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Volume 17 , Issue 1
Winter 2003

Pages 2128

Prevalence of Temporomandibular Disorder Subtypes, Psychologic Distress, and Psychosocial Dysfunction in Asian Patients

Adrian U. J. Yap, BDS, MSc, PhD, FAMS, FADM, FRSH, Samuel F. Dworkin, DDS, PhD, E. K. Chua, BDS, MDS, Thomas List, DDS, ODont Dr, Keson B. C. Tan, BDS (Hons), Cert. Prosthodont, MSD, FAMS, H. H. Tan, BDS, MDS, FRACDS

PMID: 12756927

Aims: To use the Research Diagnostic Criteria for Temporomandibular Disorders (RDC/TMD) to investigate the physical diagnoses, psychologic distress, and psychosocial dysfunction in Asian TMD patients. The RDC/TMD Axis I and II findings were compared to those of Swedish and American TMD patients. Methods: One hundred ninety-one patients (53 male and 138 female) referred to 2 institutionalized TMD clinics in Singapore were enrolled in the study. The mean age of the predominantly Chinese population (83.2%) was 33.6 9.3 years. Data from a RDC/TMD history questionnaire and clinical examination were fed directly by patients and clinicians into a computerized diagnostic system (NUS TMDv1.1). Axis I and II findings were generated on-line, based on RDC/TMD rule engines. Data were automatically exported to SPSS for statistical analysis. Results: Group I (muscle) disorders were found in 31.4% of the patients; Group II (disc displacement) disorders were found in 15.1% and 15.7% of the patients in the left and right temporomandibular joints, respectively; and Group III (arthralgia, arthritis, and arthrosis) disorders were found in 12.6% and 13.0% of the patients in the left and right joints, respectively. Axis II assessment of psychologic status showed that 39.8% of patients experienced moderate to severe depression and 47.6% had moderate to severe nonspecific physical symptom scores. Psychosocial dysfunction was observed in only 4.2% of patients based on graded chronic pain scores. Conclusion: Axis I and II findings of Asian TMD patients were generally similar to their Swedish and American cohorts. In all 3 populations, women of child-bearing age represented the majority of patients. Muscle disorders were the most prevalent type of TMD. A substantial portion of TMD patients were depressed and experienced moderate to severe somatization. J OROFAC PAIN 2003;17:2128.

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