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Fusion vs Gemination — NDEB AFK MCQ

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ModerateDental Anatomy & OcclusionFusion vs GeminationNDEB AFK

Which developmental anomaly is characterised by the formation of a single enlarged tooth from what appears to be the fusion of a normal tooth with a supernumerary tooth?

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Correct answer: B — Fusion

Fusion is the union of two adjacent tooth germs during development, resulting in a single enlarged tooth with two pulp chambers (or a divided pulp chamber) and a reduced tooth count in the arch (unless the fusion involves a supernumerary). The crown is wider than normal with a groove or notch at the junction site. Gemination is the incomplete splitting of a single tooth germ, resulting in a bifid crown with a single root canal and normal tooth count. The key distinction: fusion reduces the tooth count; gemination does not.

Reference: Neville – Oral and Maxillofacial Pathology, 4th ed., 2016