咀嚼運動から捉えた咬合面形態

抄録

Chewing movements were analyzed using mandibular movement analyzers ; Gnathohexagraph with some modifications and Syrognathograph, in order to restore appropriate occlusal morphology for chewing movements.
In addition to the analysis of subjects with typical chewing patterns, effects of occlusal morphology on chewing movements were studied by making occlusal adjustments, creating occlusal interferences, etc.
The results showed that there were two types of chewing movements, chopping type and grinding type, and that the latter consists of two subtypes, one with inadequate guidance and the other with no guidance.
The mandible was found to move backward and downward upon opening in chewing movements unlike border movements, resulting in occlusal interferences in the areas regarded as interference-free in traditional occlusion theories. The study also demonstrated that ICP was reached with a time lag between the right and left side rather than simultaneously on both sides. The study thus provided detailed information on chewing movements.
The results obtained in this study differed in several aspects from the existing occlusion concepts based on the observations and measurements made on mounted models, which may be attributable to the failure of articulators to accurately reproduce movements of the living system.