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Oral appliances reduce masticatory muscle activity-sleep bruxism metrics independently of changes in heart rate variability

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Abstract

Objectives

Sleep bruxism (SB) is associated with physiological activities including sympathetic autonomic system dominance and sleep micro-arousal. While oral appliances (OA) are used to prevent SB harmful effects, the influence of OAs physiological mechanisms during sleep is unknown. The aim of this study is to assess whether heart rate variability (HRV) changes, as a marker of autonomic nervous system activity, would be associated with the OA mechanism of action on SB using occlusal splint (OS) and mandibular advancement splint (MAS).

Materials and methods

A retrospective analysis, from data previously collected in 21 participants with SB (25.6 ± 4.5 years) with polysomnographic recordings, was done. HRV data were compared between a reference night (no-device) and ones during which OS or MAS was used in a crossover study design. Rhythmic masticatory muscle activity (RMMA) index was compared between nights. HRV was evaluated using autoregressive model analysis for three sections: baseline (distance from RMMA), immediately before, and after RMMA period.

Results

A significant reduction in RMMA index, when wearing OA during sleep, was observed (P < 0.01), but was not associated with HRV parameters change. HRV significantly changed after RMMA onset for nights with OA during non-REM sleep in comparison with baseline (P < 0.02).

Conclusions

The usage of OAs for SB participants reduced RMMA, but most likely independently of changes in HRV linked to the mechanism associated with SB genesis.

Clinical relevance

Wearing OA seems to reduce grinding noise and protect from dental injuries but does not seem to influence SB genesis.

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Acknowledgements

The authors would like to thank Keigo Miyata and Yusuke Kameoka in Chest Co. for their support of RemLogic software in the study. This paper was based on data from sleep studies supported by the Canadian Institutes of Health Research (CIHR) and the Fonds de la Recherche en Santé du Québec (FRSQ) grants to G. Lavigne who holds a Canada Research Chair in Pain, Sleep and Trauma. Susumu Abe was a visiting scholar from Tokushima University Graduate School, Tokushima, Japan, during his stay in Montreal, Canada. Recognition to Margaret Mckyes and Joshua Wolfe for English editing.

Funding

This paper was based on data from sleep studies supported by the Canadian Institutes of Health Research (CIHR) and the Fonds de la Recherche en Santé du Québec (FRSQ) grants to G. Lavigne who holds a Canada Research Chair in Pain, Sleep and Trauma.

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Correspondence to Susumu Abe.

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Pierre de Grandmont is deceased.

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Abe, S., Huynh, N.T., Kato, T. et al. Oral appliances reduce masticatory muscle activity-sleep bruxism metrics independently of changes in heart rate variability. Clin Oral Invest 26, 5653–5662 (2022). https://doi.org/10.1007/s00784-022-04520-y

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