The smaller the particle size of composite resin filler, the better the composite's ability to be:

Correct answer: C. Polished to a smooth surface

• A. Class IV restorations (involving incisal angles) require hybrid composites for both strength and esthetics — not specifically the smallest particles.
• B. Dentin bonding is related to adhesive systems, not composite filler size.
• C. Correct. Smaller filler particle size (microfill and nanofill composites) allows for better surface polishing because there are fewer surface irregularities when filler particles are smaller. This is why microfill composites are preferred for anterior esthetics despite lower strength.
• D. Fracture resistance is primarily related to filler loading (total percentage), not particle size alone.