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

我们与原田电子工业株式会社合作，新开发了超小型无绳肌电测量系统BMS-601(BMS)，使夜间咬肌肌电监测能够以较轻的患者负担进行。为了阐明咬合夹板的疗效，对睡眠磨牙症和颞下颌关节紊乱症患者的夜间肌电进行了检测。BMS-601 BMS的发射单元由电极、放大器、A/D转换器、CPU、电池和发射机组成。将放大的肌电数字数据传输到设置在接收单元中的可拆卸CF卡。BMS在白天的有效性在敲击、最大咬合和咀嚼口香糖的过程中，BMS和传统的测谎系统(PG)记录的EMG都观察到明显的脉冲波。BMS测量的最大咬合的RMS值与PG的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或等于100 cm时，未观察到伪影信号。提示在模拟睡眠转折过程中，BMS测量过程中信号的运动伪影等于或小于PG测量过程中的运动伪影。需要夜间EMGAn非计划时间段来改变接收器天线等结构，以消除夜间意外的线性尖峰状伪影信号。因此，比较夜间肌电数据的受试者数量不足。连续晚上在家中进行夜间肌电测量成为可能，患者组使用夹板和不使用夹板的肌电数据之间的比较变得容易进行。在一些受试者中，使用咬合夹板时夜间肌电爆发减少，而在一些受试者中没有发现明显的变化。尽管这些发现可能与个体之间的差异有关，但人们认为需要对许多科目进行进一步的检查。

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.