ADC Practice Question — Endodontic Files & Instruments

Which sterilisation cycle is acceptable for the restorative dental handpieces?

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 Raj Mehta has just completed a root canal treatment on Patient A using hand K-files and rotary NiTi ProTaper files. He then has Patient B scheduled for a crown preparation requiring high-speed and low-speed handpieces. His dental assistant needs to reprocess the instruments from Patient A and prepare the handpieces for Patient B. Which sterilisation cycle is acceptable for the restorative dental handpieces?

A. N cycle only
B. N cycle or S cycle
C. S cycle (with proven performance for handpieces) or B cycle
D. B cycle only — handpieces always require pre-vacuum sterilisation

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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: C

For restorative dental handpieces: use either an S cycle steriliser with proven performance for handpieces, or a B cycle steriliser with vacuum cycles. It is NOT acceptable to use an N cycle steriliser since air removal from hollow areas is insufficient. Note: surgical handpieces MUST be packaged and sterilised using a B cycle only. (ICG p.72)

Source: ICG Section F: Handpiece Management

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

Exam preparation FAQ

How are Endodontic Files & Instruments questions structured in the ADC written exam?

ADC Endodontic Files & Instruments questions present as clinical vignettes requiring management decisions. The correct answer is always traceable to a guideline source.

Should I memorise guidelines word-for-word for Endodontic Files & Instruments?

Focus on decision points — when the guideline says X vs Y. The exam tests application, not recitation.

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Which sterilisation cycle is acceptable for the restorative dental handpieces?

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