Suppression of nocturnal bruxism by decreasing tongue space

几种腭矫治器的设计已被报道用于治疗颅下颌疾病。然而，这些器具的效果尚未完全阐明。本研究旨在探讨不同设计的上颚矫治器对陡峭运动时咬肌活动的影响。4名志愿者（3女1男，平均年龄36.0岁）参与本研究。对于每个受试者，使用四种不同类型的腭矫治器。上颌矫治器为1)马蹄形矫治器（厚度1mm）， 2)覆盖整个上颌的薄矫治器（厚度1mm）， 3)填充腭凹的厚矫治器，4)第三个矫治器的一半厚度的矫治器。这些矫治器按随机顺序佩戴一周，每个矫治器之间间隔一周。每周有三个晚上在家记录右咬肌肌电图。长于0.25秒的肌电信号为猝发，短于0.25秒的肌电信号为片段性肌阵挛（FW）短暂猝发。基线、1、2、3、4组平均每小时爆发次数分别为7.99±7.32次、3.52±1.95次、5.90±3.99次、2.87±2.87次和9.96±6.02次。平均每小时FM数分别为136.86±69.88、90.53±41.19、99.49±39.29、71.66±24.66和144.39±42.97。结果表明，厚腭矫治器对睡眠时咬肌活动的抑制效果最好。

Several designs of palatal appliance have been reported for the treatment of craniomandibular disorders. However, the effect of these appliances has not yet been fully clarified. This study aimed to reveal the effect of palatal appliances of different design on masseter muscle activity during steep.Four volunteers(3 women and 1 man, mean age 36.0 years)were used in this study. For each subject, four different types of palatal appliances were used. The palatal appliances were 1)horse shoe type(1mm thick), 2)thin appliance which covered the whole palate(1mm thick), 3)thick appliance which filled the palatal concavity, and 4)appliance with the half thickness of the third appliance.These appliances were worn for one week for each in a randomized sequence with 1 week interval between each appliance. Right masseter muscle EMG was recorded three nights per week at home. EMG signal longer than 0.25 sec was classified as a burst and a signal shorter than 0.25 sec was classified as a brief burst of fragmentary myoclonus(FW). Mean number of burst per hour for four subjects were 7.99±7.32, 3.52±1.95, 5.90±3.99, 2.87±2.87 and 9.96±6.02 for base line, appliance 1, 2, 3 and 4, respectively. Mean number of FM per hour were 136.86±69.88, 90.53±41.19, 99.49±39.29, 71.66±24.66 and 144.39±42.97, respectively. From these results, it was suggested that thick palatal appliance suppressed the masseter muscle activity during sleep most effectively.