Temporomandibular joint disorder (tmjd, tmj or tmd),or tmj syndrome, is an umbrella term covering acute or chronic inflammation of the temporomandibular joint, which connects the lower jaw to the skull.
The disorder and resultant dysfunction can result in significant pain and impairment.
The temporomandibular joint is susceptible to many of the conditions that affect other joints in the body, including ankylosis, arthritis, trauma, dislocations, developmental anomalies, and neoplasia.
Disorders of the teeth can contribute to TMJ dysfunction. Tooth mobility and tooth loss can be caused by destruction of the supporting bone and by heavy forces being placed on teeth.
Movement of the teeth affects how they contact one another when the mouth closes, and the overall relationship between the teeth, muscles, and joints can be altered. Pulpitis, inflammation of the dental pulp, is another symptom that may result from excessive surface erosion.