For behind-the-ear fittings, ear mold impressions of the patient are taken, and these impressions are sent to a manufacturer who makes the ear mold that will be fit to the chosen behind-the-ear instrument. The manufacturer is instructed on the type of material to be used, the type of mold to be made, and any modifications, venting, and tubing that is to be included with the mold.

For in-the-ear instruments, ear mold impressions are sent to the hearing aid manufacturer, who makes the casing of the in-the-ear hearing aid from the impression.

Hearing aid manufacturers also are instructed by the dispenser regarding the type of in-the-ear aid that is to be made and the type of microphone, amplifying circuits, and receivers that are most appropriate for the patient.

Recently, hearing aid manufacturers have provided dispensers the technology that allows for ear mold impressions to be digitally scanned in the office and electronically sent to the manufacturer. This process allows for a more accurate ear mold and eliminates the shipping of ear mold impressions and order forms and reduces turnaround time by several days.

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