ADC Practice Question — Key IPC Terminology

Besides microorganisms from the oral cavity, what other source of contamination is found in aerosols from powered dental equipment?

Infection control in the ADC exam tests decision-making around exposure incidents, instrument classification, and decontamination protocols. This exam-level vignette tests your ability to work through clinical details and arrive at the correct management.

Dr Ahmed Hassan is conducting a staff meeting at his practice to discuss aerosol-generating procedures and their implications for infection control. His dental hygienist, Lisa Thompson, asks about the specific equipment that creates aerosols and the particle sizes involved. The practice has recently updated their protocols following new guidelines and wants to ensure all staff understand which procedures require enhanced precautions. Besides microorganisms from the oral cavity, what other source of contamination is found in aerosols from powered dental equipment?

A. Microorganisms from the air conditioning system
B. Microorganisms that have originated from dental unit waterlines
C. Microorganisms from the suction system
D. Microorganisms from the compressed air supply

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Sources cited

Therapeutic Guidelines v4 Odell's 3rd & 4th Ed IADT 2020 Code of Conduct CMS (Evans) Infection Control + more

Show the answer and cited explanation

Correct answer: B

Aerosols from powered dental equipment also contain microorganisms that have originated from dental unit waterlines (ICG p.20).

Source: ICG Section 2: Personal Protective Equipment

Remy's study tip — The differentiator is usually the Spaulding classification level or the step order in a protocol.

Exam preparation FAQ

How do I approach an unfamiliar Key IPC Terminology vignette?

Extract key clinical data from the stem before reading options. There are usually 3–4 critical variables that determine the correct answer.

How should I prepare for Infection Control in the ADC exam?

Build competence across all topics. The exam tests application of guidelines to clinical scenarios, not memorisation.

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Besides microorganisms from the oral cavity, what other source of contamination is found in aerosols from powered dental equipment?

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