Minami Ichiro, Akhter Rahena, Luraschi Julien, Oogai Kazuhiro, Nemoto Tetsu, Peck Christopher C, Murray Gregory M
Jaw Function and Orofacial Pain Research Unit, Faculty of Dentistry, University of Sydney, NSW, Australia.
Eur J Oral Sci. 2012 Jun;120(3):195-200. doi: 10.1111/j.1600-0722.2012.00963.x.
A major goal of motor coordination is the production of a smooth movement. Jerk-cost, which is an inverse measure of movement smoothness, has been evaluated during gum chewing in previous studies. However, the effect of the gum bolus is still unclear. The aims of this study were to compare the jerk-cost values of normal gum chewing with those of empty chewing. Thirteen subjects undertook, empty chewing, then chewing of gum, and then a second empty chewing. Jerk-cost was calculated from an accelerometer attached to the skin of the mentum. There was a significantly higher smoothness (i.e. lower jerk-cost, P < 0.05) during the opening and second-half closing phases in empty chewing compared with gum chewing. There were no significant differences in jerk-costs (i.e. opening or closing) between the first and the second empty-chewing sequences. These results suggest that the influence of the mechanical effects of tooth contact on jerk-cost is not restricted just to the occlusal phase of chewing, but rather the effect influences the entire opening and closing phases of chewing.
运动协调的一个主要目标是产生平稳的动作。急动成本是运动平稳性的一种反向度量，在先前的研究中已在咀嚼口香糖时进行了评估。然而，口香糖团块的影响仍不清楚。本研究的目的是比较正常咀嚼口香糖与空嚼时的急动成本值。13名受试者先进行空嚼，然后咀嚼口香糖，接着再进行一次空嚼。通过附着在颏部皮肤的加速度计计算急动成本。与咀嚼口香糖相比，空嚼时在开口和后半程闭口阶段的平稳性显著更高（即急动成本更低，P < 0.05）。第一次和第二次空嚼序列之间的急动成本（即开口或闭口）没有显著差异。这些结果表明，牙齿接触的机械效应对应急动成本的影响不仅局限于咀嚼的咬合阶段，而是这种影响贯穿于咀嚼的整个开口和闭口阶段。
