Functional differences between chewing on habitual chewing side and chewing on non-habitual chewing side

• Published in: Journal of Japanese Society for Mastication Science and Health Promotion Vol. 9; no. 2; pp. 57 - 64
• Main Authors: TOCHIKURA Jun, SHIGA Hiroshi, KOBAYASHI Yoshinori
• Format: Journal Article
• Language: English; Japanese
• Published: 特定非営利活動法人 日本咀嚼学会 2000; Japanese Society for Mastication Science and Health Promotion
• ISSN: 0917-8090; 1884-4448
• DOI: 10.14858/soshaku1991.9.57

In order to find the functional difference between habitual chewing and non-habitual chewing, 20 healthy subjects were asked to chew gumi-jelly on each side.The functional differences between habitual and non-habitual chewing sides were compared using the EMG rhythm as the indicator for masticatory movement function, the integral value of masseter muscular activity as the indicator for masticatory muscular activity, and the glucose secretion as the indicator for masticatory efficiency.As a result the following conclusions were obtained.1. As for the coefficients of variation for duration, interval and cycle time, the habitual chewing side had smaller values than the non-habitual chewing side in 17, 16 and 18 cases out of the 20 cases respectively.In all cases a statistically significant difference was found between the two sides.2. For the integral values of masseter muscular activity, in 18 cases of the 20 cases the habitual chewing side had larger values than the non-habitual side, and a statistically significant difference was found between the two sides.3. For the glucose secretion, in 18 cases out of the 20 cases the habitual chewing side had larger values than the non-habitual chewing side, and a statistically significant difference was found between the two sides.4. From these results it was concluded that significant functional differences were found between habitual chewing and non-habitual chewing. Compare to non-habitual chewing habitual chewing had stable movement with stronger forces and higher masticatory efficiency. When quantitatively analyzing mastication chewing side should be taken into consideration. 主咀嚼側咀嚼時と非主咀嚼側咀嚼時との間の機能的差異の有無を検証する目的で, 主咀嚼側を認識している20歳代の正常者20名にグミゼリーを片側ごとに各20秒間咀嚼させた時のEMGリズムを運動機能, 咬筋筋活動の積分値を咀嚼筋筋活動, グルコースの溶出量を咀嚼能率の各指標として, 咀嚼側間で比較した. その結果, 咬筋筋活動の持続時間, 間隔時間, サイクルタイムの各変動係数は, それぞれ主咀嚼側咀嚼時の方が非主咀嚼側咀嚼時よりも小さな値を示し, いずれも咀嚼側間に有意差が認められた. また, 咬筋筋活動の積分値とグルコースの溶出量は, 主咀嚼側咀嚼時の方が非主咀嚼側咀嚼時よりも大きな値を示し, 咀嚼側間に有意差が認められた. これらのことから, 主咀嚼側咀嚼時と非主咀嚼側咀嚼時との間には機能的差異が認められ, 主咀嚼側咀嚼時の方が非主咀嚼側咀嚼時よりも強い力で安定した運動を営み, 高い咀嚼能率を有すること, また咀嚼の定量的分析に際しては咀嚼側に留意すべきことが示唆された.