ADC Practice Question — First Aid & PDL Cell Viability

The expected long-term outcome for this delayed replantation is:

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 16-year-old boy's closed-apex upper central incisor has been dry on the ground for approximately 75 minutes before being retrieved. The tooth is clean and intact but the root surface appears dessicated. The expected long-term outcome for this delayed replantation is:

A. Normal periodontal healing with complete PDL regeneration within 6 months of treatment
B. Inflammatory root resorption that can be prevented entirely by immediate endodontic treatment
C. Ankylosis-related replacement resorption — the PDL will not regenerate after this dry time
D. Uncertain — the 75-minute threshold is not significantly different from the 60-minute cutoff

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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: 'Delayed replantation has a poor long-term prognosis. The periodontal ligament becomes necrotic and is not expected to regenerate. The expected outcome is ankylosis-related (replacement) root resorption.' 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

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.

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.

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The expected long-term outcome for this delayed replantation is:

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