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Composites vs unfilled direct filling resin

# The main advantage of composites over unfilled direct filling resin is their: (KAR -97)
a) Higher solubility in saliva
b) Lower modulus of elasticity
c) Esthetic excellence
d) Lower thermal co-efficient of expansion


The correct answer is D. Lower coefficient of thermal expansion.

Advantages of composites (filled resins) over unfilled resins are lower co-efficient of thermal expansion. Low polymerization shrinkage, low water absorption and high abrasive resistance.

On the other hand, composites have less colour stability and do not take the smooth finish as that of unfilled resins.

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