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Ankylosed primary molar — NDEB AFK MCQ

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HardOrthodonticsAnkylosed primary molarNDEB AFK

A 9-year-old has a submerged primary molar 7.5 below the occlusal plane, with adjacent teeth tipping and the successor premolar visible radiographically. Percussion gives a high metallic note. What is the most likely diagnosis?

Educational content. Not a substitute for clinical judgement or local policy.

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Correct answer: A — Ankylosed primary molar

Infraocclusion, a high percussion note, and adjacent tipping around a primary molar are typical of ankylosis. Ectopic canine eruption does not explain a submerged primary molar with metallic percussion. The pearl is that management depends on severity, space loss, and successor status.

Reference: Canadian paediatric dentistry/orthodontic references; NDEB KSAs 2024