RDA Work Environment and Conditions 4

Question 1

Which OSHA standard specifically addresses the handling of mercury in dental offices?

Accepted Answer

Hazard Communication Standard (29 CFR 1910.1200)

Answer

Mercury used in dental amalgam falls under the Hazard Communication Standard, which requires SDS, labeling, and worker training for hazardous chemicals.

Question 2

When designing an ergonomic dental operatory layout, the assistant's stool should be positioned so the assistant is:

Accepted Answer

Four to six inches higher than the operator for better visibility

Answer

The dental assistant's stool should be positioned 4–6 inches higher than the operator's stool to provide a clear view of the oral cavity.

Question 3

What is the primary purpose of an amalgam separator in a dental office?

Accepted Answer

To prevent mercury-containing amalgam particles from entering the wastewater system

Answer

Amalgam separators capture mercury-containing amalgam waste before it can enter the sanitary sewer system, protecting the environment.

Question 4

Noise levels in a dental office can exceed safe limits primarily due to:

Accepted Answer

High-speed handpieces and ultrasonic scalers operating continuously

Answer

High-speed handpieces and ultrasonic scalers generate noise levels that, with prolonged exposure, can contribute to noise-induced hearing loss.

Question 5

A dental assistant is pregnant. Regarding occupational radiation exposure, the recommended additional monthly dose limit for the embryo/fetus is:

Accepted Answer

0.5 mSv per month

Answer

NCRP recommends an additional monthly limit of 0.5 mSv (50 mrem) for the embryo/fetus of a declared pregnant radiation worker.

(RDA) Registered Dental Assistant Practice Test

(RDA) Registered Dental Assistant Practice Test

RDA Work Environment and Conditions 4