ADC Practice Question — First Aid & PDL Cell Viability

25 minutes dry, what is the biological status of the…

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.

A parent calls the dental clinic asking for advice. Their child's tooth was knocked out 25 minutes ago and has been sitting on the kitchen table unwrapped since. They have milk at home. At 25 minutes dry, what is the biological status of the PDL cells on this tooth?

A. Most PDL cells are already non-viable — the 30-minute threshold is nearly reached
B. Most PDL cells are still viable since the critical threshold of 60 minutes has not been reached
C. PDL cells are likely significantly compromised but not yet at the point of majority cell death
D. PDL cell viability cannot be estimated from dry time alone — it depends on temperature and humidity

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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

IADT: 'After an extra-alveolar dry time of 30 minutes, most PDL cells are non-viable.' At 25 minutes, the tooth is approaching but has not crossed this biological threshold — cells are compromised but not majority-dead. Placing in milk NOW is critical. 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

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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