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Related Experiment Videos

Head immobilization can impair jaw function.

B Häggman-Henrikson1, E Nordh, H Zafar

  • 1Department of Odontology, Clinical Oral Physiology, Umeå University, S-901 87, Umeå, Sweden.

Journal of Dental Research
|October 26, 2006
PubMed
Summary
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Jaw function involves neck muscles, as evidenced by neck muscle activity during jaw movements. Immobilizing the head impairs jaw function, highlighting the neuromuscular link between jaw and neck.

Area of Science:

  • Biomechanics of jaw and neck movements.
  • Neuromuscular control of mastication and head posture.

Background:

  • Jaw opening and closing movements are known to involve both mandibular and head motion.
  • This suggests a coordinated activation of jaw and neck muscles during masticatory function.

Purpose of the Study:

  • To test if rhythmic jaw activities involve active head repositioning.
  • To determine if head fixation impairs normal jaw function.

Main Methods:

  • Recorded simultaneous mandibular and head-neck movements in 12 healthy adults during rhythmic jaw activities.
  • In four participants, myoelectric activity of jaw and neck muscles was recorded.
  • Experiments were conducted with and without head fixation.

Main Results:

Related Experiment Videos

  • Neck muscles demonstrated activity during jaw opening, irrespective of head fixation.
  • Head fixation resulted in decreased mandibular movements and shortened jaw cycle durations.
  • Evidence of neck muscle recruitment during jaw activities was observed.

Conclusions:

  • The findings support the hypothesis that rhythmic jaw activities involve active head repositioning.
  • Head fixation negatively impacts jaw function, underscoring the neuromuscular interdependence of the jaw and neck.
  • The study highlights the significant neuromuscular relationship between jaw and neck muscles in overall jaw function.