Development of jaw muscles' function in rats fed a kneaded diet

概要

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To clarify the effect of chewing foods on the development of jaw muscles' function, 41 Wister male rats were divided into the solid (group S, n=20) and the kneaded (group K, n=21) diet groups at 16 days of age and fed their respective diets till the end of the experiment. At 5, 8 and 11 weeks of age, electromyograms of the masseter (Ma), medial pterygoid (Mp), temporal (Tm) and digastric muscles (Di) were recorded when both groups intook and chewed the solid diet. Results indicated that : 1) The intake phase of the diet was shorter, but the chewing phase was longer in group K. Numbers of bursts were less in the intake phase, but greater in the chewing phase in group K. 2) Time lag of activity onset of Di from that of Ma during chewing was longer, and those lags of jaw closing muscles from that of Di were shorter in group K. 3) Mp showed greater burst activitiy in group K. 4) Activity duration of jaw closing muscles decreased after 5 weeks of age in group K. Therefore, alternate activitise of jaw opening and closing muscles were shown to be more developed in group K than group S.
日本矯正歯科学会の論文