Temporomandibular Disorder
Pronunciation: tem-poh-roh-man-DIB-yoo-lar
Also written as: TMD — Temporomandibular Disorder
A collective term for conditions affecting the temporomandibular joint (TMJ) and the muscles of mastication, often causing jaw pain, clicking, and restricted mouth opening.
Full Definition
Temporomandibular disorder (TMD) encompasses a range of musculoskeletal and neuromuscular conditions involving the temporomandibular joints, masticatory muscles, and associated structures. Clinical presentations include pain on jaw movement, joint clicking or crepitus, trismus, headache, and earache. Editors must be aware that 'TMD' (the disorder) and 'TMJ' (the joint itself) are not interchangeable; a patient has TMD, not 'a TMJ.' This is one of the most common misuses in dental copywriting and patient information leaflets. Research articles may further subdivide TMD into myalgia, arthralgia, and disc displacement categories.
Usage
Usage note: 'TMJ' refers to the temporomandibular joint (anatomy); 'TMD' refers to the disorder affecting that joint. Using 'TMJ' as a shorthand for the disorder is incorrect in clinical and editorial contexts.
In Context
- "The patient was referred to an oral medicine specialist following a diagnosis of temporomandibular disorder with bilateral joint clicking." — GP referral letter
- "The patient information leaflet incorrectly used 'TMJ' when describing the disorder; 'TMD' is the correct term for the condition itself." — Patient information leaflet editorial review