Suppression of nocturnal bruxism by decreasing tongue space

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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.