[Prevalence of temporomandibular disorders among industrialworkers. Association with stress and sleep disorder].

Objective To determine the presence of temporomandibular disorders (TMD), sleep disorders and stress, as well as the association between these factors, among industrial workers in São Paulo State, Brazil. Material and Methods Fonseca's questionnaire was used to verify the level of TMD, the Toronto Sleep Assessment Questionnaire (SAQ) was applied to check the quality and occurrence of sleep disorders, and the Social Readjustment Rating Scale (SRRS) was used to check the degree of stress. The data collected were tabulated with Epi InfoTM 7 and statistically analyzed using the chi-square test, with a 5 % significance level. Results 104 workers participated in the survey. Most were male (74 %) between 35 and 44 years of age (26 %). Thirty-seven (35.6 %) had some degree of disorder, 65 (62.5 %) presented with sleep disorders, and 6 (5.8 %) presented with higher degrees of stress. After statistical analysis, there was no significant association between stress and temporomandibular disorders (TMD). However, there was an association between quality of sleep and sex of the individual with TMD (p<0.01). Conclusion We conclude that a high percentage of the analyzed population has sleep disorders and TMD. Sex and the quality of sleep influence the occurrence of TMD.