CHEWING PATTERN-ANALYSIS IN TMD PATIENTS WITH AND WITHOUT INTERNAL DERANGEMENT .2.

In order to investigate the chewing movement of temporomandibular diso rders (TMD) patients with and without internal derangement of the temp oromandibular joint (TMJ), the velocity of chewing movement was analyz ed in 103 TMD patients with unilateral internal derangement (ID group) , 94 TMD patients without internal derangement (NID group) and 10 norm al subjects (normal group). The ID group showed a significantly reduce d maximum opening velocity, a significantly smaller standard deviation for the velocity and a significantly frequent opening velocity patter n with a deceleration in the middle of opening compared to the NID or the normal groups. The NID group demonstrated significantly frequent o pening velocity patterns without any velocity peak compared to the ID or normal groups.