Abstract
The author for the purpose of clarifying the aspects of masticatory movements and their transitions who possesses a normal set of dentate jaws of group functioned occlusion, recorded the ranges of frontal masticatory movements with the Saphon visi-trainer C-II. Then, the analysis and examination of the frontal masticatory movements were conducted by means of the quantitative analysis. As a result, the following conclusions were obtained.
1) In the mastication of peanuts and TAKUAN, about the same ranges were observed in the early and the middle periods but the ranges decreased in the late period.
2) In the mastication of ham, the ranges were large in the early period but they decreased in the middle and the late periods.
3) In the mastication of peanuts, the variation rates in the early and the middle periods were 74.4-112.2% and those in the late period were 47.7-100.2%, respectively.
4) In the mastication of ham, the variation rates in the early period and those in the middle and the late periods were 49.5-80.9% and 77.7-108.0%, respectively.
5) In the mastication of TAKUAN, the variation rates in the early and the middle periods were 70.5-117.2% and those in the late period were 78.1-139.5%, respectively.
