What is the disadvantage of using composites as restorative material ?

Related Mcqs:

1. Apart from composites and ceramics, another material that could be copy milled easily and inexpensively is_________________?

   A. Molybdenum
   B. Germanium
   C. Titanium
   D. Chromium

2. What is the most frequently used restorative material ?

   A. Silicate
   B. Amalgam
   C. Composite
   D. Gold

3. Why GIC is best restorative material in children_____________?

   A. High strength
   B. Good marginal integrity
   C. It can bond enamel & dentin
   D. It has less occlusal wear

4. The Knoop Hardness Number of Microfilled composite Restorative material ranges from____________?

   A. 50 – 60 KHN
   B. 25 – 35 KHN
   C. 15 – 20 KHN
   D. 40 – 48 KHN

5. A restorative material which has a high proportional limit, compared with one with a lower proportional limit would have________________?

   A. Greater ductility
   B. Greater toughness
   C. A higher modulus of elasticity
   D. A higher modulus of elasticity
   E. More resistance to permanent deformation

6. Inorganic phase of the composites aid in_______________?

   A. Increasing the mechanical strength
   B. Decreasing the coefficient of thermal expansion
   C. Reducing the polymerization shrinkage
   D. All of the above

7. The particle size in microfilled composites is_____________?

   A. 0.05 to 0.04mm
   B. 0.5 to 1.0 microns
   C. 0.01 to 0.1 microns
   D. 0.3 to 0.4mm

8. The main advantage of composites over unfilled direct filling resin is their_____________?

   A. Higher solubility in saliva
   B. Lower modulus of elasticity
   C. Esthetic excellence
   D. Lower thermal co-efficient of expansion

9. The function of the coupling agent in a restorative resin is to allow______________?

   A. Adhesion of resin particles
   B. Bonding between filler crystals
   C. Bonding between filler and resin
   D. Bonding between tooth and resin

10. Which one of the following restorative materials is having coefficient of thermal expansion close to that of tooth enamel and dentin ?

    A. Microfilled composite resins
    B. Pure gold
    C. Silver amalgam
    D. Type II Glass ionomer cement