Frank T, Byrne D C, Richards L A
Pennsylvania State University, University Park.
J Speech Hear Disord. 1988 Aug;53(3):295-301. doi: 10.1044/jshd.5303.295.
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 less than .05) higher by 10.5 dB and at 500 Hz were significantly (p less than .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.
本研究确定骨传导（BC）阈值是否受振动器类型的影响。使用Radioear B - 71、B - 72和Pracitronic KH 70骨振动器通过乳突放置法为100名受试者获取BC阈值。非测试耳进行掩蔽（等效听力级30 dB），振动器同侧耳保持开放，除非在3000和4000 Hz测试时，耳道用耳塞堵塞以防止声辐射。与B - 71相比，使用B - 72和KH 70在250 Hz获得的BC阈值显著更高（p小于0.05），高10.5 dB，在500 Hz显著更低（p小于0.05），低5.5 dB。在其他频率（1000、2000、3000和4000 Hz），不同振动器类型的BC阈值无显著差异。研究结果表明，骨传导听力测定的参考等效阈值力级（RETFLs）应由骨振动器类型指定。
