Tooth Eruption Mechanism — MFDS Part 1 MCQ
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Correct answer: A — Dental-follicle-mediated coordination of coronal alveolar bone resorption and apical bone formation
The best answer is A. Intraosseous eruption depends principally on dental-follicle-mediated alveolar bone remodelling: osteoclast activity creates a coronal eruption pathway, while coordinated bone formation occurs around and apical to the moving tooth. Root development commonly accompanies eruption but is neither necessary nor sufficient to provide the primary eruptive force, so B is incorrect. Periodontal-ligament traction may contribute particularly after emergence, but it is not the sole mechanism during the intraosseous phase, excluding C. Tongue pressure can influence tooth position after emergence but does not initiate eruption through bone. Expansion of the pulp chamber does not generate an eruptive force. The mechanism remains multifactorial, but dental-follicle-directed bone remodelling is the best-supported principal process.
Reference: Chen J et al. Abnormal dental follicle cells: A crucial determinant in tooth eruption disorders (Review). Molecular Medicine Reports. 2024;30(3):168. https://pubmed.ncbi.nlm.nih.gov/39027997/