[Electromyographic and electrognathographic analysis of patients with juvenile rheumatoid arthritis].

Seven patients, affected by JRA, underwent an examination by electromyography and electrognathography, to judge variations in the activity of some masticatory muscles and in the movements of the jaw. The muscular activity and masticatory mechanics show a reduction in the freedom of movement. The system cannot work in all the positions allowed by the physiological mobility of the TMJ.