The author performed this study to investige the relationship between condylar movements recorded with Pantrak and mandibular rotational torque movements with BioEGNa. For this study 56 patients with Temporomandhbular disorders(TMD) and 30 dental students without any masticatory signs and symptoms were selected as patients group and control group, respectively.
Die items recorded with Pantronic`®(Denar Corp., USA) were immediate side-shift, progressive side-shift, angle d orbiting path, protrusive path and PRL BioEGN®(Bioelectnc gnathography, Bioresearch. Inc., USA) were used to measure the. amounts of mandibular rotational torque movements in frontal and horizontal plane, and the distance et mandibular translation at incisal area. Amount of mandibular rotational torque movement depicted between the cor)dyies was automatically analyzed by angle and difference in frontal and horizontal plane.
The obtained data were processed with SAS ´program and the conclusion of this study were as follows : j
1. Mean values of items between patients group and control group in Pantronic measurements were not significantly different except in left protrusive path and in Pantronic Reproducibility Index(PRI). There were no significant difference of condylar paths by preferred chewing side and affected side between the two groups.
2. The amount of mandibular rotational torque movements were differed in frontal angle and difference on protrusion, and in frontal and in horizontal difference on left excursion between the two groups. But the amounts d translatory movements were actually same on all eccentric movements.
3. The amount of mandibular rotational torque movements with splint were almost not changed from those without splint, with the exception of in horizontal measurements on protrusion.
4. The correlations of items between in Pantronic measurements and in BioEGN measurements were not consistently significant, however, generally the ISS related significantly with horizontal torque movement positively, and with frontal torque movement negatively. On the contrary, the PSS showed positive correlation with frontal torque movement, and negative correlation with horizontal torque movement.
|