Examination of efficacy of occlusal splints by means of a newly developed ultraminiature cordless EMG measurement system

我们最近与原田电子工业有限公司合作开发了一种超微型无绳肌电测量系统BMS-601 (BMS)，可以在减轻患者负担的情况下监测咬肌夜间肌电。为了阐明咬合夹板的疗效，我们检查了睡眠磨牙和颞下颌障碍患者的夜间肌电图。BMS-601 BMS的发射机单元包括电极、放大器、A/D转换器、CPU、电池和发射机。放大的肌电数字数据传输到接收单元2中的可移动CF卡组。BMS在白天的有效性——在敲击、最大握紧和嚼口香糖时，BMS和常规测谎系统（PG）记录的肌电图中观察到明显的脉冲。BMS与PG测定的最大咬合RMS值呈显著的线性相关。当发射器和接收器之间的距离小于等于100cm时，没有观察到伪信号。结果表明，在模拟睡眠转时，BMS测量信号的运动伪影等于或小于PG测量信号的运动伪影。夜间EMGAn需要在非计划期间改变接收器天线等结构，以消除夜间意想不到的线路尖峰形伪信号。因此，比较夜间肌电图数据的受试者数量不够。在家中连续夜间进行肌电图测量成为可能，并且对患者组进行有夹板和没有夹板的肌电图数据的比较变得容易。在一些受试者中，使用咬合夹板时夜间肌电图爆发减少，而在一些受试者中没有发现明显的变化。尽管个体之间的差异可能与这些发现有关，但人们认为需要对许多受试者进行进一步的检查。

We newly developed an ultraminiature cordless EMG measurement system, BMS-601 (BMS), in cooperation with Harada Electronic Industry Ltd. to enable the monitoring of nocturnal EMG of the masseter muscles to be performed with less burden of patients. To elucidate the efficacy of occlusal splints, nocturnal EMG of patients with sleep bruxism and temporomandibular disorders were examined.1. BMS-601The transmitter unit of BMS contains electrodes, an amplifier, A/D converter, a CPU, a battery and a transmitter. Amplified EMG digital data are transmitted to a removable CF card set in the receiver unit.2. Validity of BMS in the daytimeDuring tapping, maximum clenching and gum-chewing, distinct bursts were observed in EMG recorded by BMS as well as a conventional polygraph system (PG). RMS values of maximum clenching measured by BMS and PG showed a linear and significant correlation. When distance between the transmitter and receiver unit was 100 cm or less, no artifact signal was observed. It was suggested that the motion artifact of signals during BMS measurements is equal to or less than that during PG measurements during simulated sleep turn.3. Nocturnal EMGAn unplanned period was needed for alterations of structures such as the receiver antenna to eliminate unexpected liner-spike-shape artifact signals at the night time. Therefore, the number of the subjects whose nocturnal EMG data were compared was not sufficient. Nocturnal EMG measurements in successive nights at home became possible and the comparison between the EMG data with and without the splint became easy to be performed for the patient group. In some subjects, the nocturnal EMG bursts decreased when using occlusal splints, while no distinct change was found in some subjects. Though the difference among individuals was possibly involved in these findings, further examinations of many subjects are thought to be needed.