Objectives: To determine the frequency of temporomandibular disorders and investigate their relationship with sleep quality in 18 and 19-year-old adolescents.Methods: Cross-sectional design; dysfunctions were diagnosed using the Research Diagnostic Criteria for Temporomandibular Disorders and sleep was assessed using the Pittsburgh Sleep Quality Index in 200 students. Data were analyzed by frequency distribution and using the chi-square test and Student's t test.Results: 35.5% dos adolescents had dysfunctions. The mean total score of adolescents with dysfunctions was 7.34 and 4.76 for adolescents without dysfunctions (p < 0.001). 82% of the participants were free from dysfunctions. 17% of those with dysfunctions had good sleep quality. Conclusions:The frequency of dysfunctions was elevated and dysfunctions were associated with poor sleep quality. The study design does not allow it to be determined whether poor sleep quality is a cause or a consequence of TMDs, which can be elucidated in future studies. J Pediatr (Rio J) IntroduçãoDisfunções temporomandibulares (DTMs) são definidas como dor nos músculos mastigatórios e/ou na articulação temporomandibular (ATM), movimentos limitados ou assimétricos e ruídos na ATM 1 . Sua prevalência é elevada e difere de acordo com a população estudada e o crité-rio diagnóstico utilizado 2 , variando de 9,8 a 74% 3 . Seus sinais e sintomas são comuns na adolescência, período caracterizado por intensas mudanças físicas, hormonais, emocionais, sociais e cognitivas 4 .A etiologia das DTMs é multifatorial, com diversos fatores associados. Maloclusão, hábitos parafuncionais e alterações psicossociais 2 , em indivíduos com baixa tolerância fisiológi-ca, podem levar à hiperatividade muscular mastigatória e, consequentemente, às DTMs. Essa tolerância 1 é influenciada pelo estado geral de saúde, nutrição e qualidade do sono.Sugere-se que a puberdade esteja associada às altas taxas de distúrbios do sono e que esses podem estar relacionados às dificuldades psicológicas ou sociais do adolescente 5 . Al- Artigo submetido em 27.09.11, aceito em 04.01.12.http://dx
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