Journal of Japanese Society for Mastication Science and Health Promotion
Online ISSN : 1884-4448
Print ISSN : 0917-8090
ISSN-L : 0917-8090
Functional differences between chewing on habitual chewing side and chewing on non-habitual chewing side
Masticatory movement function, masticatory muscular activity, and masticatory efficiency when chewing gumi-jelly
Jun TOCHIKURAHiroshi SHIGAYoshinori KOBAYASHI
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JOURNAL FREE ACCESS

2000 Volume 9 Issue 2 Pages 57-64

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Abstract

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.

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