IHS Earmold and Impression Techniques 5

Question 1

Which earmold material is most appropriate for a patient with a known sensitivity to acrylic resins?

Accepted Answer

Medical-grade silicone

Answer

Medical-grade silicone is hypoallergenic and the preferred alternative for patients who experience allergic reactions to acrylic-based earmold materials.

Question 2

When measuring the depth of otoblock placement, a standard guideline for adults is to position the otoblock approximately:

Accepted Answer

2–5 mm past the second bend of the ear canal

Answer

Placing the otoblock 2–5 mm past the second bend ensures the impression captures enough canal length for a deep canal fit while maintaining a safe distance from the tympanic membrane.

Question 3

A patient's earmold feels loose after six months of use even though it fit well initially. The most likely cause is:

Accepted Answer

Natural changes in ear canal shape due to aging or weight change

Answer

The shape of the ear canal changes gradually due to factors such as aging, significant weight loss or gain, and skin changes, which can cause a previously well-fitting earmold to feel loose over time.

Question 4

Which type of vent has the greatest effect on reducing the occlusion effect while minimizing feedback risk?

Accepted Answer

A pressure vent (pinhole vent)

Answer

A pressure vent (pinhole vent, ~0.8 mm) is small enough to reduce feedback risk but still allows canal pressure equalization, providing occlusion relief without compromising acoustic seal significantly.

Question 5

The 'canal' earmold style, compared to the 'half-shell,' provides which primary advantage?

Accepted Answer

Greater cosmetic appeal due to a smaller, less visible profile

Answer

The canal style sits entirely within the ear canal with minimal or no concha bowl portion, making it significantly less visible than larger styles like the half-shell.

IHS - International Hearing Society Practice Test

IHS - International Hearing Society Practice Test

IHS Earmold and Impression Techniques 5