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Correlation Between Sleep-Time Masseter Muscle Activity and Tooth Wear: An Electromyographic Study
Journal of Oral & Facial Pain and Headache
|April 24, 2019
Summary
Tooth wear does not correlate with sleep-time masseter muscle activity (sMMA) in healthy young adults. This study found no significant link, suggesting tooth wear is not a reliable indicator of sleep bruxism or sMMA.
Area of Science:
- Dentistry
- Sleep Medicine
- Biomedical Engineering
Background:
- Sleep-time masseter muscle activity (sMMA) is associated with sleep bruxism (SB).
- Tooth wear is a potential clinical sign of bruxism, but its direct correlation with sMMA requires investigation.
Purpose of the Study:
- To evaluate the relationship between tooth wear and sMMA in healthy young adults.
- To determine if tooth wear can serve as an indicator of sleep bruxism or sMMA.
Main Methods:
- 41 healthy adults underwent 2-night home recordings of masseter muscle EMG and ECG.
- Sleep bruxism index, sMMA events (phasic, tonic, mixed), and total sMMA were quantified.
- Tooth wear was assessed on digital dental casts using a six-degree scale.
Main Results:
- The average sleep bruxism index was 4.5 ± 2.6 episodes/hour.
- Average total sMMA events per night were 97.2 ± 55.2, with ~60% being phasic.
- No significant correlations were found between sMMA variables and tooth wear (P values .11–.69, r values 0.064–0.253).
Conclusions:
- The study could not reject the null hypothesis of no correlation between tooth wear and sMMA.
- Tooth wear is not a reliable indicator of ongoing sleep bruxism or sMMA.
- Further research is needed to explore the complex relationship between tooth wear and sleep phenomena.
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