This study was performed to investigate the clinical features of internal derangement of temporomandibular joint. For this study, 117 patients with temporomandibular disorders and 81 dental students without any signs and symptoms of temporomandibular disorders were selected as the patients group and as the control group, respectively. Preferred chewing side, Angle´s classification,, lateral guidance pattern, maximal-. mouth opening range, and affected side were recorded clinically.
Ilead and shoulder posture was measured in a groundplate on which square diagram of five centimeters each had been drawn, and cephalograph was also taken for measurement of head and neck posture. Sonopaklk of Biopak system(Bioresearch Inc., USA) was used to record joint vibration for evaluation of internal healthy status of temporomadibular joint. The data collected were analyzed by SAS statistical program.
The results of this study were as follows:
1. Frequency of left side chewing subjects was higher in patients than in control group, but there was no difference in distribution of subjects by Angle´s classification. Other types was prevalent in patients whereas group function was more in control group for lateral guidance pattern.
2. As to lateral guidance pattern by clinical diagnosis, patients with internal derangement and/or degenerative joint disease showed higher frequency of the other types, whereas patients with muscle disorder showed canine guidance. This finding was consistent with the result by Sonopak impression.
3. There was no difference for shouder height between the two groups, however, tilting of head
and backward extension of cervical spine was more frequent in control group.
4. Acromion was positioned more anteriorly in patients with internal derangement and/or
degenerative joint disease than in control group and angle between eye and tragus was larger
in patients. Patients with degenerative joint disease showed control group did in cephalometric profile.
5. Maximal mouth opening range in patients with internal derangement was the least in all subgroups in patients classified by Sonopak impression
more flexed head posture than
|