Jang C H
Department of Otolaryngology, Wonkwang Medical School, Iksan, Korea.
Clin Otolaryngol Allied Sci. 2002 Dec;27(6):509-11. doi: 10.1046/j.1365-2273.2002.00617.x.
The creation of an open mastoid cavity changes the acoustic characteristics of the external ear. The aim of this study was to ascertain the acoustic change in the external auditory canal caused by an open mastoid cavity and to compare it with mastoid obliteration. The external ear resonance characteristics were measured in 40 normal adult ears, 20 ears with an open mastoid cavity and 40 ears with an obliterated mastoid. The measurement of resonance characteristics was performed using a real ear analyser. An open mastoid cavity changed the mean peak resonant frequency of the external ear from 2.1 kHz to 2.3 kHz (P < 0.02), with a mean attenuation of 8 dB SPL at 4 kHz. An obliterated mastoid produced higher resonance frequencies from 2.5 kHz to 2.8 kHz. The sound pressure gain of the external auditory canal with an open mastoid cavity was higher than with an obliterated mastoid. The author concludes that an open mastoid cavity can affect the resonance frequency, and that this effect is reduced by mastoid obliteration. Therefore, mastoid obliteration results in a more normal ear canal both anatomically and functionally.
开放乳突腔的形成改变了外耳的声学特性。本研究的目的是确定开放乳突腔对外耳道声学的改变，并将其与乳突充填术进行比较。在40例正常成人耳朵、20例有开放乳突腔的耳朵和40例有充填乳突的耳朵中测量了外耳共振特性。使用真耳分析仪进行共振特性测量。开放乳突腔使外耳的平均峰值共振频率从2.1 kHz变为2.3 kHz（P < 0.02），在4 kHz时平均衰减8 dB SPL。充填乳突产生的共振频率更高，从2.5 kHz到2.8 kHz。有开放乳突腔的外耳道的声压增益高于有充填乳突的外耳道。作者得出结论，开放乳突腔会影响共振频率，而乳突充填术可减轻这种影响。因此，乳突充填术在解剖学和功能上使耳道更接近正常。
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