The Mysterious Cartilaginous/Bony Ear Canal Junction
Research related to the occlusion effect (OE) suggests that the OE is minimized when contact of the ear insert (closed coupled in this case) is made with the bony ear canal1,2. Measurements of the OE for various in-canal devices are numerous and essentially support this conclusion. But, to what extent does the cartilaginous/bony ear canal…
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Ear Impression History
An ear impression has most often been used to fabricate an earmold (earpiece) that fits into portions of the outer ear to direct amplified sound toward the tympanic membrane (Figure 1). Essentially, an ear impression is made by placing a viscous, thixotropic impression material into the concha and part of the ear canal. When it…
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