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Related Experiment Videos

A look at ear canal changes with jaw motion.

R J Oliveira1, B Hammer, A Stillman

  • 1Hearing Components, Inc., Maplewood, Minnesota.

Ear and Hearing
|December 1, 1992
PubMed
Summary

Jaw motion significantly alters ear canal shape, particularly in the anterior/posterior plane, by approximately 25%. This research highlights how jaw movements affect ear canal anatomy, offering insights for potential feedback issue solutions.

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Area of Science:

  • Anatomy
  • Biomechanics
  • Medical Imaging

Background:

  • The human ear canal's response to physiological movements like jaw motion is not fully understood.
  • Understanding these changes is crucial for addressing potential auditory feedback issues.

Purpose of the Study:

  • To investigate and quantify the dimensional changes in the ear canal associated with jaw motion.
  • To explore the relationship between jaw position and ear canal morphology.

Main Methods:

  • Utilized silicone ear impressions to assess ear canal shape changes at different jaw positions.
  • Employed magnetic resonance imaging (MRI) for detailed three-dimensional structural analysis and visualization of surrounding tissues.

Main Results:

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  • Silicone ear impressions effectively revealed changes in the cartilaginous ear canal region.
  • A significant approximately 25% change in the anterior/posterior ear canal dimension was observed with varying jaw positions.
  • Minimal changes were noted in the superior/inferior plane of the ear canal.

Conclusions:

  • Jaw motion induces asymmetric stress on the cartilaginous ear canal, primarily affecting its anterior/posterior dimension.
  • The findings suggest a biomechanical link between mandibular condyle action and ear canal deformation.
  • Potential solutions for jaw motion-related auditory feedback problems can be informed by these anatomical insights.