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Quintessence Publishing: Journals: IJP
The International Journal of Prosthodontics

Edited by George A. Zarb, BChD, DDS, MS, MS, FRCD(C)

ISSN 0893-2174

Publication:
November/December 2013
Volume 26 , Issue 6

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Identification of Sleep Bruxism with an Ambulatory Wireless Recording System

Shinji Inano, DDS, PhD/Takahiro Mizumori, DDS, PhD/Yasuyoshi Kobayashi, DDS, PhD/Masakazu Sumiya, DDS, PhD/Hirofumi Yatani, DDS, PhD

Pages: 527-535
PMID: 24179965
DOI: 10.11607/ijp.3331

Purpose: To examine whether an ambulatory bruxism recording system, including a biologic monitor, that measures sleep variables and sympatho-vagal balance can specifically identify sleep bruxism (SB) at home. Materials and Methods: Twentysix volunteers, including 16 SB subjects, were recruited. Each participant recorded his or her electromyogram (EMG), sympatho-vagal balance, and sound level for 3 consecutive nights using an audio-video recorder to identify SB. Data of sleep variables were compared among the 3 experimental nights. The episodes were classified into SB episodes with and without grinding and non-SB episodes. EMG patterns, amplitude, sympatho-vagal balance, and sound level of all episodes were analyzed so as to determine the appropriate thresholds to detect SB episodes and grinding sound. Then, all episodes without video-recording data were classified into SB and non-SB episodes by using the appropriate thresholds, and the sensitivity and specificity to detect SB episodes were calculated. Results: With regard to sleep variables, there were no significant differences except for sleep latency between the first and second nights. The appropriate EMG pattern and thresholds of amplitude, sympatho-vagal balance, and sound level were phasic or mixed EMG pattern, 20% of maximum voluntary contraction, mean + 1 SD, and mean + 2 SDs, respectively. The sensitivity and specificity to detect SB episodes were 88.4% and 74.2%, respectively. Conclusion: The results suggest that this system enables the detection of SB episodes at home with considerably high accuracy and little interference with sleep. Int J Prosthodont 2013;26:527535. doi: 10.11607/ijp.3331

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