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Mandibular movement during sleep bruxism associated with current tooth attrition
Kazuo Okura1, Shuji Shigemoto1, Yoshitaka Suzuki2
1Department of Stomatognathic Function and Occlusal Reconstruction, Subdivision of Clinical Dentistry, Division of Oral Science, Institute of Biomedical Sciences, Tokushima University Graduate School, 3-18-15 Kuramoto-cho, Tokushima 770-8504, Tokushima, Japan.
Journal of Prosthodontic Research
|June 30, 2016
Summary
This study investigated sleep bruxism (SB) and its link to tooth wear. Findings suggest that forceful grinding movements during sleep bruxism events may cause canine tooth attrition.
Area of Science:
- Dentistry
- Sleep Medicine
- Biomechanics
Background:
- Sleep bruxism (SB) is characterized by teeth grinding or clenching during sleep.
- Previous observations suggest a link between mandibular movement during SB and current tooth attrition.
Observation:
- A healthy 21-year-old male underwent polysomnography to record mandibular movement and masseter electromyograms (EMGs).
- Sleep bruxism events were classified into clenching, grinding, and mixed types.
- Close-open mandibular movement cycles (CO-cycles) during grinding and mixed events were analyzed.
Findings:
- Excessive lateral movements (ELM) were observed during both closing and opening phases of CO-cycles.
- Masseter muscle activity during sleep bruxism events with ELM was comparable to, and in some phases higher than, voluntary grinding.
- Specific phases of CO-cycles with ELM showed significantly higher masseter muscle activity compared to voluntary grinding.
Implications:
- The study suggests that excessive, forceful grinding during sleep bruxism events can lead to canine tooth attrition.
- Understanding these biomechanical patterns is crucial for diagnosing and managing sleep bruxism-related dental damage.
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