title: Soft-tissue treatment changes in Class II Division 1 malocclusion with and without extraction of maxillary premolars.
abstract: BACKGROUND
  In this study, we compared the soft-tissue changes and posttreatment status after nonextraction and maxillary premolar extraction treatment in patients with Class II Division 1 malocclusion.
  
  
  METHODS
  Lateral cephalograms of 44 patients, divided into 2 matching groups, were evaluated. Group 1 comprised 22 patients (10 boys, 12 girls) treated nonextraction with initial and final mean ages of 12.50 and 15.12 years, respectively, and a mean treatment time of 2.62 years. This group had an initial mean overjet of 7.97 mm. Group 2 consisted of 22 patients (10 boys, 12 girls) treated with extractions of 2 maxillary premolars with initial and final mean ages of 12.86 and 15.32 years, respectively. The mean treatment time was 2.46 years, and the initial mean overjet was 8.61 mm. Independent t tests were used to compare the initial and final cephalometric status and the treatment changes between the groups.
  
  
  RESULTS
  According to the results, only 1 soft-tissue variable showed a significant treatment change between the groups. However, at the posttreatment stage, there were no significant differences between the soft-tissue variables.
  
  
  CONCLUSIONS
  The protocol including extraction of 2 maxillary premolars provides similar soft-tissue results as nonextraction treatment of complete Class II malocclusion.
authors: Department of Orthodontics, Bauru Dental School, University of São Paulo, São Paulo, Brazil. jansong@travelnet.com.br
authors: Guilherme
authors: G
authors: Janson
authors: Acácio
authors: A
authors: Fuziy
authors: Marcos Roberto
authors: MR
authors: de Freitas
authors: José Fernando
authors: JF
authors: Castanha Henriques
authors: Renato Rodrigues
authors: RR
authors: de Almeida
mesh_terms: D000293:Adolescent; D001641:Bicuspid / Q000601:surgery; D002508:Cephalometry; D002648:Child; D005145:Face / Q000033:anatomy & histology*; D005260:Female; D006801:Humans; D008297:Male; D008312:Malocclusion, Angle Class II / Q000628:therapy*; D009971:Orthodontics, Corrective / Q000379:methods*; D012189:Retrospective Studies; D014081:Tooth Extraction; D016896:Treatment Outcome