Interlabial gap behavior with time

• Published in: Journal of the world federation of orthodontists Vol. 2; no. 4; pp. e175 - e179
• Main Authors: Janson, Guilherme, Santos, Patrícia Bittencourt Dutra dos, Garib, Daniela Gamba, Francisconi, Manoela Fávaro, Baldo, Taiana de Oliveira, Barros, Sérgio Estelita
• Format: Journal Article
• Language: English
• Published: 01.12.2013
• Subjects: Dentistry; Tooth extraction; Lip; Cephalometry
• ISSN: 2212-4438; 2212-4438
• DOI: 10.1016/j.ejwf.2013.11.001

Abstract Background The purpose of this study was to evaluate the long-term behavior of the interlabial gap in patients with Class I and Class II malocclusion after orthodontic treatment and to investigate whether interlabial gap behavior is related to treatment with or without extraction. Methods Lateral head-films at the pre- and post-treatment and long-term follow-up stages were obtained from 61 patients who initially had Class I or Class II malocclusion and with pre- and post-treatment lip incompetence, who were treated with or without extraction. Dependent and independent Student's t tests were used for the intra- and intergroup comparisons. Results There were significant interlabial gap reductions of 1.64 and 1.72 mm in Class I and II, respectively, but there was no significant intergroup difference. Nonextraction patients had significantly greater interlabial gap reduction (2.7 mm) than did extraction patients (1.3 mm) in the long-term. Conclusions It was concluded that the interlabial gap decreases significantly and similarly in treated Class I and Class II malocclusion patients and that nonextraction treatment has greater interlabial gap reduction than does extraction treatment in the long-term post-treatment period.