Ankylosed Primary Molar — NDEB AFK MCQ
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Correct answer: C — Infraocclusion (submergence) relative to adjacent teeth
An ankylosed primary molar is fused directly to the alveolar bone (no PDL interposed), preventing eruption. As the adjacent teeth and alveolar processes continue to grow, the ankylosed tooth appears to 'submerge' (infraocclusion). It has a characteristic high-pitched metallic sound on percussion and is immobile. Radiographically, the PDL space is absent. Management depends on the degree of submergence and the presence/absence of the permanent successor.
Reference: Dean – McDonald and Avery's Dentistry for the Child and Adolescent, 11th ed., 2021