Mandibular movements were compared between 56 closed lock patients and 20 asymptomatic controls by means of jaw tracking data. Statistical significant differences between the two groups were disclosed in the following items; maximum vertical and horizontal distance, the distance and area on opposite lateral extrusion, maximum and mean closing velocity, synchronized opening and closing track, and opening points from bilateral movements. These results suggest the possibility of mandibular kinesiological diagnosis of internal derangement of the temporomandibular joint.
