Journal Article

Evaluation of apical root resorption following extraction therapy in subjects with class I and class II malocclusions

T Taner, S Ciger and Y Sençift

in The European Journal of Orthodontics

Published on behalf of European Orthodontics Society

Volume 21, issue 5, pages 491-496
Published in print October 1999 | ISSN: 0141-5387
Published online October 1999 | e-ISSN: 1460-2210 | DOI: http://dx.doi.org/10.1093/ejo/21.5.491
Evaluation of apical root resorption following extraction therapy in subjects with class I and class II malocclusions

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The purpose of this study was to determine the amount of root resorption during orthodontic treatment, and to examine the relationship between tooth movement and apical root resorption.

Twenty-seven Class I and 27 Class II patients treated with edgewise mechanics following first premolar extractions were selected. The following measurement were made on the pre- and post-treatment cephalograms: upper central incisor to palatal plane distance, the inclination of upper central incisor to the FH and AP planes, the perpendicular distances from the incisor tip to the AP and PTV planes, and incisor apex to PTV. The amount of apical root resorption of the maxillary central incisor was determined for each patient by subtracting the post-treatment tooth length from the pre-treatment tooth length measured directly on cephalograms. Intra-group differences were evaluated by the Student's t-test and inter-group differences by the Mann-Whitney U-test. For correlations the Pearson correlation coefficient was used.

The results show that there was a mean of approximately 1 mm (P<0.01) of apical root shortening in Class I patients, but in Class II division I subjects the mean root resorption was more than 2 mm (P<0.001). The inter-group differences were statistically significant. No significant correlations were found between the amount of apical root resorption and tooth inclination, or the duration of active treatment.

Journal Article.  0 words. 

Subjects: Restorative Dentistry and Orthodontics

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