title: Effect of year one orthodontic treatment on the quality of life of adolescents, assessed by the short form of the Child Perceptions Questionnaire.
abstract: OBJECTIVE
  To evaluate the effect of the first 12 months of orthodontic treatment on the quality of life of Brazilian adolescents and to examine the evaluative properties of the short form of the Child Perceptions Questionnaire (CPQ11-14).
  
  
  METHODS
  This study involved a sample of 101 adolescents undergoing orthodontic treatment with a fixed appliance. Participants were asked to answer the Brazilian version of the short form of the CPQ11-14 before treatment (T1) and 12 months after the placement of the fixed appliance (T2). Statistical analysis was carried out using the Wilcoxon signed-rank test and the Bonferroni correction for the overall score and the short form of the CPQ11-14 subscales. Responsiveness of the measure and the minimal clinically important difference (MCID) were also evaluated.
  
  
  RESULTS
  Out of the 101 individuals originally admitted to this study, three were excluded due to cessation of treatment and failure to return the questionnaire, providing a response rate of 97.0%. Statistically, significant improvements were found in the overall score (P < 0.001) as well as in both emotional well-being (P < 0.001) and social well-being (P = 0.007) subscales. The reductions in score were associated with an effect of size showing moderate clinically meaningful changes in the overall score and in the functional limitations, emotional well-being and social well-being. The MCID was 3.35.
  
  
  CONCLUSIONS
  The first 12 months of orthodontic treatment with a fixed appliance had a positive effect on the quality of life of western adolescents.
authors.affiliation: Department of Pediatric Dentistry and Orthodontics, School of Dentistry, Federal University of Minas Gerais, Avenida Antonio Carlos, 6627, Pampulha, Belo Horizonte, MG, 31270-901, Brazil, lucasgabreu@bol.com.br.
authors.forename: L G
authors.initials: LG
authors.lastname: Abreu
authors.forename: C A
authors.initials: CA
authors.lastname: Melgaço
authors.forename: E M B
authors.initials: EM
authors.lastname: Lages
authors.forename: M H N G
authors.initials: MH
authors.lastname: Abreu
authors.forename: S M
authors.initials: SM
authors.lastname: Paiva
mesh_terms: D000293:Adolescent; D000294:Adolescent Behavior; D001294:Attitude to Health; D002648:Child; D004644:Emotions; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D061326:Index of Orthodontic Treatment Need; D007398:Interpersonal Relations; D008297:Male; D008310:Malocclusion / Q000145:classification / Q000523:psychology; D009967:Orthodontic Appliances; D009971:Orthodontics, Corrective / Q000523:psychology*; D011788:Quality of Life