This study was designed to investigate the effects of TMJ incoordination to condylar movements, especially, the ISS. The sounds are one of the symptoms in TMJ incoordinated disorder, and it may cause the changes of mandibular movement trajectory. 19 students with only TMJ sounds and 16 students with no TMJ problems participated in this study. The subject performed Rt. lateral, Lt. lateral and protrusive movements, and repeated 3 times on each movement. Pantronic was used to record the measures of condylar movement paths.
The obtained results were as follows
1. The mean values of RISS and LISS in control group were 0.29mm, 0.36mm repectively, and those in experimental group were 0.49mm, 0.41mm repectively. The mean values of RISS was higher in expcr::nental group than that of RISS in control group.
2. Correlation coefficients between PRl and RISS, LISS were slightly higher in experimental group than those in control group, therefore, PRI was more likely to be affected by ISS in experimental group.
3. In control group PRI was correlated to RISS, LORB, RPRO and LPRO, but in-experimental group PRI was not correlated to those items. From the study, the author knew that the condylar movements was stable in control group.
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