huang; L Keilig; A Rahimi; S Reimann; C Bourauel
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Publication Detail:
Type:  Journal Article     Date:  2012-08-27
Journal Detail:
Title:  Orthodontics & craniofacial research     Volume:  15     ISSN:  1601-6343     ISO Abbreviation:  Orthod Craniofac Res     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-10-01     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101144387     Medline TA:  Orthod Craniofac Res     Country:  England    
Other Details:
Languages:  eng     Pagination:  255-62     Citation Subset:  D; IM    
Copyright Information:
© 2012 John Wiley & Sons A/S.
Y. Huang, Department of Orthodontics, Hospital of stomatology, Luzhou Medical College, Luzhou, China Y. Huang, L. Keilig, A. Rahimi, C. Bourauel, Oral Technology, School of Dentistry, University of Bonn, Bonn, Germany L. Keilig, S. Reimann, Department of Prosthetic Dentistry, Preclinical Education and Materials Science, School of Dentistry, University of Bonn, Bonn, Germany S. Reimann, Department of Orthodontics, School of Dentistry, University of Bonn, Bonn, Germany.
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