Abstract
ABSTRACT The effect of earmold canal length on hearing aid gain Objective: The aim of this study is to investigate the effect of earmold canal length on gain at all frequencies. Material and Methods: The earmold impressions of 24 participants age range of 18-25 years were taken to extend to the second bend of the external auditory canal. Then, the earmold impressions taken for each participant; We processed it as a standard hard mold with 3 different canal lengths as 2nd bend, 1st to 2nd bend and 1st bend. Thus, real ear measurement is made for each participant with 3 different canal length earmold; Earmolds with short, medium and long canals and hearing aid gains were measured. Results: According to the results of our analysis, earmold with long canal length provided significant gains in all intensities at 500 and 750 Hz, high input sounds at 250 Hz and medium input sounds at 1000 Hz. Conclusion: Increasing the canal length in earmold provides additional gain, especially at low frequencies. Thanks to the additional gain got, it is thought that modifications to be made in the earmold can provide additional gain outside the hearing aid fitting program. Keywords: hearing aid, earmolds, gain, hearing, audiology
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