ADEX Infection Control and Safety 2

Question 1

Which hepatitis virus is most commonly transmitted via contaminated dental instruments?

Accepted Answer

Hepatitis B

Answer

Hepatitis B virus (HBV) is a primary bloodborne pathogen of concern in dentistry due to its high survival rate on surfaces and low infectious dose.

Question 2

What is the minimum contact time required for a high-level disinfectant to achieve its labeled efficacy?

Accepted Answer

The manufacturer's specified contact time

Answer

Disinfectants must remain wet on the surface for the full manufacturer-specified contact time to achieve the labeled level of kill.

Question 3

Which CDC transmission-based precaution category applies to patients with active pulmonary tuberculosis?

Accepted Answer

Airborne precautions

Answer

Pulmonary TB is transmitted by airborne droplet nuclei (<5 µm) and requires airborne precautions including an N95 respirator.

Question 4

A dental hygienist recaps a needle using the one-hand scoop technique. This practice is intended to:

Accepted Answer

Reduce the risk of needlestick injury

Answer

The one-hand scoop technique keeps the non-dominant hand away from the needle, significantly reducing the risk of an accidental needlestick.

Question 5

Which item requires sterilization rather than disinfection before reuse on another patient?

Accepted Answer

Dental explorer

Answer

A dental explorer is a critical instrument that penetrates soft tissue, requiring sterilization between every patient use.

ADEX - Dental Hygiene Exam Practice Test