ID 112028
Author
Omoto, Katsuhiro Tokushima University
Keywords
Sleep bruxism
Mandibular movement
Tooth grinding
Masseter muscle activity
Canine attrition
Content Type
Journal Article
Description
Patient: Observation of attrition patterns suggests that mandibular movement in sleep bruxism (SB) may be associated with current tooth attrition. The aim of this study was to confirm this phenomenon by investigating mandibular movement and masseter muscle activity. The subject was a healthy 21-year-old Japanese male. We recorded biological signals including mandibular movement and masseter electromyograms (EMGs) with a polysomnograph. Based on the EMG using Okura’s criteria, SB events were classified into clenching, grinding and mixed types according to mandibular movement criteria. The close-open mandibular movement cycles (CO-cycles) during grinding and mixed type events were selected based on mandibular movement trajectories. Discussion: Fifty-eight CO-cycles were selected in seven grinding and three mixed types. We found that SB mandibular movements associated with current tooth attrition. Excessive lateral movements (ELM) beyond the canine edge-to-edge position were observed in the closing (10.3%) and opening (13.8%) phases of the CO-cycle. Total masseter muscle activity was significantly higher during voluntary grinding (VGR) than during CO-cycle including ELM (working side: P = 0.036, balancing side: P = 0.025). However, in the middle and late parts of the opening phase, working side masseter muscle activity was significantly higher during CO-cycle including ELM than during VGR (P = 0.012). In the early part of the closing phase, balancing side masseter muscle activity was significantly higher during CO-cycle including ELM than during VGR (P = 0.017). Conclusion: These findings suggest that excessive forceful grinding during ongoing SB events may have caused canine attrition in this patient.
Journal Title
Journal of Prosthodontic Research
ISSN
18831958
18839207
NCID
AA12395171
Publisher
The Japan Prosthodontic Society
Volume
61
Issue
1
Start Page
87
End Page
95
Published Date
2016-06-25
Rights
© 2016. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/.
EDB ID
DOI (Published Version)
URL ( Publisher's Version )
FullText File
language
eng
TextVersion
Author
departments
University Hospital
Oral Sciences