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Clin Neurophysiol. 2015 Sep;126(9):1746-53. doi: 10.1016/j.clinph.2014.11.022. Epub 2014 Dec 4.

Jaw tremor as a physiological biomarker of bruxism.

Author information

1
Department of Neurorehabilitation Engineering, Bernstein Focus Neurotechnology Göttingen (BFNT), Bernstein Centre for Computational Neuroscience (BCCN), University Medical Center Göttingen, Georg-August University Göttingen, Germany.
2
Department of Orthobionics, Georg-August University Göttingen, Germany.
3
Department of Biomedical Engineering, Centre for Neuroscience, University of Alberta, Edmonton, Canada.
4
Koç University School of Medicine, Istanbul, Turkey.
5
Department of Neurorehabilitation Engineering, Bernstein Focus Neurotechnology Göttingen (BFNT), Bernstein Centre for Computational Neuroscience (BCCN), University Medical Center Göttingen, Georg-August University Göttingen, Germany. Electronic address: Dario.farina@bccn.uni-goettingen.de.

Abstract

OBJECTIVE:

To determine if sleep bruxism is associated with abnormal physiological tremor of the jaw during a visually-guided bite force control task.

METHODS:

Healthy participants and patients with sleep bruxism were given visual feedback of their bite force and asked to trace triangular target trajectories (duration=20s, peak force <35% maximum voluntary force). Bite force control was quantified in terms of the power spectra of force fluctuations, masseter EMG activity, and force-to-EMG coherence.

RESULTS:

Patients had greater jaw force tremor at ∼8 Hz relative to controls, along with increased masseter EMG activity and force-to-EMG coherence in the same frequency range. Patients also showed lower force-to-EMG coherence at low frequencies (<3 Hz), but greater coherence at high frequencies (20-40 Hz). Finally, patients had greater 6-10 Hz force tremor during periods of descending vs. ascending force, while controls showed no difference in tremor with respect to force dynamics.

CONCLUSION:

Patients with bruxism have abnormal jaw tremor when engaged in a visually-guided bite force task.

SIGNIFICANCE:

Measurement of jaw tremor may aid in the detection/evaluation of bruxism. In light of previous literature, our results also suggest that bruxism is marked by abnormal or mishandled peripheral feedback from the teeth.

KEYWORDS:

Bruxism; Electromyography; Periodontal mechanoreceptors; Physiological tremor

PMID:
25533275
DOI:
10.1016/j.clinph.2014.11.022
[Indexed for MEDLINE]

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