Abstract
The purpose of this study was to clarify the difference of the mandibular movement between the normal occlusion and the skeletal mandibular protrusion.
The sagittal inclination of condyle paths and the horizontal inclination of condyle paths were examined.
The results were as follows:
1. The sagittal inclination of condyle paths of the normal occlusion was statistically larger than that of the mandibular protrusion.
2. The sagittal inclination of condyle paths of the normal occlusion in anterior movement had a close correlaretion to that in mastication, but the mandibular protrusion had no relation thereto.
3. The horizontal inclination of condyle paths of the normal occlusion in lateral movement was 12.3±2.7° and that of the mandibular protrusion was 13.0±9.6°.
4. The horizontal inclination of condyle paths of the normal occlusion in mastication was distinctly smaller than that in lateral movement, but the mandibular protrusion had no relation thereto.
