Research of condylar movements on protrusive and lateral jaw positions (3rd report)

Abstract

“A large number superposition graph” was made out of curved lines of condylar top and center. And then, the relation between front wall of mandibular fossa and condylar path was researched with computer graphics.The results obtained were as follows:1. The reasonable range of condylar path; nonworking side of lateral movement was 4.210mm on average of both sides, protrusive movent was 4.203mm.2. The relation between the front wall and condylar path was shown by superposition graph. On the nonworking side, 37 examples were in parallel type, 49 examples were in closing type, 6 examples were in opening type and 8 examples were in undefined type. While on the protrusive movement, 41 examples were in parallel type, 44 examples in closing type, 7 examples in opening type and 8 examples in undefined type.3. In reasonable range, the gradient of front wall was 54.86° and inclination of sagittal condylar path was 47.93° on the nonworking side, while the gradient of front wall was 54.70° and inclination of sagittal condylar path was 48.43° on the protrusive movement.