title: Determination of daytime clenching events in subjects with and without self-reported clenching.
abstract: To confirm the validity of self-awareness of daytime clenching, specific electromyogram (EMG) characteristics of clenching behaviour were determined using surface EMG recordings. Temporal muscle EMGs were recorded for 5 h in 13 subjects with self-reported clenching (clenching group: 27·5 ± 3·8 years old) and 12 subjects without self-reported clenching (control group: 28·6 ± 7·1 years old). All EMG data were recorded and stored on a portable EMG apparatus. The device was similar in size to a hearing aid, and suitable to record daytime EMG without restriction of daily activities. A clenching event was defined as muscle activity exceeding 10% of the maximum voluntary contraction. Furthermore, simultaneous voice recording was also performed to identify the corresponding EMG event as functional or parafunctional. The mean number of clenching events was 192·8 ± 228·8 and 24·8 ± 26·5 in the clenching and the control groups, respectively (P < 0·05, Mann-Whitney U-test); the number of functional events was not significantly different between the groups. Because there was a significant difference in the number of clenching events between the groups, self-reported daytime clenching is considered to be a reliable screening parameter for awake bruxism.
authors.affiliation: Division of Fixed Prosthodontics, Department of Restorative & Biomaterials Sciences, School of Dentistry, Meikai University, Sakado, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Fujisawa
authors.forename: K
authors.initials: K
authors.lastname: Kanemura
authors.forename: N
authors.initials: N
authors.lastname: Tanabe
authors.forename: Y
authors.initials: Y
authors.lastname: Gohdo
authors.forename: A
authors.initials: A
authors.lastname: Watanabe
authors.forename: T
authors.initials: T
authors.lastname: Iizuka
authors.forename: M
authors.initials: M
authors.lastname: Sato
authors.forename: K
authors.initials: K
authors.lastname: Ishibashi
mesh_terms: D000328:Adult; D001364:Awareness; D002012:Bruxism / Q000175:diagnosis*; D016022:Case-Control Studies; D004576:Electromyography; D005260:Female; D006801:Humans; D008297:Male; D018670:Monitoring, Ambulatory / Q000379:methods; D009119:Muscle Contraction / Q000502:physiology; D015203:Reproducibility of Results; D057566:Self Report / Q000592:standards*; D013703:Temporal Muscle / Q000502:physiology*; D055815:Young Adult
keywords: ambulatory recording; bruxism; clenching awareness; daytime clenching; electromyogram; temporo-mandibular disorders