The main advantage of composites over unfilled direct filling resin is their_____________?
Correct answer: D. Lower thermal co-efficient of expansion
- A. Higher solubility in saliva
- B. Lower modulus of elasticity
- C. Esthetic excellence
- D. Lower thermal co-efficient of expansion
Explanation
Inorganic filler particles reduce the resin matrix's thermal expansion, making the composite behave more like tooth structure and reducing marginal stress. Composites also improve strength and wear resistance, whereas higher solubility and lower stiffness are disadvantages.
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