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Zahnheilkunde 1. Jänner 1970

Sleep bruxism needs deep sleep stages and seems to reduce psychological stress

Purpose Sleep bruxism (SB) is a potential risk factor
for dental treatment but the etiology has not been
well characterized. This article focuses on the relationships
between sleep parameters from polysomnography
(PSG), electromyography (EMG) and psychological
stress biomarker levels.
Materials and methods The subjects, nine males and
five females, were generally healthy volunteers with the
possibility of having SB. Data from PSG and EMG were
collected in a stimulus-controlled sleep laboratory and
SB occurrence was identified using EMG of the masseter
muscles. Blood samples were collected before and after
sleep to measure the psychological stress biomarkers
chromogranin A (CgA) and cortisol and melatonin. The
relationships among parameters were statistically analyzed
by the Kendall Tau correlation coefficient.
Results A positive correlation between SB and deep
sleep stages (stages 3 and 4) was observed (p < 0.01). In
addition, deep sleep stages had significant effects on
changes in CgA levels.
Conclusion In this study it was found that subjects
whose sleep stages were primarily deep also tended to
have more SB. Moreover, better sleep quality and more
frequent SB might reduce psychological stress.

K. Tomoeda, M. Makino, C. Masaki, Y. Moritsuchi, T. Tsuda, T. Nakamoto, R. Hosokawa, international journal of stomatology & occlusion medicine 2/2011

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