Restorative & Materials · single question
Abfraction lesions are PRIMARILY caused by:
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Correct answer: A. Eccentric occlusal loading and flexural stress
Abfraction is caused by eccentric occlusal forces creating flexural stress at the cervical region — the tooth flexes under load, causing micro-cracks and tissue loss at the fulcrum point.
- A. ✅ CORRECT – Abfraction: eccentric occlusal loading → cervical flexural stress → wedge-shaped cervical notch.
- B. ❌ Erosion from acid causes smooth, broad cervical lesions.
- C. ❌ Abrasion from toothbrushing creates rounded, dish-shaped lesions.
- D. ❌ Attrition affects occlusal/incisal surfaces.
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