HAC HAC Earmold Selection & Hearing Aid Styles 2

Question 1

Which materials are most commonly used to fabricate custom hearing aid earmolds?

Accepted Answer

Acrylic (hard) or silicone (soft)

Answer

Custom earmolds are typically made from hard acrylic or soft silicone, with the choice based on retention requirements, comfort preferences, and acoustic needs.

Question 2

Why is an ear impression taken before fabricating a custom hearing aid or earmold?

Accepted Answer

To capture the exact shape of the ear canal and concha so a precisely fitting shell or mold can be manufactured

Answer

An ear impression creates a physical replica of the ear canal and concha, which is used as the model for manufacturing a custom-fit earmold or hearing aid shell.

Question 3

What is an open-fit dome in a RIC or slim-tube BTE hearing aid?

Accepted Answer

A small non-occluding tip that leaves much of the ear canal open, minimizing the occlusion effect

Answer

An open-fit dome leaves the ear canal largely unoccluded, reducing the occlusion effect and making it suitable for patients with normal or near-normal low-frequency hearing.

Question 4

Which earmold style provides the most retention and acoustic seal, making it suitable for severe-to-profound hearing loss?

Accepted Answer

Full shell (concha fill) earmold

Answer

A full shell earmold fills the entire concha bowl, providing maximum surface contact for retention and a secure acoustic seal essential for high-power fittings.

Question 5

What does a CROS hearing aid system do?

Accepted Answer

Routes sound picked up at a non-aidable ear to a hearing aid worn on the better ear for unilateral hearing loss

Answer

A CROS (Contralateral Routing of Signal) system transmits sound from the poorer ear's microphone wirelessly to a receiver worn on the better ear.

(HAC) Hearing Aid Certification Practice Test

(HAC) Hearing Aid Certification Practice Test

HAC HAC Earmold Selection & Hearing Aid Styles 2