Restorative & Materials · single question

Which is INCORRECT about the bevel for Class IV composite restoration?

  1. Improve adhesion
  2. Exposes more enamel rods perpendicular to bur (end-cut enamel rods)
  3. Better esthetic (gradual blend)
  4. Weakens the 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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