title: Changes in soft tissue profile following treatment with the bionator.
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 for age, 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 degrees decrease in ANB, a 3.35 mm increase in anterior facial height, 2.22 degrees decrease in soft tissue profile convexity, and 17.4 degrees increase in mentolabial angle.
authors.affiliation: Department of Orthodontics, Case Western Reserve University, Cleveland 44106-4905, USA.
authors.forename: D W
authors.initials: DW
authors.lastname: Lange
authors.forename: V
authors.initials: V
authors.lastname: Kalra
authors.forename: B H
authors.initials: BH
authors.lastname: Broadbent
authors.forename: M
authors.initials: M
authors.lastname: Powers
authors.forename: S
authors.initials: S
authors.lastname: Nelson
mesh_terms: D000202:Activator Appliances; D000367:Age Factors; D002508:Cephalometry; D002648:Child; D005145:Face / Q000033:anatomy & histology*; D005260:Female; D006801:Humans; D008046:Lip / Q000254:growth & development; D008297:Male; D008312:Malocclusion, Angle Class II / Q000628:therapy*; D008334:Mandible / Q000254:growth & development; D016555:Matched-Pair Analysis; D008445:Maxillofacial Development; D009971:Orthodontics, Corrective / Q000379:methods*; D016896:Treatment Outcome; D014716:Vertical Dimension