Ueda H M, Tabe H, Kato M, Nagaoka K, Nakashima Y, Shikata N, Tanne K
Department of Orthodontics, Hiroshima University, Faculty of Dentistry, Hiroshima, Japan.
J Oral Rehabil. 2003 Oct;30(10):1030-5. doi: 10.1046/j.1365-2842.2003.01167.x.
The purpose of this study was to investigate masticatory muscle activity with and without the use of an activator during daytime and sleep, and further to focus on the changes in muscle activity produced by the daytime use. The subjects in this study were 10 healthy males (mean age: 27.6 years). A portable electromyogram (EMG) recording device was used to record the activity from the right temporal, masseter and digastric muscles. After recording, the integrated EMG values (microV s) were measured. The muscle activity was lower during sleep than during daytime, irrespective of the use of the activator. In sleep-time, temporal and digastric muscle activity was significantly decreased, although masseter muscle activity presented no significant differences. With the activator in use, the digastric muscle activity tended to increase in comparison with the elevator muscles during daytime and sleep. Although the activity of both elevator muscles was diminished by use of the activator during sleep in all subjects, some subjects showed an increase during daytime. These results suggested that the activator should be used, if possible, not only during sleep, but also during daytime and clenched on consciously to obtain the adaptation and development of the masticatory muscles for the 're-training of the muscles' at a new favourable mandibular position.
本研究的目的是调查在白天和睡眠期间使用和不使用矫治器时咀嚼肌的活动情况，并进一步关注白天使用矫治器所产生的肌肉活动变化。本研究的受试者为10名健康男性（平均年龄：27.6岁）。使用便携式肌电图（EMG）记录设备记录右侧颞肌、咬肌和二腹肌的活动。记录后，测量肌电图积分值（微伏秒）。无论是否使用矫治器，睡眠期间的肌肉活动均低于白天。在睡眠时间，颞肌和二腹肌的活动显著降低，尽管咬肌活动没有显著差异。使用矫治器时，与升肌相比，白天和睡眠期间二腹肌的活动有增加的趋势。虽然在睡眠期间所有受试者使用矫治器后升肌的活动均减弱，但一些受试者在白天出现活动增加。这些结果表明，如果可能的话，矫治器不仅应在睡眠期间使用，还应在白天有意识地咬紧使用，以在新的有利下颌位置获得咀嚼肌的适应性和发育，从而实现“肌肉再训练”。
