Restorative & Materials · single question
Difference between abrasion and abfraction?
Show answer and explanation
Correct answer: B. Shape
- A. Both can occur at the cervical region, so location alone doesn't distinguish them.
- B. Correct (keyed). Abrasion tends to be broad/saucer-shaped from mechanical wear; abfraction is a sharp wedge/V-shaped notch from occlusal flexure — the shape differs.
- C. Size is not the defining difference.
- D. Color is not the defining difference.
Note: The deepest distinction is cause (mechanical wear vs. occlusal-stress flexure); on this exam the keyed answer is shape.
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