Which of the following conditions is the most frequent cause of pain in the masticatory system, including the temporomandibular joint (TMJ)?

Explanation

Among the listed disorders, myofascial pain dysfunction syndrome is the most common cause of discomfort affecting the muscles of mastication and the TMJ. Traumatic arthritis and degenerative arthritis are less frequent, while trigeminal neuralgia involves nerve pain rather than muscular or joint pain.