Department of Oral Biomedical Science, Faculty of Dentistry, Khon Kaen University, Khon Kaen, Thailand.
Neuroscience Research and Development Group, Khon Kaen University, Khon Kaen, Thailand.
J Oral Rehabil. 2020 Jun;47(6):731-735. doi: 10.1111/joor.12961. Epub 2020 Mar 20.
Biting food too quickly might affect the control of jaw-closing muscles and the estimation of bite force. The objectives of this study were to compare the incisal bite forces used to cut food and the activity of masseter (MA) and anterior temporalis (AT) muscles between slow, habitual and fast biting speeds and also between small and large jaw openings. Twenty subjects were asked to use their incisors to cut through a 5 mm thick of chewing gum. In the first experiment, subjects bit at 10-mm incisal separation with slow, habitual and fast biting speeds, and in the second experiment, subjects bit with their habitual speed at 10- and 30-mm incisal separations. The activities in the MA and AT muscles were assessed with surface electromyography, and the bite force was recorded by a force sensor placed beneath the chewing gum. Peak bite forces and associated MA amplitudes were increased significantly as biting speed was increased (P's < .05). Anterior temporalis amplitude was significantly increased during fast biting compared to slow and habitual biting (P's < .001). At 30-mm incisal separation, both peak bite force and AT amplitude were significantly increased, whereas MA amplitude was significantly decreased, compared to those at 10-mm separation (P's < .05). Biting off food quickly with incisor teeth results in larger activities in both MA and AT muscles. In addition, biting a large piece of food resulted in increased activity of AT muscle. Both conditions could be injury stimulator for jaw muscles.
快速咬食物可能会影响咀嚼肌的闭合控制和咬合力的估计。本研究的目的是比较慢速、习惯性和快速咀嚼速度以及小开口和大开口之间用于切割食物的切牙咬合力和咀嚼肌（MA）和前颞肌（AT）肌肉的活动。要求 20 名受试者用切牙将 5 毫米厚的口香糖切断。在第一个实验中，受试者以 10 毫米的切牙分离以慢速、习惯性和快速咀嚼速度咀嚼，在第二个实验中，受试者以习惯性速度以 10 和 30 毫米的切牙分离咀嚼。通过表面肌电图评估 MA 和 AT 肌肉的活动，通过置于口香糖下方的力传感器记录咬合力。随着咀嚼速度的增加，最大咬合力和相关的 MA 幅度显著增加（P 值均<.05）。与慢速和习惯性咀嚼相比，快速咀嚼时 AT 幅度明显增加（P 值均<.001）。与 10 毫米切牙分离相比，30 毫米切牙分离时最大咬合力和 AT 幅度显著增加，而 MA 幅度显著降低（P 值均<.05）。用切牙快速咬碎食物会导致 MA 和 AT 肌肉的活动增加。此外，咀嚼大块食物会导致 AT 肌肉活动增加。这两种情况都可能是咀嚼肌受伤的刺激因素。
