Temporomandibular disorder
(TMD) is a heterogeneous group of
disorders affect the temporomandibular
joints, the masticator muscles, or both.
TMD generally develops orofacial pain
as a primary symptom. Approximately
10 % of all orofacial pain patients who
complain of tenderness in the masticator
muscles for more than one month
are diagnosed as TMD (1,2). TMD
patients often complain of
psychosomatic symptoms such as sleep
disorder, headache, fatigue, and
depression, which are characterized as
functional somatic syndromes (FSS