751. The restorative resins currently most popular are the
A. unfilled direct filling, light-curing resins
B. filled polyurethane resins
C. acrylic resins
D.microfilled composite resins
752. The decrease in the marginal leakage of an amalgam restorationis primarily the result of
A. using cavity varnish
B. water sorption
C. expansion of the alloy
D. formation of corrosion products
753. The pH of zinc phosphate cement be-comes neutral in
A. 30-60 minutes
B. 24-48 hours
C. 1 week
D. 4-6 hours
754. Which metals expand on from the molten state?
A. Platinum and palladium
B. Iridium and lead
C. Indium and strontiumFCPS Part 1 Dentistry
D. Bismuth and antimony5: None of the above
755. Sprues can be fabricated from all of the following, except
A. wax
B. resin
C. stainless steel
D. plastic
E. none of the above
756. Wrought gold alloys are used in dentistry primarily as
A. full crowns
B. inlays
C. wires
D. arch bars
E. metal ceramics
757. A Type IV partial denture gold alloy exceeds a base-metal alloy in numerical value in
A. compressive strength
B. casting shrinkage
C. hardness
D. specific gravity
E. modulus of elasticity
758. Heating a gypsum investment to 1000°C will result in the liberation of
A. silver sulfide
B. carbon monoxide
C. hydrogen
D. sulfur dioxide
759. Crystallinity of a polymer will result in an increase in itsFCPS Part 1 Dentistry
A. molding temperature
B. solubility
C. ductility
D. none of the above
760. coupling agents in composite resins act to
A. increase cross-linking
B. bind the matrix together
C. bind the filler together
D. bind the filler to the matrix