ADC Practice Question — First Aid & PDL Cell Viability

Which PDL group applies, and what does this mean for the endodontic plan?

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 high-difficulty vignette tests your ability to work through clinical details and arrive at the correct management.

A 9-year-old with penicillin allergy (anaphylaxis) has an avulsed upper left central incisor with an open apex. The tooth was dry for 15 minutes, then stored in milk for 40 minutes. Radiographs reveal a buccal alveolar wall fracture. The dentist replants the tooth and plans the complete management protocol. The total extra-oral time is 55 minutes (15 dry + 40 in milk). Which PDL group applies, and what does this mean for the endodontic plan?

A. Group 2 — but endodontic treatment must still begin within 2 weeks as for all replanted teeth
B. Group 3 — the 15-minute dry period exceeds the viability window, so PDL cells are non-viable
C. Group 2 — and since the apex is open, the goal is revascularization with endodontic treatment deferred unless necrosis develops
D. Group 1 — the tooth was in milk within 15 minutes, which counts as immediate replantation

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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

Integration: (1) PDL group = Group 2 (stored in milk, total dry <60min). (2) Open apex = revascularization goal, NOT immediate RCT. (3) RCT only if necrosis and infection develop. Three protocol sections combined. SOURCE — Fouad AF et al. IADT Avulsion Guidelines, Dent Traumatol 2020;36:331-342, Sections 3, 3.2.2

Source: Fouad AF et al. IADT Avulsion Guidelines, Dent Traumatol 2020;36:331-342, Sections 3 & 3.2.2

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.

Take the Remy Challenge

Which PDL group applies, and what does this mean for the endodontic plan?

The only ADC prep platform where every answer is traced to the guideline source.

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