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Related Experiment Videos

Quantitative study of bite force during sleep associated bruxism.

K Nishigawa1, E Bando, M Nakano

  • 1Department of Fixed Prosthodontics, The University of Tokushima, School of Dentistry, Tokushima, Japan. keisuke@dent.tokushima-u.ac.jp

Journal of Oral Rehabilitation
|May 31, 2001
PubMed
Summary

Nocturnal bite force during sleep bruxism can be surprisingly powerful, sometimes exceeding daytime voluntary maximum bite force. This study measured bruxism events, revealing significant nocturnal forces in subjects.

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Area of Science:

  • Dentistry
  • Sleep Medicine
  • Biomechanics

Background:

  • Sleep-associated bruxism is a common condition characterized by involuntary jaw clenching and grinding during sleep.
  • Understanding the forces involved in bruxism is crucial for developing effective management strategies and preventing dental damage.

Purpose of the Study:

  • To quantify nocturnal bite force amplitudes and durations during sleep-associated bruxism.
  • To compare nocturnal bite forces with maximum voluntary daytime bite forces.

Main Methods:

  • Ten subjects with bruxism wore custom dental appliances equipped with strain-gauge transducers for nocturnal bite force measurement.
  • Measurements were taken over three nights, with 499 bruxism events recorded and analyzed.
  • Maximum voluntary bite forces were also measured during daytime for comparison.

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Main Results:

  • The mean amplitude of nocturnal bruxism events was 22.5 kgf, with a mean duration of 7.1 seconds.
  • The highest recorded nocturnal bite force reached 42.3 kgf in some subjects.
  • Nocturnal bite forces, on average, reached 53.1% of maximum voluntary daytime bite forces, but could exceed it.

Conclusions:

  • Nocturnal bite force during sleep bruxism can significantly exceed maximum voluntary daytime bite force.
  • These findings highlight the potential for substantial occlusal forces during sleep, emphasizing the need for protective dental interventions.