MCQs on Amalgam restoration

1. Conventional dental amalgam alloy contains:
a. Silver, tin, copper and zinc
b. Silver , mercury, copper and zinc
c. Silver, tin , palladium and zinc
d. Silver, copper, iridium and mercury

2. Contamination of Zinc containing amalgam by moisture during trituration or condensation:
a. Causes marked expansion
b. Increases the setting Time
c. Results in a sharp decrease in flow
d. Has no appreciable effect on amalgam

3. Advantages of  pin-retained amalgam restoration are:
a. Tooth preparation is more conservative
b. Restoration can be completed in one visit
c. Retention form is improved by the use of pins
d. All of the above

4. In which class of cavities is amalgam contraindicated ?
a. Class 1
b. Class 2
c. Class 4
d. Class 5

5. When a posterior occlusal amalgam makes multiple contacts with an occluding tooth surface, behaves as though it is in:
a. Flexion
b. Compression
c. Shear
d. Diametral compression

6. A finished and polished amalgam will:
a. Tarnish with time
b. Not tarnish and corrode easily
c. Show secondary caries
d. Do none of the above

7. Which of the following restorative material are likely to be eliminated in near future?
a. Amalgams
b. Glass ionomer
c. Porcelain
d. Composites

8. Average mercury content in well condensed amalgam should not exceed:
a. 30%
b. 40%
c. 50%
d. 60%

9. All are required for the satisfactory bonding of an amalgam restoration in a badly broken molar except:
a. Resistance form
b. Mechanical retention
c. Enamel and dentin conditioning
d. Pin retention

10.The pins in an amalgam restoration serve to:
a. Increase strength
b. Increase retention
c. Increase resistance of fracture
d. All of the above

11. What appears to be the principle problem with the use of gallium  alloys as an amalgam substitute?
a. Less compressive strength
b. More expansion which leads to tooth fracture
c. Poor biocompatibility
d. Loss of corrosive products

12. The largest component of amalgam alloy is:
a. Silver
b. Tin
c. Zinc
d. Copper

13. During amalgamation, trituration is done to:
a. Dissolve the alloy in mercury
b. Coat the alloy particles with mercury
c. Remove the excess mercury from amalgam
d. Dissolve Hg in alloy