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Bone conduction threshold levels for different bone vibrator types.

T Frank1, D C Byrne, L A Richards

  • 1Pennsylvania State University, University Park.

The Journal of Speech and Hearing Disorders
|August 1, 1988
PubMed
Summary
This summary is machine-generated.

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Different bone vibrator types significantly impact bone conduction (BC) hearing test results at low frequencies. This highlights the need to specify vibrator type for accurate BC audiometry reference levels.

Area of Science:

  • Audiology
  • Hearing Science
  • Biomedical Engineering

Background:

  • Bone conduction (BC) audiometry is crucial for diagnosing hearing loss.
  • Standardization of BC testing requires consistent reference levels.
  • Vibrator type may influence BC threshold measurements.

Purpose of the Study:

  • To investigate the influence of different bone vibrator types on BC hearing thresholds.
  • To determine if specific vibrator models affect threshold measurements at various frequencies.

Main Methods:

  • 100 subjects underwent BC threshold testing using mastoid placement.
  • Radioear B-71, B-72, and Pracitronic KH 70 bone vibrators were employed.
  • Masking and ear canal occlusion were used as needed to ensure accurate measurements.

Related Experiment Videos

Main Results:

  • BC thresholds at 250 Hz were significantly higher (10.5 dB) with B-72 and KH 70 compared to B-71.
  • BC thresholds at 500 Hz were significantly lower (5.5 dB) with B-72 and KH 70 compared to B-71.
  • No significant differences were observed at higher frequencies (1000-4000 Hz) among vibrator types.

Conclusions:

  • Vibrator type significantly influences BC thresholds at 250 Hz and 500 Hz.
  • Reference equivalent threshold force levels (RETFLs) for BC audiometry must be specified by bone vibrator type for accurate interpretation.