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Related Concept Videos

Anatomy of the Ear01:16

Anatomy of the Ear

Auditory sensation, commonly called hearing, involves the transformation of sonic waves into neural impulses facilitated by the structures of the auditory organ. The prominent, flesh-like structure on the side of the head, called the auricle, directs sound waves towards the auditory canal. The auricle is often mislabeled as the pinna, a term more aligned with mobile structures like a feline's external ear. The auditory canal penetrates the cranium via the external auditory meatus of the...

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3D Imaging of PDL Collagen Fibers during Orthodontic Tooth Movement in Mandibular Murine Model
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Relationship between ear canal deformation and mandibular condyle movement using an earplug-type sensor.

Junrong Qi1, Takafumi Kato2, Miki Nakaza3

  • 1Department of Orthodontics, Matsumoto Dental University, Nagano, Japan.

Journal of Oral Biosciences
|June 26, 2026
PubMed
Summary

Ear canal deformation measured by an earplug sensor strongly correlates with jaw movement. This suggests a simple, non-invasive method for assessing mandibular condyle dynamics using ear canal deformation.

Keywords:
Condylar movementDeformationEar canalJaw movement

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A Morphometric and Cellular Analysis Method for the Murine Mandibular Condyle
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Published on: January 11, 2018

Area of Science:

  • Biomechanics
  • Sensor Technology
  • Craniofacial Dynamics

Background:

  • Understanding the relationship between external physiological signals and internal joint movement is crucial for developing non-invasive monitoring techniques.
  • Jaw movement analysis is important for diagnosing and managing various temporomandibular disorders.

Purpose of the Study:

  • To investigate the correlation between ear canal deformation and mandibular condyle movement.
  • To assess the potential of an earplug-type sensor for estimating jaw movement.

Main Methods:

  • Sixteen healthy participants underwent simultaneous recording of ear canal deformation using an earplug-type sensor and mandibular condyle movement via a 6-DOF jaw-tracking system.
  • Cross-correlation analysis was employed to evaluate the relationship between ear canal deformation and anteroposterior, mediolateral, and vertical condyle movements during various jaw actions.
  • Jaw movements included opening-closing, lateral excursions, and chewing motions.

Main Results:

  • Strong correlations (0.84-0.88) were found between ear canal deformation and all components of condyle movement during opening-closing actions.
  • Correlation coefficients for lateral and chewing movements were significantly higher on the balancing side compared to the working side (p < 0.05).
  • The mediolateral component of condyle movement exhibited weaker correlations with ear canal deformation than the anteroposterior and vertical components.

Conclusions:

  • Ear canal deformation, as measured by an earplug sensor, demonstrates a strong correlation with mandibular condyle movement.
  • The findings support the feasibility of using ear canal deformation as a simple, non-invasive indicator for assessing jaw movement.
  • This approach may offer a novel method for monitoring temporomandibular joint function.