Revascularisation Immature Teeth — MFDS Part 1 MCQ
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Correct answer: D — Resolution of apical disease with further root lengthening, dentinal-wall thickening and apical closure
Explanation lettering: D = shown as A · A = shown as D
The correct answer is A. In a necrotic immature permanent tooth, a regenerative endodontic procedure aims to control infection and establish conditions that may permit continued root maturation, including increased root length, thicker dentinal walls and apical closure. This potential for further maturation distinguishes it from apexification. Option B describes an apical-plug apexification technique: it facilitates obturation but does not principally aim to increase root length or wall thickness. Conventional preparation and obturation (C) are difficult and potentially weakening in a tooth with a wide-open apex and thin walls. Apexogenesis following pulpotomy (D) requires viable radicular pulp, which is excluded by confirmed necrosis. Observation alone (E) is inappropriate once pulp necrosis is established. Continued root development after regenerative treatment is a desired outcome rather than a guaranteed result.
Reference: Faculty of General Dental Practice (UK) and Faculty of Dental Surgery, Royal College of Surgeons of England. Antimicrobial Prescribing in Dentistry, section 11.3, Regenerative Endodontic Procedures, 2020. https://www.rcseng.ac.uk/-/media/Files/RCS/FDS/Publications/FDS-AMP-2020.pdf