Tooth Morphogenesis — MFDS Part 1 MCQ

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ModeratePhysiologyTooth MorphogenesisMFDS Part 1

During morphodifferentiation in the bell stage of tooth development, folding of which structure establishes the contour of the future dentino-enamel junction and hence the form of the tooth crown?

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Correct answer: D — Inner enamel epithelium

The correct answer is D, the inner enamel epithelium. During bell-stage morphodifferentiation, differential proliferation and folding of this layer establish the epithelial–mesenchymal interface that becomes the dentino-enamel junction; its contour therefore defines the cusps and overall crown form. Its cells subsequently differentiate into ameloblasts. The dental papilla gives rise to odontoblasts and dental pulp, rather than independently outlining the crown. The outer enamel epithelium forms the external boundary of the enamel organ, while the stellate reticulum provides structural and metabolic support. The dental follicle produces the periodontal supporting tissues, including cementum, periodontal ligament and alveolar bone. Experimental alteration of bell-stage inner enamel epithelial proliferation and folding results in abnormal cusp morphology.

Reference: Wang et al. Kdf1 Regulates Molar Cusp Morphogenesis via the PI3K/AKT/mTOR Signalling Axis. Cell Proliferation, 2025. https://pubmed.ncbi.nlm.nih.gov/40649989/