Download MCQs of Vijay Pratab (Dental Materials)

The limited shelf-life of condensation silicones is usually the result of deterioration of which of the following components ?
1: Lithopone
2: Tin component
3: Diurethyl siloxane
4: Platinum salt

 

Ans: 2

2: The restorative resins currently most popular are the
1: unfilled direct filling, light-curing resins
2: filled polyurethane resins
3: acrylic resins
4: microfilled composite resins

 

Ans: 4

3: The decrease in the marginal leakage of an amalgam restoration is primarily the result of
1: using cavity varnish
2: water sorption
3: expansion of the alloy
4: formation of corrosion products

 

Ans: 4

4: The pH of zinc phosphate cement be-comes neutral in
1: 30-60 minutes
2: 24-48 hours
3: 1 week
4: 4-6 hours

 

Ans:2

5: Which metals expand on from the molten state?
1: Platinum and palladium
2: Iridium and lead
3: Indium and strontium
4: Bismuth and antimony
5: None of the above

 

Ans: 4

6: Sprues can be fabricated from all of the following, except
1: wax
2: resin
3: stainless steel
4: plastic
5: none of the above

 

Ans: 5

7: Wrought gold alloys are used in dentistry primarily as
1: full crowns
2: inlays
3: wires
4: arch bars
5: metal ceramics

 

Ans: 3

8: A Type IV partial denture gold alloy exceeds a base-metal alloy in numerical value in
1: compressive strength
2: casting shrinkage
3: hardness
4: specific gravity
5: modulus of elasticity

 

Ans: 4

9: Heating a gypsum investment to 1000°C will result in the liberation of
1: silver sulfide
2: carbon monoxide
3: hydrogen
4: sulfur dioxide

 

Ans: 4

10: Crystallinity of a polymer will result in an increase in its
1: molding temperature
2: solubility
3: ductility
4: none of the above

 

Ans: 1