title: Changes in soft-tissue profiles after treatment of class II/1 patients with bite-jumping appliances.
abstract: We performed this study to describe changes in the soft-tissue profile after orthodontic treatment with Tränkmann's bite-jumping appliances. A total of 69 patients thus treated were compared to a control group of 36 age-matched patients based on cephalograms. Statistical analysis included mean values, standard deviations, t-tests, and Pearson's correlation testing. Highly significant (p<0.001) changes in total profile angle (N'-Ns-Pog') were observed over the course of treatment. Furthermore, a mildly significant (p<0.05) correlation with SNA angles was noted. Changes in the soft-tissue profile angle (N'-Sn-Pog') were moderately significant (p<0.001). The profile angles of the upper lip (Sn-SS-Ls) and lower lip (Pog'-Sm-Li) did not reveal significant changes. We observed highly significant (p<0.001) findings in the esthetic line (NsPog') advancement relative to the Ls and Li landmarks and in increases in lower-face height. Midface heights remained unchanged. Our results indicate that treatment with bite-jumping appliances results in increased facial convexity, advancement of the esthetic line, and increased lower-face height. The cumulative effects of growth and treatment do not, however, appear pronounced enough to result in a preference for or against treatment with a bite-jumping appliance.
authors: Department of Orthodontics, University Hospital Saarland, Homburg/Saar, Germany. joerg.lisson@uniklinikum-saarland.de
authors: Jörg Alexander
authors: JA
authors: Lisson
authors: Kay
authors: K
authors: Mokrys
authors: Gero Stefan Michael
authors: GS
authors: Kinzinger
authors: Bettina
authors: B
authors: Glasl
authors: Björn
authors: B
authors: Ludwig
mesh_terms: D000202:Activator Appliances; D000293:Adolescent; D002648:Child; D003238:Connective Tissue / Q000000981:diagnostic imaging*; D005145:Face / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D008297:Male; D008311:Malocclusion, Angle Class I / Q000000981:diagnostic imaging* / Q000534:rehabilitation*; D008312:Malocclusion, Angle Class II / Q000000981:diagnostic imaging* / Q000534:rehabilitation*; D011859:Radiography