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Osteoclast-mediated tooth movement — NDEB AFK MCQ

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EasyOrthodonticsOsteoclast-mediated tooth movementNDEB AFK

A patient asks why orthodontic force can move teeth through bone. The clinician explains that pressure areas adjacent to the periodontal ligament show bone resorption. What is the most likely cause/mechanism?

Educational content. Not a substitute for clinical judgement or local policy.

Reveal the answer and explanation

Correct answer: A — Osteoclast activation on the pressure side

Orthodontic tooth movement depends on bone resorption by osteoclasts on pressure sides and bone formation on tension sides. Cementum growth alone does not explain tooth movement through alveolar bone. The pearl is that excessive force can cause hyalinisation and root resorption rather than efficient movement.

Reference: Orthodontic biology reference texts; NDEB KSAs 2024