Effects of Anxiety Symptoms on the Masticatory Muscle Activity of Subjects with TMD-Pain Diagnoses
Nasir, Khawaja Shehryar
MetadataShow full item record
Temporomandibular disorders (TMD) is a collective term embracing a number of clinical problems that involve the masticatory muscles, the temporomandibular joint and associated structures, or both The prime manifestation of TMD consists of pain, of a persistent, recurring, or chronic nature. A multidimensional approach to the understanding of the TMD induced pain that incorporates a biopsychosocial model has gained acceptance. This model places presence of psychological factors such as, anxiety symptoms, firmly in the realm of pain research and clinical practice. The present investigation assesses the association between masticatory muscle activity (MMA) thresholds of masseter and temporalis muscles during awake and sleep among TMD-pain diagnostic groups and the effect of the presence of the anxiety symptoms on this association. Using the Diagnostic Criteria for the Temporomandibular disorders (DC-TMD) and Generalized Anxiety Disorders 7-item (GAD-7) scale participants were diagnostically categorized. Subjects used a custom monitoring system, which recorded in-field muscle activities. Thirty-seven (37) females and twenty-two (22) males participated in this study. Using the Whitney-Mann U test, it was determined that the masseter MMA during the sleep period was significantly associated in a positive direction with the TMD-pain diagnoses during 25 %, 50 %, and 80 % thresholds. Data suggest a trend of increased masseter MMA in the TMD-pain diagnoses group both during awake and sleep periods, and increased temporalis MMA in the TMD-pain diagnoses group during the sleep period. Furthermore, using the Kruskal-Wallis test, it was determined that TMD-pain diagnoses and masseter MMA association was same, regardless of the presence or the absence of the anxiety symptoms. This data support the association between masticatory muscle hyperactivity and painful-TMD conditions.