Department of Crown and Bridge Prosthodontics, Faculty of Dental Medicine, Hokkaido University, Sapporo, Japan.
Division of Aging and Geriatric Dentistry, Department of Oral Function and Morphology, Tohoku University Graduate School of Dentistry, Sendai, Japan.
J Prosthodont Res. 2024 Jul 8;68(3):456-465. doi: 10.2186/jpr.JPR_D_23_00072. Epub 2024 Jan 12.
This study aimed to elucidate the relationship between diurnal masseter muscle activity and awareness of diurnal awake bruxism (d-AB) by conducting a comparative analysis of electromyographic (EMG) data from individuals with and without awareness of diurnal awake bruxism (d-AB), utilizing EMG data gathered from multiple subjects.
Unilateral masseter electromyography (EMG) recordings were performed during the daytime using an ultraminiature wearable EMG device. A total of 119 participants (59 with awareness of diurnal tooth clenching [d-TC] and 60 without awareness of d-TC) were included. Waveforms longer than 0.25 s with the two amplitude conditions, exceeding twice the baseline and >5% of maximum voluntary clenching, were extracted. In addition, the number of bursts and episodes (groups of bursts), burst duration, and burst peak amplitude were calculated for each participant.
There were no significant differences in the EMG parameters between the groups with and without awareness of d-TC. Additionally, the frequency distribution of the number of EMG waveforms exhibited wide ranges and substantial overlap between the two groups.
The variability in the number of bursts and episodes, burst peak amplitude, and burst duration among subjects suggests the need for an objective classification of d-AB severity based on EMG values. The absence of significant differences and large overlap in frequency distributions between the groups with and without awareness of d-TC indicate difficulty in predicting muscle activity solely based on awareness of d-AB.
本研究旨在通过对有和无日间觉醒磨牙症（d-AB）意识的个体的肌电图（EMG）数据进行比较分析，阐明日间咬肌肌肉活动与日间觉醒磨牙症（d-AB）意识之间的关系，利用从多个受试者收集的 EMG 数据。
使用超微型可穿戴 EMG 设备在白天进行单侧咬肌肌电图（EMG）记录。共纳入 119 名参与者（59 名有日间磨牙意识 [d-TC]，60 名无日间磨牙意识 [d-TC]）。提取持续时间超过 0.25 s 的两个幅度条件的波形，超过基线的两倍且>5%的最大自主咬牙。此外，为每个参与者计算了爆发和发作的次数（爆发组）、爆发持续时间和爆发峰值幅度。
有和无 d-TC 意识的组之间的 EMG 参数没有显著差异。此外，两组之间的 EMG 波形数量的频率分布表现出广泛的范围和大量重叠。
由于个体之间爆发次数和发作、爆发峰值幅度和爆发持续时间的可变性，需要基于 EMG 值对 d-AB 的严重程度进行客观分类。有和无 d-TC 意识的组之间的差异不显著且频率分布有很大重叠，表明仅根据 d-AB 意识预测肌肉活动存在困难。
