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Erschienen in:
01.09.2011 | original article
Sleep bruxism needs deep sleep stages and seems to reduce psychological stress
Erschienen in: international journal of stomatology & occlusion medicine | Ausgabe 2/2011
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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.