Abstract
Cephalometric laminagrams of T. M. J. under the mandibular movements were obtained with “Sectograph”. They were four positions on nonworking side of lateral movement and on protrusive movement. The purpose of this first report was to research the shape of front wall of mandibular fossa, and also to research the movements of condylar top and center with computer operated superposition method and interpolation method. In this study, the standard of horizontal plane was F-H-L.
The results obtained were as follows:
1. Continuous condylar movement could be known through a few sectograms with computer graphics.
2. Anatomical gradient of the front wall of mandibular fossa was 40.41° on average of both sides right and left, and prosthetic gradient was 55.18°.
3. The curved line of condylar center was highly the same with that of condylar top.
4. The condyles under the lateral and protrusive movements showed bodily shift.
