Torque expression and bracket deformation of the Orthos and OrthosTi orthodontic bracket

  • Author / Creator
    Lacoursiere, Ryan A.
  • Deformation of the orthodontic bracket upon wire engagement may result in torque dissipation within the bracket rather than transmission to the tooth and its supporting structures. The purpose of this study was: 1) quantify the amount of torque expression and 2) quantify any deformation as a result of such increasing torque expression. Digital image correlation is an accurate means of analyzing an orthodontic bracket's structural response to an applied moment of force created through archwire rotation in vitro. A sample of 30 Orthos and 30 OrthosTi brackets were tested with custom software using a novel application of digital image correlation. OrthosTi brackets produce significantly greater amounts of torque from 48° to 24° returning to a neutral position. Titanium brackets exhibit greater variance in torque expression but less variance in deformation. Orthos stainless steel brackets exhibit significantly greater amounts of bracket slot deformation in comparison to the OrthosTi.

  • Subjects / Keywords
  • Graduation date
  • Type of Item
  • Degree
    Master of Science
  • DOI
  • License
    This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.
  • Language
  • Institution
    University of Alberta
  • Degree level
  • Department
    • Department of Dentistry
  • Supervisor / co-supervisor and their department(s)
    • Dr. Jason Carey (Mechanical Engineering)
    • Dr. Paul W. Major (Dentistry)
    • Dr. Giseon Heo (Dentistry)
    • Dr. David Nobes (Mechanical Engineering)
  • Examining committee members and their departments
    • Dr. Jason Carey (Mechanical Engineering)
    • Dr. Paul W. Major (Dentistry)
    • Dr. Giseon Heo (Dentistry)
    • Dr. David Nobes (Mechanical Engineering