Bone Conduction Threshold Levels for Different Bone Vibrator Types This study determined if bone conduction (BC) thresholds were influenced by vibrator type. BC thresholds were obtained for 100 subjects using mastoid placement of Radioear B-71 and B-72 and Pracitronic KH 70 bone vibrators. The nontest ear was masked (30 dB EL) and the ear ipsilateral to the vibrator was ... Reports
Reports  |   August 01, 1988
Bone Conduction Threshold Levels for Different Bone Vibrator Types
 
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Article Information
Reports   |   August 01, 1988
Bone Conduction Threshold Levels for Different Bone Vibrator Types
Journal of Speech and Hearing Disorders, August 1988, Vol. 53, 295-301. doi:10.1044/jshd.5303.295
History: Received March 5, 1987 , Accepted October 19, 1987
 
Journal of Speech and Hearing Disorders, August 1988, Vol. 53, 295-301. doi:10.1044/jshd.5303.295
History: Received March 5, 1987; Accepted October 19, 1987

This study determined if bone conduction (BC) thresholds were influenced by vibrator type. BC thresholds were obtained for 100 subjects using mastoid placement of Radioear B-71 and B-72 and Pracitronic KH 70 bone vibrators. The nontest ear was masked (30 dB EL) and the ear ipsilateral to the vibrator was open except when testing at 3000 and 4000 Hz when the ear canal was occluded with an earplug to guard against acoustic radiation. BC thresholds at 250 Hz obtained with the B-72 and KH 70 were significantly (p < .05) higher by 10.5 dB and at 500 Hz were significantly (p < .05) lower by 5.5 dB than for the B-71. BC thresholds at other frequencies (1000, 2000, 3000, and 4000 Hz) were not significantly different among vibrator types. The findings indicated that reference equivalent threshold force levels (RETFLs) for BC audiometry should be specified by bone vibrator type.

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