ADC Practice Question — First Aid & PDL Cell Viability

Which PDL cell viability group does Tooth B belong to?

Q: How do I approach an unfamiliar First Aid & PDL Cell Viability vignette?

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

Q: How should I prepare for Dental Traumatology in the ADC exam?

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

Dental trauma questions test protocol-level decisions — splint type, duration, follow-up timing — where one wrong detail means a wrong answer. This exam-level vignette tests your ability to work through clinical details and arrive at the correct management.

Three avulsed teeth arrive at the clinic. Tooth A was replanted at the scene within 10 minutes. Tooth B was placed in milk immediately and has been stored for 45 minutes total with 5 minutes dry time. Tooth C was wrapped in a dry handkerchief for 90 minutes. Which PDL cell viability group does Tooth B belong to?

A. Group 1 — PDL cells are most likely viable since it was stored within minutes
B. Group 2 — PDL cells may be viable but compromised, stored in medium with dry time <60 min
C. Group 3 — any tooth not replanted immediately has non-viable PDL cells regardless of storage
D. Cannot classify — PDL viability requires histological examination before group assignment

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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

IADT PDL Group 2: 'The tooth has been kept in a storage medium (eg, milk, HBSS, saliva, or saline) and the total extra-oral dry time has been <60 minutes.' Tooth B: 5 min dry + 45 min in milk = total dry time 5 min (<60), stored in medium → Group 2. SOURCE — Fouad AF et al. IADT Avulsion Guidelines, Dent Traumatol 2020;36:331-342, Section 3

Source: Fouad AF et al. IADT Avulsion Guidelines, Dent Traumatol 2020;36:331-342, Section 3

Remy's study tip — Trauma questions hinge on: tooth maturity (open vs closed apex), time out of mouth, storage medium, and fracture type.

Exam preparation FAQ

How do I approach an unfamiliar First Aid & PDL Cell Viability 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 Dental Traumatology in the ADC exam?

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

Every answer, traced to the source.

Remy — the AI tutor inside Reviz — drills you on 7,000+ ADC-style cited questions with spaced repetition, on WhatsApp and the web.

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Which PDL cell viability group does Tooth B belong to?

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