ADC Practice Question — First Aid & PDL Cell Viability

Patient C's tooth has been dry for 90 minutes. Why…

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 patients present with avulsed teeth: Patient A has well-controlled type 2 diabetes. Patient B has severe caries on the avulsed tooth itself. Patient C is a healthy 14-year-old whose tooth has been dry for 90 minutes. Patient C's tooth has been dry for 90 minutes. Why does the IADT still recommend replantation?

A. Because PDL cells can regenerate from the socket walls even if the root surface cells have died
B. Because replantation maintains alveolar bone contour and keeps future treatment options open
C. Because 90 minutes is within the safe window — PDL cells survive up to 120 minutes dry
D. Because the ankylosis that develops actually strengthens the tooth and is considered a positive outcome

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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: 'The goal of replantation is to restore, at least temporarily, esthetics and function while maintaining alveolar bone contour, width, and height. Replantation will keep future treatment options open.' SOURCE — Fouad AF et al. IADT Avulsion Guidelines, Dent Traumatol 2020;36:331-342, Section 3.1.3

Source: Fouad AF et al. IADT Avulsion Guidelines, Dent Traumatol 2020;36:331-342, Section 3.1.3

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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Patient C's tooth has been dry for 90 minutes. Why…

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