1991 Fiscal Year Final Research Report Summary
Bruxism as a causative factor of craniomandibular disorders
| Project/Area Number |
03044176
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| Research Category |
Grant-in-Aid for Overseas Scientific Survey.
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| Allocation Type | Single-year Grants |
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| Research Institution | Tokushima University |
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Principal Investigator |
BANDO Eiichi Tokushima University School of Dentistry, Professor, 歯学部, 教授 (00014168)
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| Co-Investigator(Kenkyū-buntansha) |
ヒューレット エドモンド カリフォルニア大学, ロサンゼルス校・歯学部, 講師
クラーク グレン・トーマ カリフォルニア大学, ロサンゼルス校・歯学部, 教授
NISHIGAWA Keisuke Tokushima University, University Dental Hospital, Research Associate, 歯学部附属病院, 助手 (10202235)
IKEDA Takashi Tokushima University, School of Dentistry, Research Associate, 歯学部, 助手 (30193204)
KONDO Kazuo Tokushima University, School of Dentistry, Research Associate, 歯学部, 助手 (00195893)
NAKANO Masanori Tokushima University, School of Dentistry, Associate Professor, 歯学部, 助教授 (30136262)
HEWLETT Edomond R. The University of California Los Angeles, School of Dentistry, Assistant Profess
CLARK Glenn T. The University of California Los Angeles, School of Dentistry, Professor
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| Project Period (FY) |
1991
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| Keywords | Bruxism / EMG / ECG / Electrical Stimulation / Criteria for a bruxing event |
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| Research Abstract |
The purpose of this project was to establish a highly reliable and reproducible criteria for a bruxing event using masseter EMG activity together with ECG and respiration responses. Masseter was analyzed by converting the raw EMG signal to an RMS signal and the amplitude of this signal was quantified in terms of the subject's 100% maximum voluntary contraction (MVC).
1. A bruxing event was defined by an increase in EMG above baseline and at least 3% of maximum voluntary contraction level. Using this criteria, a mean duration of the RMS converted EMG above the event criteria was 14.3<plus-minus>13.9 seconds and the mean amplitude was 19.2<plus-minus>31.2% of
2. Mean heart rate was shown to be 72.8<plus-minus>12.5 pulses/minute during bruxing events. The mean heart rate during a bruxing event was found to be increased by 18.0<plus-minus>9.2% when compared to the mean heart rate for the period 5 seconds immediately before this ev
The effect of contingent afferent electrical stimulation to the lip was evaluated for sleep associated bruxism. This study used a 4 channel analog tape system to record masseter EMG, ECG, respiration and tooth contact triggered events during sleep in the subject's home for 5 nights.
1. A substantial reduction of total masseter EMG activity was observed in 3 of 5 patients tested, across the 5 night of contingent electrical lip stimulation. There was no remarkable change in the mean duration of each bruxing event.
2. No subject reported awaking during the night because of the lip stimulation.
3. These data, suggest the method may be useful as a therapeutic intervention for more severe bruxers.
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Research Products
(6 results)
