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Restorative & Materials · single question

Which statement about placing an enamel bevel on a Class IV composite preparation is INCORRECT?

  1. It increases the total surface area available for bonding
  2. It improves bonding by exposing the ends of more enamel rods
  3. It improves esthetics by blending the transition between composite and tooth
  4. It increases the fracture resistance of the restoration
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Correct answer: D. It increases the fracture resistance of the restoration

  • A. A 45-degree bevel measurably increases the bondable enamel surface area.
  • B. Etching enamel rod ENDS produces a far better resin tag pattern than etching rod sides, which is precisely why the bevel improves bond strength.
  • C. The gradual thickness transition scatters light and disguises the margin, which is the main esthetic reason to bevel an anterior restoration.
  • D. CORRECT — this is the incorrect statement. A bevel does NOT strengthen the restoration. It actually creates a thin feather edge of composite at the margin, which is the region most vulnerable to chipping. Retention and esthetics improve; bulk fracture resistance does not.

Note: Bevel anterior (Class III, IV, V) for esthetics and bond. Do NOT bevel posterior occlusal margins — thin composite in a load-bearing area chips, and the enamel rod orientation there does not reward it.

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