Journal Article

Effects of intrusion combined with anterior retraction on apical root resorption

Décio Rodrigues Martins, Douglas Tibola, Guilherme Janson and Fábio Rogério Torres Maria

in The European Journal of Orthodontics

Published on behalf of European Orthodontics Society

Volume 34, issue 2, pages 170-175
Published in print April 2012 | ISSN: 0141-5387
Published online March 2011 | e-ISSN: 1460-2210 | DOI:
Effects of intrusion combined with anterior retraction on apical root resorption

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This study evaluated the influence of intrusion mechanics combined with anterior retraction on root resorption of the maxillary incisors. A sample of 56 patients was divided into two groups: group 1 comprised 28 patients (12 females and 16 males), presenting with an increased overjet and deep overbite (6.48 and 4.78 mm, respectively) treated with reverse curve of Spee intrusion mechanics and group 2 comprised 28 patients (12 females and 16 males) with an increased overjet of 5.67 mm and a normal overbite of 1.12 mm. The initial mean ages for groups 1 and 2 were 13.41 and 13.27 years, respectively. Pre- (T1) and post- (T2) treatment periapical radiographs were used to evaluate root resorption. The groups were compared using the Mann–Whitney U-test. Correlation between root resorption and tooth movement was investigated with Spearman’s correlation coefficient.

The subjects in group 1 had statistically greater root resorption (P < 0.05) than those in group 2. The initial overbite severity and the amount of correction had significant positive correlations with root resorption (r = 0.324 and r = 0.320, respectively). The combination of anterior retraction with intrusive mechanics causes more root resorption than anterior retraction of the maxillary incisors alone.

Journal Article.  3789 words.  Illustrated.

Subjects: Restorative Dentistry and Orthodontics

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