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Enamel Tufts — MFDS Part 1 MCQ

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HardPhysiologyEnamel TuftsMFDS Part 1

A ground section of a permanent tooth shows brush-like structures arising at the dentino-enamel junction and extending for a short distance into the inner enamel. Which description best identifies the structural basis of these enamel tufts?

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Correct answer: B — Bundles of hypomineralised enamel prisms with retained protein-rich material concentrated along prism boundaries

Enamel tufts are bundles of hypomineralised enamel prisms arising at the dentino-enamel junction, with retained organic material concentrated around prism boundaries or sheaths. Their relatively high protein and low mineral content produce their characteristic brush-like appearance. Odontoblast processes crossing the junction form enamel spindles, not tufts. Surface-originating, organic-filled linear defects describe enamel lamellae. Alternating bands caused by prism decussation are Hunter–Schreger bands, while rhythmic incremental markings are striae of Retzius. Specific attribution of tuft material solely to enamelin or tuftelin is avoided because biochemical studies indicate a heterogeneous mixture of tuft-associated proteins.

Reference: Amizuka N, Uchida T, Fukae M, Yamada M, Ozawa H. Ultrastructural and immunocytochemical studies of enamel tufts in human permanent teeth. Archives of Histology and Cytology. 1992;55(2):179–190. https://pubmed.ncbi.nlm.nih.gov/1497948/