An ambulatory bruxism recording system with sleep-stage analyzing function

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  • Mizumori Takahiro
    Department of Fixed Prosthodontics, Osaka University Graduate School of Dentistry
  • Inano Shinji
    Department of Fixed Prosthodontics, Osaka University Graduate School of Dentistry
  • Sumiya Masakazu
    Department of Fixed Prosthodontics, Osaka University Graduate School of Dentistry
  • Kobayashi Yasuyoshi
    Department of Fixed Prosthodontics, Osaka University Graduate School of Dentistry
  • Watamoto Takao
    Department of Fixed Prosthodontics, Osaka University Graduate School of Dentistry
  • Yatani Hirofumi
    Department of Fixed Prosthodontics, Osaka University Graduate School of Dentistry

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Abstract

Purpose: The aim of this study was to develop an ambulatory bruxism recording system capable of sleep-stage analysis. <BR>Methods: A portable EMG system was used to record masseter muscle activity. An EMG sensor was attached onto the masseter muscle belly at either side. EMG data were stored on a notebook type personal computer. A sound level meter was used to assess the sound level of bruxism. Sound level (dB) readings were taken every second and recorded on the same computer. A prototype of sleep sensor, a wristwatch-style biological signal sensor-recorder device, recorded and stored pulse wave, acceleration and temperature on a memory card. All stored data were transferred to a personal computer and analyzed. <BR>Results: The whole system was transportable within a protective case and weighed approximately 5 kg. Raw EMG signals were processed to derive integrated EMG data. TOSHIBA Sleep Analysis Program classified sleep-stages as awake, shallow sleep, deep sleep and REM based on the activity of the autonomic nervous system that was estimated from the fluctuations of pulse intervals. An EMG, sound level and sleep-stage analysis program was developed to analyze all data simultaneously. Using this program, the masseter muscle activity, sound level and sleep-stage could be quantified and correlated. <BR>Conclusion: We developed an ambulatory bruxism recording system that analyzes sleep-stage. We expect that this system will enable us to measure sleep bruxism activity in each sleep-stage on an electromyographical and auditory basis at the subject's home.

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