How does orthodontic treatment affect young adults' oral health-related quality of life?

Introduction: Studies in the dental literature do not yet provide conclusive evidence for the functional and psychosocial benefits of orthodontic treatment. In this cross-sectional study, we aimed to assess the oral health-related quality of life of young Brazilian adults, aged 18 to 30 years, who had completed orthodontic treatment compared with untreated subjects waiting for treatment. Methods: The subjects were recruited at a state-funded university clinic. The sample comprised 100 patients in the retention phase of orthodontic treatment for more than 6 months (treated group) and 100 persons who were seeking orthodontic treatment and were still on a waiting list (nontreated group). Data were collected by using the oral health impact profile, the index of orthodontic treatment need (malocclusion severity and esthetic impairment), the Brazilian economic classification criteria (socioeconomic status), and the index of decayed, missing, and filled teeth (oral health status). Statistical analyses were performed by using chi-square and Fisher exact tests and negative binomial regression. Results: The mean oral health impact profile scores were 3.1 (SD +/- 2.99) and 15.1 (SD +/- 8.02) in the treated and nontreated groups, respectively. The most frequent impacts in the treated and nontreated groups were painful aching and been self-conscious, respectively. Comparisons between the groups were controlled for malocclusion severity, clinician-assessed esthetic impairment, age, sex, socioeconomic status, and oral health status. Nontreated young adults had mean oral health impact profile scores 5.3 times higher than did the treated subjects. Conclusions: Young Brazilian adults who received orthodontic treatment had significantly better oral health-related quality of life scores in the retention phase, after treatment completion, than did nontreated subjects. (Am J Orthod Dentofacial Orthop 2012;141:751-8)