Reduced Enamel Epithelium — MFDS Part 1 MCQ

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HardPhysiologyReduced Enamel EpitheliumMFDS Part 1

During tooth eruption, the reduced enamel epithelium fuses with the overlying oral epithelium. Odontogenic epithelial cells remaining against the enamel subsequently form the primary epithelial attachment to the erupted tooth. Which epithelial structure is initially formed by these cells?

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Correct answer: E — Junctional epithelium

The correct answer is E, junctional epithelium. During eruption, the reduced enamel epithelium fuses with the oral epithelium, allowing emergence of the crown. Reduced-enamel-epithelium-derived cells retained against the enamel form the initial junctional epithelium and its epithelial attachment to the tooth. Sulcular epithelium lines the gingival sulcus but does not constitute this initial enamel-attached epithelial compartment. Oral gingival epithelium covers the external gingival surface. The epithelial rests of Serres are remnants of the dental lamina, whereas the epithelial rests of Malassez are derived from Hertwig's epithelial root sheath within the periodontal ligament. These alternative epithelial structures therefore have different locations and developmental origins.

Reference: Yajima-Himuro S et al. The junctional epithelium originates from the odontogenic epithelium of an erupted tooth. Abstract and results. Scientific Reports. 2014;4:4867. https://pubmed.ncbi.nlm.nih.gov/24785116/