Abstract

The purpose of this study was to determine the changes in the soft tissue profile in patients treated in the mixed dentition with a bionator. Two groups of 30 individuals, between 9 and 12 years old and with Class II, Division 1, malocclusion were matched forage, sex, observation time, and dentofacial characteristics. Patients in the first group were treated with a bionator for an average of 18.7 months, resulting in a Class I molar relationship and reduction of overjet. The second group acted as a control and individuals did not receive any form of orthodontic treatment. Pretreatment and posttreatment cephalograms were analyzed and paired t-tests were used to compare the significance of changes between the two groups. Compared with the control group, the treated group demonstrated 1.97° decrease in ANB, a 3.35 mm increase in anterior facial height, 2.22° decrease in soft tissue profile convexity, and 17.4° increase in mentolabial angle.

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Author notes

D. William Lange is a former graduate student of the Department of Orthodontics at Case Western Reserve University, Cleveland, Ohio

Varun Kalra is an assistant professor in the Department of Orthodontics at Case Western Reserve University, Cleveland, Ohio, and is in the private practice of orthodontics in Shaker Heights, Ohio

B. Holly Broadbent, Jr. is a clinical professor in the Department of Orthodontics at Case Western Reserve University, and Director of the Bolton-Brush Growth Study Center, Cleveland, Ohio

Michael Powers is an assistant professor in the Department of Oral and Maxillofacial Surgery at Case Western Reserve University, Cleveland, Ohio

Suchitra Nelson is a research associate in the Bolton Brush Growth Study Center and the Department of Orthodontics at Case Western Reserve University, Cleveland, Ohio