Restorative & Materials · single question
In composite resin, decreasing the size of filler particles primarily results in:
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Correct answer: D. Smoother surface finish and better polish
- A. Abrasion resistance is related to filler CONTENT (volume percent) and hardness, not primarily filler size. Macrofills (larger particles) actually have higher individual particle hardness but rougher surface; nanofills have better overall wear resistance due to smooth polish.
- B. Compressive strength is primarily related to filler content (higher filler % = stronger), not particle size alone.
- C. Curing time is affected by photoinitiator concentration, light intensity, and thickness — not primarily filler size.
- D. Decreasing filler particle SIZE (microfills, nanofills) results in a SMOOTHER SURFACE FINISH and better POLISHABILITY. Smaller particles allow a more even, polishable surface. This is why microfill and nanofill composites are preferred for anterior esthetic restorations where high polish is critical.
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