Which PDL cell viability group does Tooth B belong to?
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. Which PDL cell viability group does Tooth B belong to?
- A. Group 1 — PDL cells are most likely viable since it was stored within minutes
- B. Group 2 — PDL cells may be viable but compromised, stored in medium with dry time <60 min
- C. Group 3 — any tooth not replanted immediately has non-viable PDL cells regardless of storage
- D. Cannot classify — PDL viability requires histological examination before group assignment
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IADT PDL Group 2: 'The tooth has been kept in a storage medium (eg, milk, HBSS, saliva, or saline) and the total extra-oral dry time has been <60 minutes.' Tooth B: 5 min dry + 45 min in milk = total dry time 5 min (<60), stored in medium → Group 2. SOURCE — Fouad AF et al. IADT Avulsion Guidelines, Dent Traumatol 2020;36:331-342, Section 3
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