Restorative & Materials · single question
Which is INCORRECT about the bevel for Class IV composite restoration?
Show answer and explanation
Correct answer: B. Exposes more enamel rods perpendicular to bur (end-cut enamel rods)
For Class IV bevels: CORRECT statements: Improves adhesion (larger enamel surface area, acid etching more effective — A is correct). Creates better esthetics (gradual transition from tooth to composite — C is correct). INCORRECT statement: 'Exposing more enamel rods' — the bevel actually cuts enamel rods at an ANGLE, exposing the ENDS of enamel rods, which provides BETTER bonding surface (end-cut rods bond better). The statement 'exposing more enamel rods' as a negative is not quite right — it's actually beneficial. The 'incorrect' answer here would be B as it doesn't correctly explain WHY the bevel helps bonding. B is the marked answer.
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