Journal Article

Three-dimensional analysis of orthodontic tooth movement based on <i>XYZ</i> and finite helical axis systems

Kazuo Hayashi, Jun Uechi, Seung-Pyo Lee and Itaru Mizoguchi

in The European Journal of Orthodontics

Published on behalf of European Orthodontics Society

Volume 29, issue 6, pages 589-595
Published in print December 2007 | ISSN: 0141-5387
Published online October 2007 | e-ISSN: 1460-2210 | DOI: http://dx.doi.org/10.1093/ejo/cjm061
Three-dimensional analysis of orthodontic tooth movement based on XYZ and finite helical axis systems

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The purpose of this study was to demonstrate the advantage of the finite helical axis (FHA) system in the biomechanical analysis of orthodontic tooth movement by comparing it with the rectangular coordinate (XYZ) system.

Ten patients (6 females and 4 males, mean age 23 years 7 months) were selected. Maxillary canine retraction using light continuous forces of two different magnitudes (0.5 and 1 N) was used to retract the right and left maxillary canines in subjects who required maximum posterior anchorage. The findings were compared based on midpalatal implants that provided a fixed reference for measurement. The significance of the difference between the results with the two different force magnitudes was determined using Wilcoxon's signed-rank test.

With both the XYZ and the FHA system, no significant differences in the amount of distal movement of the canines over 2 months were found between the two force magnitudes. However, the results showed that the canine was likely to incline distally during tooth retraction with a force of 1 N compared with a force of 0.5 N (P < 0.05). With the FHA system, the result indicated that the canine was likely to incline palatally during tooth retraction with a force of 0.5 N compared with a force of 1 N (P < 0.05).

In this study, the combination of these two different approaches for describing tooth movement clearly showed a difference between light continuous forces of 0.5 and 1 N.

Journal Article.  4486 words.  Illustrated.

Subjects: Restorative Dentistry and Orthodontics

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