Ethyl Methacrylate to Silicone Ear Impressions
Ear impression material is basically a compound (substance formed from two or more elements) with polymer, or a blend of polymers, as the fundamental component in determining the impression material properties. Affecting the polymer makeup are the type of molecular forces that are applied. Monomers (one part) are the building blocks that when bonded together…
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Ear Impression History – From Teeth to the Ear
Earmolds for hearing aids have been a staple for many years, made from impressions of the ear. Although considerable information exists about the earmold, the finished product, early ear impression history is murky. What we do know is that ear impressions took their lead from impressions of the teeth (dentistry), following somewhat later. The contribution…
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