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The European Journal of Orthodontics Advance Access published online on February 22, 2006
The European Journal of Orthodontics, doi:10.1093/ejo/cji111
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© The Author 2006. Published by Oxford University Press on behalf of the European Orthodontics Society. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org.

Article

Post-treatment development of the curve of Spee

Ferdinand Lie 1, Reinder Kuitert 1, and Andrej Zentner 1 *

1 Department of Orthodontics, Academic Centre for Dentistry, Amsterdam, The Netherlands

* To whom correspondence should be addressed.
Andrej Zentner, E-mail: AZentner{at}acta.nl


  Abstract

The aim of this study was to investigate the post-treatment development of the curve of Spee (CS) and to predict its post-treatment stability on the basis of cephalometric parameters. Lateral cephalograms and study models of 135 subjects (50 males and 85 females) were taken before orthodontic treatment (T1; 12.0 ± 1.5 years), at the end of orthodontic treatment (T2; 14.6 ± 1.5 years), and at least 3 years out of retention (T3; 26.6 ± 5.0 years); the curve depth (CD), location of the deepest point (LDP) of the curve, and eight cephalometric parameters were assessed. The sample was divided into a treated and an untreated lower arch group. The upper arch was treated in all patients. The sample consisted of 25 per cent Class I, 73 per cent Class II, and 2 per cent Class-III-treated malocclusions.

The results showed that the post-treatment CD was frequently unstable and unexpected changes were relatively common. The LDP was displaced distally during T1-T2 and showed mesial relocation during T2-T3. Assessment of potential predictors of the post-treatment changes in CD and LDP using stepwise regression analysis showed that a deep curve at T2 was associated with a decrease of the CD during T2-T3. A combination of distal location of the LDP with proclination of the lower incisors at T2 and extraction treatment was associated with mesial relocation of the LDP during T2-T3. The results also suggest that an optimal CD of about 2.0 mm at T2 was associated with the least amount of post-treatment change.


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