Thomas R Katona1, Serkis C Isikbay, Jie Chen. 1. a Associate Professor, Department of Orthodontics and Oral Facial Genetics, Indiana University School of Dentistry, and Department of Mechanical Engineering, Purdue University School of Engineering and Technology, Indianapolis, Ind.
Abstract
OBJECTIVE: To present and demonstrate a pseudo three-dimensional (3D) analytical approach for the characterization of orthodontic load (force and moment) systems. MATERIALS AND METHODS: Previously measured 3D load systems were evaluated and compared using the traditional two-dimensional (2D) plane approach and the newly proposed vector method. RESULTS: Although both methods demonstrated that the loop designs were not ideal for translatory space closure, they did so for entirely different and conflicting reasons. CONCLUSIONS: The traditional 2D approach to the analysis of 3D load systems is flawed, but the established 2D orthodontic concepts can be substantially preserved and adapted to 3D with the use of a modified coordinate system that is aligned with the desired tooth translation.
OBJECTIVE: To present and demonstrate a pseudo three-dimensional (3D) analytical approach for the characterization of orthodontic load (force and moment) systems. MATERIALS AND METHODS: Previously measured 3D load systems were evaluated and compared using the traditional two-dimensional (2D) plane approach and the newly proposed vector method. RESULTS: Although both methods demonstrated that the loop designs were not ideal for translatory space closure, they did so for entirely different and conflicting reasons. CONCLUSIONS: The traditional 2D approach to the analysis of 3D load systems is flawed, but the established 2D orthodontic concepts can be substantially preserved and adapted to 3D with the use of a modified coordinate system that is aligned with the desired tooth translation.
Entities:
Keywords:
Biomechanics; Moment-to-force ratio; Orthodontic force systems; T-loop archwire; Three-dimensional
Authors: Hisham M Badawi; Roger W Toogood; Jason P R Carey; Giseon Heo; Paul W Major Journal: Am J Orthod Dentofacial Orthop Date: 2009-10 Impact factor: 2.650