RESUMO
OBJECTIVES: This study investigated whether the impacts of orthodontic treatment of malocclusion on oral health-related quality of life and happiness are positive with middle and high school students. METHODS: Subjects were 157 orthodontic patients and 83 non-orthodontic in malocclusion patients. Questionnaires were collected with the self-administered method, and consisted of the general characteristics, self-esteem, social support appraisal scale(friends, family, teacher), Oral Impact on Daily Performance (OIDP) and oxford happiness questionnaire (OHQ). RESULTS: A physical factor was lower in the orthodontic treatment group (5.8±2.48) than in the non-orthodontic treatment group (7.7±2.10)(p<0.001), and OIDP was lower in the orthodontic treatment group (7.0±1.79) than in the non-orthodontic treatment group (7.8±1.80)(p=0.002). A feeling of happiness was higher in the orthodontic treatment group(4.6±0.81) than in the orthodontic treatment group (4.3±0.89) (p=0.009). As results of multiple regression analysis, OIDP was affected of orthodontic treatment(β=−0.0222, p=0.001) and OHP was affected of orthodontic treatment(β=0.087, p=0.030) and OIDP(β=0.116, p=0.003). CONCLUSIONS: Orthodontic treatment of malocclusion may positively affects happiness in teenager. Support policy for orthodontic treatment of malocclusion is necessary for adolescents.