Hearing Self-Test

Legalized OTC (over-the-counter) hearing aids are expected as a hearing-impaired consumer option. One of the arguments against this practice is that the potential purchaser has not had an audiogram from which to determine the type and degree of hearing levels to assist in the selection of the appropriate hearing aid, if such is to be recommended.…

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Ear Impression Materials – Ethyl Methacrylate to Silicone

The history of ear impression materials has not been systematically traced, even though what have been described as “custom” earmolds have been reported to at least 18851, implying that some kind of ear impression served as a model. The first report identifying an impression material for the ear (wax) was by Hawksley in 1890.  The Hawksley…

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