Kishimoto Takahiro, Goto Takaharu, Ichikawa Tetsuo
Department of Comprehensive Dentistry, Graduate School of Biomedical Sciences, Tokushima University, Tokushima 770-8504, Japan.
Department of Prosthodontics and Oral Rehabilitation, Graduate School of Biomedical Sciences, Tokushima University, Tokushima 770-8504, Japan.
Brain Sci. 2022 Dec 14;12(12):1711. doi: 10.3390/brainsci12121711.
The purpose of this study was to explore the influence of simple jaw opening and closing task of chewing movements on the activities of the prefrontal cortex (PFC) from the viewpoint of stress reduction. We measured cerebral blood flow (CBF) in the PFC during a block-tapping task of the jaw in healthy participants. Eleven young healthy individuals with normal dentition (7 males and 4 females, mean age 28.0 ± 3.7 years) volunteered for this study. CBF was measured using a wearable, functional near-infrared spectroscopy device. Measurements were taken using the central incisors and first molars at interocclusal distances of 5 and 10 mm. The participants were asked to bite a hard/soft block. CBF in all conditions showed limited variability or decreasing trend compared to resting state before the task. The main effect was observed for interocclusal distance ( = 0.008), and there were no significant differences for measurement area of the PFC, tooth type, and material type. An interaction was found between tooth type and material type. In conclusion, these results suggest that simple and rhythmical chewing motion has an effect of reducing CBF in the PFC and resting the PFC, which is an especially notable aspect of periodontal sensory information in the molar.
本研究的目的是从减轻压力的角度探讨咀嚼运动中简单的张闭口任务对前额叶皮质（PFC）活动的影响。我们测量了健康参与者在进行下颌敲击任务时PFC的脑血流量（CBF）。11名牙列正常的年轻健康个体（7名男性和4名女性，平均年龄28.0±3.7岁）自愿参与本研究。使用可穿戴的功能近红外光谱设备测量CBF。在5毫米和10毫米的咬合距离下，使用中切牙和第一磨牙进行测量。要求参与者咬硬/软块。与任务前的静息状态相比，所有条件下的CBF均显示出有限的变异性或下降趋势。观察到咬合距离的主要效应（=0.008），PFC的测量区域、牙齿类型和材料类型均无显著差异。发现牙齿类型和材料类型之间存在交互作用。总之，这些结果表明，简单而有节奏的咀嚼运动具有降低PFC中CBF并使PFC得到休息的作用，这是磨牙中牙周感觉信息的一个特别显著的方面。
