ADC Practice Question — First Aid & PDL Cell Viability

what dry time threshold do most PDL cells become…

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. At what dry time threshold do most PDL cells become non-viable?

A. After 30 minutes of extra-alveolar dry time, most PDL cells are no longer viable
B. After 60 minutes of total extra-oral time, including time spent in a storage medium
C. After 15 minutes of dry time — this is why immediate replantation is critical for success
D. PDL cells remain viable indefinitely if the tooth surface is kept moist with any liquid

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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: A

IADT: 'After an extra-alveolar dry time of 30 minutes, most PDL cells are non-viable.' This is the biological threshold — distinct from the 60-minute clinical classification boundary for Group 3. SOURCE — Fouad AF et al. IADT Avulsion Guidelines, Dent Traumatol 2020;36:331-342, Section 3, p.333

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

Should I memorise guidelines word-for-word for First Aid & PDL Cell Viability?

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

How are First Aid & PDL Cell Viability questions structured in the ADC written exam?

ADC First Aid & PDL Cell Viability questions present as clinical vignettes requiring management decisions. The correct answer is always traceable to a guideline source.

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what dry time threshold do most PDL cells become…

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