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Evaluation of Rhythmic Masseter Muscle Activity during Sleep and Awake in Patients with Dentofacial Deformity

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Abstract

Objectives

Investigate the activity of rhythmic masseter muscles activity (RMMA) during sleep in patients with dentofacial deformities.

Materials and methods

Fifty patients with dentofacial deformities (16 male, 34 female) who required orthognathic surgery. An electrode was attached to the masseter muscle bilaterally, and preoperative polysomnography was performed. The frequency of RMMA onset per hour was measured on the left and the right sides. Values were classified as phasic (grinding: P-RMMA) and tonic (clenching: T-RMMA) to examine the onset of RMMA. Correlation between the RMMA index and various morphological and physical factors were determined including sleep or awake, rapid eye movement (REM), non-rapid eye movement (NREM) phases (NR1-NR4) in the sleep stage, phasic and tonic, gender, and mandibular asymmetry.

Results

The RMMA index values at the time of sleep were significantly small than during awake. The values were significantly higher during the NREM sleep than during the REM sleep and were the highest in the NR1 phase. P-RMMA index was significantly higher than the T-RMMA index. The P-RMMA index was also significantly higher than the T-RMMA index for men. In patients with greater asymmetry in the RMMA index values between the left and the right side (more than 30% difference), deviation between the midpoint of the maxillary and the mandibular incisal edges (U1-L1 deviation) was significantly higher.

Conclusion

RMMA in patients with dentofacial deformity was statistically higher in awake than sleep, higher in NREM sleep than REM sleep, higher in male than female on grinding, and higher in upper and lower incisor high deviation.

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Authors and Affiliations

Authors

Contributions

Y. F. and K. O. designed most of the experiments and wrote the main manuscript text and prepared all figures and tables. R. J. and S. T. are the primary person responsible for carrying out all experimental procedures. M. M. and Y. N. analyzed the data. K. K. and S. T. are the person who made the final approval of the article.

Corresponding author

Correspondence to Kazuhiro Ooi.

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Conflict of interest

The author declare that they have no conflict of interest.

Ethical Approval

This study was approved by Kanazawa University Hospital Research Ethical Committee (Ref. No. 1765-1).

Informed Consent

All patients were informed about the research purpose and agreed to use their clinical data for this study.

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Futani, Y., Ooi, K., Jokaji, R. et al. Evaluation of Rhythmic Masseter Muscle Activity during Sleep and Awake in Patients with Dentofacial Deformity. J. Maxillofac. Oral Surg. 21, 481–486 (2022). https://doi.org/10.1007/s12663-020-01467-z

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  • DOI: https://doi.org/10.1007/s12663-020-01467-z

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