V17N03 | 2012 | Original Article | Pages 132 to 137
Claudia Trindade Mattos, Mariana Marquezan, Isa Beatriz Barroso Magno Chaves, Diogo Gonçalves Dos Santos Martins, Lincoln Issamu Nojima, Matilde Da Cunha Gonçalves Nojima
Class I Angle malocclusion, Dental extraction, Dental esthetics, Facial profile,
Objective: To evaluate cephalometric changes in tooth and profile position in young adolescent individuals with Class I biprotrusion submitted to orthodontic treatment with extractions of four first premolars. Methods: Pre and post-treatment lateral cephalometric radiographs from 20 patients with Class I biprotrusion malocclusion were used to evaluate the following measurements: nasolabial angle, distance from lips to E line, distance from lips, incisors, tip of the nose and soft tissue pogonion to Sy line. Results: All measurements showed significant changes after treatment (p<0.05), except the distance from lips and soft tissue pogonion to Sy line. There was a positive correlation between the retraction of incisors and the change of upper and lower lips (0.803/0.925; p<0.001). Conclusion: The profile retrusion observed occurred more due to nose growth than to lips retraction. The response from soft tissues to incisors retraction showed a great variability.