Assessment of facial profile changes in Class I biprotrusion adolescent subjects submitted to orthodontic treatment with extractions of four premolars

Claudia Trindade MATTOS, Mariana MARQUEZAN, Isa Beatriz Barroso Magno CHAVES, Diogo Gonçalves dos Santos MARTINS, Lincoln Issamu NOJIMA, Matilde da Cunha Gonçalves NOJIMA

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.

Keywords: Class I Angle malocclusion. Dental extraction. Dental esthetics. Facial profile.

How to cite: Mattos CT, Marquezan M, Chaves IBBM, Martins DGS, Nojima LI, Nojima MCG. Assessment of facial profile changes in Class I biprotrusion adolescent subjects submitted to orthodontic treatment with extractions of four premolars. Dental Press J Orthod. 2012 May-June;17(3):132-7.

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