Traditional methods to measure oral health based on clinical standards are limited because they do not consider psychosocial and functional aspects of oral health. It has been recommended that this measures need to be supplemented by data obtained from patients regarding their individual perceptions on oral health-related quality of life (OHRQoL). Happiness is a multidimensional construct comprising both emotional and cognitive domains, and has been defined as "the degree to which an individual judges the overall quality of his or her life as a whole favorably". It has been associated with several health outcomes, including oral health. This study aims to follow a cohort of 1134 children evaluated in Santa Maria - RS in 2012, and assess the influence of oral health conditions in their subjective happiness during the transition from childhood to adolescence. All children examined in 2012 will be revaluated in 2014 and 2016: oral examinations will be conducted to assess dental caries, dental trauma, malocclusion and gingival conditions. Moreover, children will respond to the Brazilian versions of Subjective Happiness Scale (SHS) and Child Perceptions Questionnaire (CPQ 11-14). Statistical analysis with multilevel Poisson regression model will consider the measures over time clustered within individuals, and the individuals clustered within schools. Data will be analyzed through the changes on psychosocial aspects of the adolescents (differences in scores of subjective happiness) by estimating the effect size and the statistical significance of the change in scores over time.
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