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    • TMD is one of the most common chronic orofacial pain conditions confronting dentists and other health care providers.
    •  The American Academy of Orofacial Pain in 1996 defined TMD as “a collective term embracing a number of clinical problems that involve the masticatory musculature, the TMJ and associated structures or both”.
    •  Etiology of TMD remains mired in controversy. Few would dispute that multiple factors influence the evolution of these disorders. However, no consensus has been reached on the degree to which any of these factors has a part.
    • The goals of  TMD management include: reduce pain; restore normal jaw function; reduce the need for future health care and restore normal lifestyle functioning.
    •  A wide varieties of management proposed are intraoral appliances; behavioral therapy; pharmacotherapy and placebo. An alternative mode of management is TENS.
    • TENS is a well-known physical therapy, which is useful for the relief of pain. TENS is a safe, noninvasive, reversible, effective and swift method of analgesia and potential adverse reactions of other methods of pain control are eliminated.
    • TENS is widely used to relieve acute and chronic pain in various conditions like muscle and joint pain, back pain, lower and upper extremity pain, and head and neck pain, etc.
    • However, TENS studies to evaluate the effectiveness on TMJ pain are only few. So a need was felt to conduct a clinical trial to assess pain relieving effects of TENS therapy in TMD.

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