Download the full-sized PDF
Permanent link (DOI): https://doi.org/10.7939/R3S46HK8B
This file is in the following communities:
|Mechanical Engineering, Department of|
This file is in the following collections:
|Journal Articles (Mechanical Engineering)|
Comparison of Deformation and Torque Expression of the Orthos and Orthos Ti Bracket Systems Open Access
- Author or creator
Melenka, Garrett W.
Lacoursiere, Ryan A.
Carey, Jason P.
Nobes, David S.
Major, Paul W.
- Additional contributors
Digital image correlation
Edgewise orthodontic treatment
- Type of item
- Journal Article (Published)
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
- 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.
- 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
- Link to related item
- Date Uploaded
- Date Modified
- Audit Status
- Audits have not yet been run on this file.
File format: pdf (Portable Document Format)
Mime type: application/pdf
File size: 473081
Last modified: 2017:10:11 14:19:47-06:00
Original checksum: 2796fb5f5c892a94f4f4dca28d720277
Well formed: true
File title: Deformation of the Orthos and Orthos Ti Bracket
File author: Garrett Melenka
Page count: 22
File language: en-CA