Deregibus Andrea, Castroflorio Tommaso, Bargellini Andrea, Debernardi Cesare
Department of Surgical Sciences, Specialization School of Orthodontics, Dental School, University of Torino, Via Nizza 230, 10100, Torino, Italy.
Clin Oral Investig. 2014 Nov;18(8):2037-43. doi: 10.1007/s00784-013-1168-z. Epub 2013 Dec 28.
The aim of the study was to assess the repeatability in detecting sleep bruxism (SB) episodes by combined surface electromyography and heart rate (HR) signals recorded by a compact portable device (Bruxoff®). SB episodes are preceded by a sudden HR change. Thus, HR detection increases the precision of automatic detection of SB.
Ten healthy subjects (five women and five men; 30.2 ± 11.02 years) were selected for the study. Rhythmic masseter muscle activities, constituting the basic pattern of SB, were detected during three nights of recording during three different weeks with the Bruxoff device.
The two-way ANOVA was not significant for SB episodes per night, SB episodes per hour, and heart frequency: no significant differences were observed during the three different nights of recording for each of the abovementioned variables (P > 0.05). The intraclass correlation coefficient showed a good reproducibility for SB episodes per night (69 %), SB per hour (74 %), and heart frequency (82 %). A poor reproducibility was revealed for the number of masseter contractions (53 %). The Pearson analysis showed the absence of a significant correlation between the number of masseter contractions per night and the number of SB episodes per night (r = -0.02, P = 0.91).
The Bruxoff device showed a good reproducibility of measurements of sleep bruxism episodes over time.
These findings are important in the light of the need for simple and reliable portable devices for the diagnosis of SB both in the clinical and research settings.
本研究旨在评估使用紧凑型便携式设备（Bruxoff®）记录的表面肌电图和心率（HR）信号联合检测睡眠磨牙（SB）发作的可重复性。SB发作之前会有心率突然变化。因此，心率检测提高了SB自动检测的精度。
选择10名健康受试者（5名女性和5名男性；30.2±11.02岁）进行研究。在三个不同的星期里，使用Bruxoff设备在三个晚上的记录过程中检测构成SB基本模式的节律性咬肌活动。
对于每晚的SB发作次数、每小时的SB发作次数和心率，双向方差分析无显著性差异：在上述每个变量的三个不同晚上的记录过程中未观察到显著差异（P>0.05）。组内相关系数显示每晚SB发作次数（69%）、每小时SB发作次数（74%）和心率（82%）具有良好的可重复性。咬肌收缩次数的可重复性较差（53%）。Pearson分析显示每晚咬肌收缩次数与每晚SB发作次数之间无显著相关性（r = -0.02，P = 0.91）。
Bruxoff设备显示出随时间推移对睡眠磨牙发作测量的良好可重复性。
鉴于在临床和研究环境中都需要简单可靠的便携式设备来诊断SB，这些发现具有重要意义。
