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Related Experiment Videos

The frequency range of TMJ sounds.

S E Widmalm1, W J Williams, D Djurdjanovic

  • 1Department of Biologic Sciences, School of Dentistry, University of Michigan, Ann Arbor, MI, USA. sew@umich.edu

Journal of Oral Rehabilitation
|March 13, 2003
PubMed
Summary

Temporomandibular joint (TMJ) sounds may have higher frequencies than previously thought. Using ear canal microphones reveals higher TMJ sound frequencies compared to skin contact sensors.

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Area of Science:

  • Biomechanics
  • Acoustics
  • Otolaryngology

Background:

  • Conflicting reports exist regarding the upper frequency limit of temporomandibular joint (TMJ) sounds, with some suggesting it is around 650 Hz.
  • The transmission path of TMJ vibrations through head tissues and the recording methods used may influence the measured frequency spectrum.

Purpose of the Study:

  • To test the hypothesis that TMJ sounds contain frequencies significantly above 650 Hz.
  • To investigate the impact of recording methods (contact sensors vs. microphones) and transmission distance on TMJ sound frequency measurements.

Main Methods:

  • Comparison of time-frequency distributions of 172 TMJ clickings from three subjects.
  • Recordings were made using an ear canal microphone on the affected side, a skin contact transducer over the joint, and microphones in both ear canals.

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Main Results:

  • TMJ clickings recorded with an ear canal microphone on the affected side showed energy peaks significantly higher (117-1922 Hz) than those recorded with contact sensors (47-375 Hz).
  • Frequencies recorded via ear canal microphones on the affected side were also significantly higher than those from the contralateral ear canal microphone (141-703 Hz).

Conclusions:

  • TMJ sounds can possess frequencies well above the previously reported 650 Hz limit.
  • Current recording methods, particularly contact sensors and recordings from the non-affected side, may underestimate the true high-frequency content of TMJ sounds. Further research using high-frequency vibration-capable methods is needed.