Soft tissue profile changes in class II patients treated with first bicuspid extraction

Abstract

Objective: To assess soft tissue changes in the lip area after orthodontic treatment with first bicuspid extraction in 20 Angle class II patients.

Methods: A total of 40 profile cephalograms were digitized and measured: 20 obtained at baseline and 20 after treatment. Eighteen landmarks were marked on the cephalograms and analyzed using the Radiocef software version 4.0 (Radio Memory Ltda.). Linear and angular measurements were used to analyze changes in upper and lower lip position. Statistical analysis included calculation of error. Pre- and post-treatment measurements were compared using the Student t test for paired samples.

Results: Upper and lower lips showed a mean retrusion of 2 mm. There was a significant increase in the nasolabial angle, of 5.36°, leading to a decreased facial convexity. The upper lip angle (ULA) retruded -4.74°.

Conclusions: Our findings suggest that treatment of class II patients including first bicuspid extraction result in small changes in the patients’ facial profile (increased nasolabial angle and decreased upper lip angle).

Keywords: Profile, Face, Tooth Extractions, Lip, Orthodontics.