Sugimoto Koichi, Yoshimi Hidehiro, Sasaguri Kenichi, Sato Sadao
Kanagawa Dental College, Kanagawa, Japan.
Cranio. 2011 Apr;29(2):127-37. doi: 10.1179/crn.2011.021.
The biomechanical load during strong bruxism activity reportedly causes many dental/oral problems. However, it is unknown whether the magnitude of muscle activity during sleep is controllable. In this study, the relationship between the magnitude of muscle activity during sleep and types of tooth contacts was examined, including anterior and posterior guidance, in order to clarify how occlusion factors contribute to sleep bruxism (SB). An EMG-2-axis accelerometer system was used for monitoring patterns and activities of SB. Bruxchecker was used to evaluate tooth contacts during SB, and a condylograph was used to measure posterior guidance (sagittal condylar inclination). Results show that grinding rather than clenching or tapping was observed in the high SB group, and there was Incisor-Canine-Premolar-Molar (ICPM) tooth contact during SB grinding movement. The canine occlusal guidance (COG) was flatter in the low SB group than in the moderate SB group. Relative canine occlusal guidance (rCOG), which is the difference between the sagittal condylar inclination (SCI) and COG, was larger in the low SB group than that in the high SB group. These findings suggest that the grinding pattern must be controlled to prevent strong bruxism, and that the muscle activity during bruxism can be reduced by controlling the tooth contact pattern during SB grinding.
据报道，强烈磨牙活动期间的生物力学负荷会引发许多牙齿/口腔问题。然而，睡眠期间肌肉活动的强度是否可控尚不清楚。在本研究中，研究了睡眠期间肌肉活动强度与牙齿接触类型之间的关系，包括前导和后导，以阐明咬合因素如何导致睡眠磨牙症（SB）。使用肌电图 - 双轴加速度计系统监测SB的模式和活动。使用磨牙症检查仪评估SB期间的牙齿接触情况，并使用髁突描记仪测量后导（矢状髁突倾斜度）。结果表明，在高SB组中观察到的是磨牙而不是紧咬或轻敲，并且在SB磨牙运动期间存在切牙 - 尖牙 - 前磨牙 - 磨牙（ICPM）牙齿接触。低SB组的尖牙咬合导平面（COG）比中度SB组更平坦。相对尖牙咬合导平面（rCOG），即矢状髁突倾斜度（SCI）与COG之间的差值，在低SB组中比高SB组更大。这些发现表明，必须控制磨牙模式以预防强烈的磨牙症，并且通过控制SB磨牙期间的牙齿接触模式可以降低磨牙症期间的肌肉活动。
