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The effect of perturbations on resistance to sliding in second-order moments comparing two different bracket types

  1. Justin K Wong1
  2. Dan L Romanyk2
  3. Roger W Toogood2
  4. Giseon Heo3
  5. Jason P Carey2
  6. Paul W Major3
  1. 1Department of Orthodontics, School of Dentistry, Faculty of Medicine & Dentistry, Edmonton Clinic Health Academy, University of Alberta, Edmonton, AB, Canada
  2. 2Department of Mechanical Engineering, University of Alberta, Edmonton, AB, Canada
  3. 3School of Dentistry, Faculty of Medicine & Dentistry, Edmonton Clinic Health Academy, University of Alberta, Edmonton, AB, Canada
  1. Paul W Major, School of Dentistry, Faculty of Medicine & Dentistry, 5478 Edmonton Clinic Health Academy, University of Alberta, 11405-87 Ave NW, Edmonton, AB T6G 1C9, Canada. Email: major{at}ualberta.ca

Abstract

Orthodontic literature has shown all ligation methods to behave similarly in the clinical situation; however, the reasoning behind this still requires further investigation. A novel frictional device able to measure forces at the level of the bracket along with a custom perturbation device was used to investigate the effect of perturbations on resistance to sliding (RS) using conventional and passive ligated brackets. 150 3M Victory Series twins (0.022 slot) and 150 Damon Q brackets (0.022 slot) were tested using an 0.018 x 0.025 stainless steel wire for RS. There were 5 test groups consisting of equal numbers (n=30) representing combinations of high and low amplitude and frequency of perturbations along with a control. Second order angulation tested ranged from 0 to 6 degrees. Results for conventional brackets in the presence of perturbations at 0 degrees showed there was a statistically significant reduction (P<0.001) in RS when compared to controls. At 6 degrees, this difference (P<0.001) was seen in both high perturbation groups and one of the low perturbation groups. For passive ligated brackets, no statistically significant difference between groups was seen at 0 degrees. However, at 6 degrees high perturbation groups both resulted in statistically significant (P<0.001) reductions in RS when compared to controls. From this study it was concluded that passive ligated brackets have a lower RS when compared to conventional ligated brackets under all test conditions and angulations. Also, amplitude of perturbations has a larger role than frequency in reduction of RS values.

Article Notes

  • Declaration of conflicting interests The authors declare that there is no conflict of interest.

  • Funding This research received no specific grant from any funding agency in the public, commercial, or not-for-profit sectors.

  • Received January 21, 2014.
  • Accepted September 29, 2014.

This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 3.0 License (http://www.creativecommons.org/licenses/by-nc/3.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access page (http://www.uk.sagepub.com/aboutus/openaccess.htm).

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This Article

  1. J Dent Biomech vol. 5 1758736014557500
  1. Free via Creative Commons: CC

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