Evaluation of Association between the Severity of Temporomandibular Disorders and Quality of Sleep in a Selected Iranian Population
Introduction: Temporomandibular disorder (TMD) as a prevalent condition has been reported that relates to changes in sleep quality. This study aims to assess the association between TMD severity and sleep quality in a selected Iranian population by the application of the Helkimo index and Pittsburgh Sleep Quality Index (PSQI) questionnaire.
Methods: This study comprised of 50 non-TMD subjects and 150 TMD patients which were equally selected from each TMD severity category. The study conducted in School of Dentistry, Shiraz University of Medical Sciences (Shiraz, Iran). Patients were first examined and categorized into four TMD severity groups according to the Helkimo index: Non-TMD, mild, moderate, and severe. Then, patients completed PSQI, a standard version translated into Persian and adjusted for Iranian patients.
Results: Comparison of mean PSQI scores of the four groups revealed a significant difference (P<0.001). Pairwise comparisons showed that the study groups severe, moderate, mild, and control received the highest to the lowest PSQI scores (12.26±2.35, 8.20±1.92, 6.88±1.89, and 5.28±1.32, respectively). Similarly, a regression analysis indicated that by controlling the effect of demographic variables, mean PSQI was significantly increased as TMD severity increased.
Conclusion: In conclusion, all three categories of mild, moderate, and severe TMD patients showed poor quality of sleep in comparison with non-TMD controls in our study. That is, the higher the severity of the disease, the lower the sleep quality.
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