Journal Article

Dentofacial effects of a modified tandem traction bow appliance

Zeynep Atalay and Tuba Tortop

in The European Journal of Orthodontics

Published on behalf of European Orthodontics Society

Volume 32, issue 6, pages 655-661
Published in print December 2010 | ISSN: 0141-5387
Published online March 2010 | e-ISSN: 1460-2210 | DOI:
Dentofacial effects of a modified tandem traction bow appliance

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The aim of this study was to evaluate the dentofacial effects of a modified tandem traction bow appliance (modified TTBA) in skeletal Class III subjects, and the effect of age on treatment response. The material consisted of the pre-treatment/pre-observation and post-treatment/post-observation lateral cephalograms and hand-wrist films of 45 children with skeletal and dental Class III malocclusions. Thirty patients were treated with a modified TTBA. Two treatment groups of 15 patients each were formed: an early (nine girls, six boys; mean skeletal age: 8.18 ± 0.50 years) and a late treatment (5 girls, 10 boys; mean skeletal age: 11.75 ± 1.00 years) group. The remaining 15 children (5 girls, 10 boys; mean skeletal age: 7.90 ± 0.62 years) were observed without treatment for 8 months and served as a control for the early treatment group. Wilcoxon and Mann–Whitney U-tests were used for statistical analysis.

Significant forward maxillary movement was determined in both treatment groups (P < 0.01) while the decrease in SNB was significantly greater in the early treatment group compared with the control (P < 0.01). Upper molar tipping and sagittal displacement of point A (point A-T, NFH-A) was found to be significantly greater in the late treatment group compared with the early treatment group (P < 0.05). In both treatment groups, dental and skeletal correction of the Class III malocclusion was achieved.

Journal Article.  3882 words.  Illustrated.

Subjects: Restorative Dentistry and Orthodontics

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