ADEX Dental Hygiene Infection Control Principles Questions and Answers

Question 1

Which of the following methods provides the ultimate verification of sterilization success by directly challenging the sterilization process?

Accepted Answer

Using a biological indicator (spore test) on a weekly basis.

Answer

Biological indicators, or spore tests, are the most accepted method for monitoring the sterilization process because they directly assess the procedure's effectiveness at killing the most resistant microorganisms, such as Geobacillus stearothermophilus. While mechanical and chemical indicators are crucial for routine monitoring of each load, they only show that certain physical conditions were met, not that sterilization was actually achieved.

Question 2

A dental hygienist sustains a percutaneous injury with a contaminated scaler. After performing immediate first aid by washing the wound with soap and water, what is the required NEXT step according to the OSHA Bloodborne Pathogens Standard?

Accepted Answer

Report the exposure incident to the employer or designated supervisor.

Answer

According to OSHA's Bloodborne Pathogens Standard, after immediate first aid, the exposure incident must be reported immediately to the employer. This action initiates the required post-exposure evaluation and follow-up protocol, which the employer is responsible for providing at no cost to the employee. This protocol includes documenting the incident, evaluating the source patient (with consent), and providing confidential medical counseling and testing for the employee.

Question 3

Which of the following actions during instrument reprocessing represents a critical error that could lead to sterilization failure?

Accepted Answer

Placing clean, but still damp, instruments into a sterilization pouch.

Answer

Instruments must be completely dry before being packaged for heat sterilization. Any residual moisture can interfere with the sterilization process and may cause wet packs, which can wick microorganisms through the packaging material after the cycle is complete, compromising the sterility of the instruments.

Question 4

According to CDC guidelines, a clinical contact surface (e.g., a light handle) that is visibly contaminated with blood must be cleaned and then treated with which type of disinfectant?

Accepted Answer

An intermediate-level disinfectant with a tuberculocidal claim.

Answer

For clinical contact surfaces visibly contaminated with blood, the CDC recommends cleaning followed by disinfection with an EPA-registered hospital disinfectant that has a tuberculocidal claim (i.e., an intermediate-level disinfectant). The ability to kill Mycobacterium tuberculosis demonstrates a disinfectant's potency against a broad range of pathogens. Low-level disinfectants are for surfaces not contaminated with blood, and high-level disinfectants are for heat-sensitive semi-critical items.

Question 5

A hygienist is preparing for a procedure that will generate significant aerosols. What is the correct sequence for donning (putting on) the required Personal Protective Equipment (PPE)?

Accepted Answer

Gown, Mask, Eye Protection, Gloves

Answer

The CDC recommends donning PPE in an order that moves from the body core outwards, finishing with the hands. The correct sequence is: first the gown, followed by the mask or respirator, then goggles or a face shield, and finally, gloves. Gloves are donned last so they can be pulled over the cuffs of the gown, creating a secure barrier.

ADEX - Dental Hygiene Exam Practice Test

ADEX - Dental Hygiene Exam Practice Test

ADEX Dental Hygiene Infection Control Principles Questions and Answers