透明保持器对颞肌、咬肌肌电影响的分析研究

Influence of clear thermoplastic retainer on the electromyography of temporalis muscle and masseter muscle

透明保持器是目前正畸治疗中所普遍采用的保持装置之一,然而关于透明保持器对颞肌、咬肌肌电变化影响的研究却很少见。本研究的目的是观察透明保持器戴入前后不同状态下颞肌、咬肌肌电的改变情况。根据筛选标准选择健康受试者,记录透明保持器戴入前后不同状态下颞肌、咬肌的肌电值进行统计分析。结果显示透明保持器戴入后下颌休息位及发[s]、[z]时颞肌、咬肌的肌电值均较未戴前明显增高,发[a]时则无显著性差异。

Clear thermoplastic retainer is one of the most commonly used retention devices in orthodontics. However, studies about the electromyography （EMG） of temporalis muscle（TM） and masseter muscle（MM） in people with clear thermoplastic retainer are few. The purpose of this study was to observe the influence of clear thermoplastic retainer on the EMG of TM and MM in mandible posture position （MPP）, speaking [s], [z] and [a]. Choose people according to the standards, decide the situation by preliminary experiment. The EMG of TM, MM was studied before and after clear thermoplastic retainer was worn. Variance analysis was used to evaluate the differences. The results revealed that the EMG activity of TM,MM, viewed in MPP and when people said [ s], [ z], was higher after clear thermoplastic retainer was worn. When people said [ a] , there was no significant difference.