International Licensing Examination (ILE) Practice Test

Which earmold material is known to produce allergic reactions more frequently than others?

1. Silicone

2. Vinyl

3. Acrylic

4. Polyurethane

The correct answer is: Vinyl

Vinyl is known to produce allergic reactions more frequently than other earmold materials. This is primarily because vinyl contains certain chemical additives and processing aids, such as plasticizers and stabilizers, which can provoke allergic responses in some individuals. These allergies may manifest as skin irritations or other reactions when the material comes into contact with the skin, which is particularly concerning in applications like earmolds that are worn for extended periods. In comparison, silicone, acrylic, and polyurethane are generally less allergenic. Silicone, for instance, is well-regarded for being hypoallergenic and is less likely to cause skin reactions, making it a popular choice for medical and therapeutic uses, including earmolds. Acrylic is also considered to be low in allergenic potential, while polyurethane tends to be used in specific contexts where flexibility and durability are paramount, with a lower incidence of allergic issues reported.