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Research of masticatory function using hemiplegia simulator equipment.

Ichiro Ohsawa1, Hiroshi Uematsu

  • 1Division of Gerontology and Gerodontology, Department of Gerodontology, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan. i_ohsawa.gerd@tmd.ac.jp

Gerodontology
|September 30, 2011
PubMed
Summary

Simulating hemiplegia revealed that occlusal balance is disturbed in the characteristic posture. This study highlights how hemiplegia affects jaw muscle activity and bite force dynamics.

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Area of Science:

  • Neurology
  • Biomechanics
  • Dental Science

Background:

  • Hemiplegic patients often develop Wernicke-Mann contracture, affecting limb positioning.
  • This characteristic posture may influence occlusal patterns due to adaptive stress responses.

Purpose of the Study:

  • To investigate the dynamic occlusal adaptations in a simulated hemiplegic state.
  • To compare functional occlusion in a normal state versus a simulated Wernicke-Mann contracture.

Main Methods:

  • Hemiplegia was simulated in healthy individuals using specialized equipment.
  • Occlusal force, masseter muscle activity (electromyography), and stabilometry were measured.

Main Results:

  • Significant differences in occlusal force and masseter muscle activity were observed during simulated hemiplegia.

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  • Increased masseter muscle activity was noted on the "paralyzed" side.
  • Jaw movement patterns shifted from antero-posterior to lateral during simulated hemiplegia.

    • Conclusions:

    • Hemiplegia simulator equipment is a valuable tool for studying hemiplegia.
    • The characteristic posture of hemiplegia significantly disturbs occlusal balance.