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Permanent link (DOI): https://doi.org/10.7939/R3S46HK8B

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Comparison of Deformation and Torque Expression of the Orthos and Orthos Ti Bracket Systems Open Access

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Author or creator
Melenka, Garrett W.
Lacoursiere, Ryan A.
Carey, Jason P.
Nobes, David S.
Heo, Giseon
Major, Paul W.
Additional contributors
Subject/Keyword
Deformation
Torque
Digital image correlation
Bracket
Archwire
Edgewise orthodontic treatment
Type of item
Journal Article (Published)
Language
English
Place
Time
Description
Orthodontic torque expression is the result of axial rotation of rectangular archwires within a rectangular bracket slot. This study investigates the effect of bracket material on torque expression. Torque exerted by a rotating archwire on each bracket will be measured as well as the relative deformation of each bracket slot. A total of 60 tests were performed where archwires were rotated within a bracket slot to produce torque within a bracket. Thirty Ormco Orthos Ti and 30 Orthos SS were compared to investigate the effect of torque on bracket material. Each bracket was mounted on a six-axis load cell that measured forces and moments in all directions. The archwire was rotated from an initial angle of 0 degree in 3 degrees increments to maximum angle of 51 degrees and then returned to the initial position. An overhead camera took images at each 3 degrees increment. The bracket images were post-processed using a digital image correlation technique to measure the relative deformation of each bracket slot. The maximum torque expressed at 51 degrees was 99.8 Nmm and 93.0 Nmm for Orthos Ti and Orthos SS, respectively. Total plastic deformation measured at 0 degrees post-torquing of the Orthos SS was 0.038 mm compared to 0.013 mm for Orthos Ti. The Orthos Ti brackets plastically deformed less than the Orthos SS brackets after torquing. The Orthos SS bracket plastic deformation was 2.8 times greater than that of Orthos Ti brackets. The Orthos Ti brackets expressed more torque than the stainless steel brackets but exhibited substantial variation.
Date created
2011
DOI
doi:10.7939/R3S46HK8B
License information
© 2011 Melenka, G.W., Lacoursiere, R.A., Carey, J.P., Nobes, D.S., Heo, G. & Major, P.W. This version of this article is open access and can be downloaded and shared. The original author(s) and source must be cited.
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Citation for previous publication
Melenka, Garrett W., Lacoursiere, Ryan A., Carey, Jason P., Nobes, David S., Heo, Giseon, & Major, Paul W. (2011). Comparison of Deformation and Torque Expression of the Orthos and Orthos Ti Bracket Systems. The European Journal of Orthodontics, 36(4), 381-388.  http://dx.doi.org/10.1093/ejo/cjr120

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File format: pdf (Portable Document Format)
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File size: 473081
Last modified: 2017:10:11 14:19:47-06:00
Filename: TEJoO_36_4_381.pdf
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File title: Deformation of the Orthos and Orthos Ti Bracket
File author: Garrett Melenka
Page count: 22
File language: en-CA
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