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Occlusal force pattern during rhythmic human tapping movement.

Y Munakata1, M Tsuji, S Kasai

  • 1Ohu University School of Dentistry, Koriyama, Japan.

Journal of Oral Rehabilitation
|May 1, 1991
PubMed
Summary
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Rhythmic tapping reveals distinct occlusal force patterns. Jaw muscle activity and occlusal force timing are linked, suggesting they modulate tapping rhythm.

Area of Science:

  • Biomedical Engineering
  • Neuroscience
  • Biomechanics

Background:

  • Understanding the neuromuscular control of rhythmic jaw movements is crucial for prosthodontics and speech science.
  • Previous research has explored jaw muscle activity during mastication, but less is known about dynamic occlusal forces during rhythmic tasks.

Purpose of the Study:

  • To analyze the dynamic occlusal force patterns during rhythmic tapping at various frequencies.
  • To investigate the relationship between occlusal force components, tapping frequency, and masseter electromyography (EMG) activity.

Main Methods:

  • Normal subjects performed rhythmic tapping at 2, 2.5, 3.3, and 5 Hz with consistent force magnitude.
  • Occlusal forces were recorded using a custom intra-oral device.
  • Masseter muscle activity was simultaneously recorded using surface electrodes.

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Main Results:

  • A triphasic occlusal force pattern was observed, more defined at slower tapping frequencies.
  • The pattern comprised two components: one stable across frequencies, the other dependent on tapping cycle duration and decreasing with higher frequencies.
  • A significant correlation was found between occlusal power phase changes and masseter EMG burst duration.

Conclusions:

  • Tapping rhythm modulation appears linked to the duration of the occlusal power phase.
  • Jaw elevator muscle activity (masseter EMG) plays a significant role in modulating rhythmic tapping movements.