The purpose of this study was to evaluate an effect of change on head posture initial occlusal contacts with measuring the distances between initial occlusal contacts and maximum intercuspal position at different head posture in TMDs patient. For
this
study, 24 patients from age 13 to 36 were selected, they were examined health history taken, patients who have sign and symptoms of TMDs were examine before the study. For the normal group, 21 adults from age 23 to 25 were selected. They have
normal or
class I molar relationship, and have no symptoms of TMJ or masticatory muscles, and some of them had restorations less than 3 areas on each tooth, and have no other prosthetic restorations.
Difference on distance between initial occlusal contact and maximum intercuspal position with mandibular kinesiography (MKG(r)) (K6 diagnostic system. Myo-tronic Inc, U.S.A.) in upright, supine, 45° extension. 30° flexion position of the head
were
measured. The Frankfort horizontal plane was used as a reference plane.
@ES The results were as follows
@EN 1. There were significant differences between initial occlusal contacts of the normal and patients group on upright position and 30°flexion of the head(p<0.05, p<0.01).
2. The positions of the initial occlusal contacts have a tendency to place anterior and inferior to maximal intercuspal position in upright position and 30°flexion of the head as well as posterior and inferior in supine position and
45°extension
of
the head in the noraml and patients groups.
3. There were significant differences among the initial occlusal contacts between upright and supine position and 30°flexion of the head, and 30°flexion and 45°extension of the head in the patient group(p<0.01).
The result have shown that after treatment on the supine position, it may be necessary to check occlusal contact on the upright position as well as flexion of the head. It may need careful adjustment in occlusal condition on upright position of
TMDs
patient.
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