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Related Experiment Videos

Role of occlusal vertical dimension in spindle function.

T Yabushita1, J L Zeredo, K Toda

  • 1Orthodontic Science, Department of Orofacial Development and Function, Division of Oral Health Sciences, Graduate School, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549. yabushita-t.orts@tmd.ac.jp

Journal of Dental Research
|February 23, 2005
PubMed
Summary

Increased occlusal vertical dimension (OVD) reduces jaw muscle spindle sensitivity. This suggests peripheral sensory plasticity may allow physiological adaptation to changes in OVD, challenging previous assumptions about OVD regulation.

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Area of Science:

  • Neuroscience
  • Dental Physiology
  • Sensory Biology

Background:

  • Jaw-muscle spindles are traditionally considered key regulators of occlusal vertical dimension (OVD).
  • The hypothesis that long-term OVD alterations impact muscle spindle sensory input remains largely unexplored.

Purpose of the Study:

  • To investigate the functional changes in masseter muscle spindles under conditions of increased occlusal vertical dimension (iOVD).
  • To challenge the established role of muscle spindles in OVD maintenance by examining their response to altered OVD.

Main Methods:

  • Utilized barbiturate-anesthetized female Wistar rats (n=20), divided into control and iOVD groups.
  • Induced iOVD by applying a 2.0-mm composite resin build-up to the maxillary molars in the experimental group.

Related Experiment Videos

  • Recorded responses of primary and secondary masseter muscle spindle endings to cyclic sinusoidal stretches.

    • Main Results:

    • Masseter muscle spindle sensitivity demonstrated a gradual decrease following the induction of iOVD.
    • Distinct effects were observed on primary and secondary muscle spindle endings.
    • The findings indicate a reduction in masseter muscle spindle sensitivity due to iOVD.

    Conclusions:

    • Increased occlusal vertical dimension leads to a reduction in masseter muscle spindle sensitivity.
    • Peripheral sensory plasticity in jaw muscles may occur in response to OVD changes.
    • These adaptive changes could provide a physiological basis for clinical occlusal adjustments.