Medical MCQs

5099 MCQs  (Page 66 of 510)

Asbestos liner is used in a casting ring to________________?
A. Facilitate venting of the mold
B. Retard the heating of the investment
C. Permit expansion of the world
D. All of the above
Air bubbles formed on the surface of casting is probably due to________________?
A. Improper casting pressure
B. Improper heating of the investment
C. Improper angulation of sprue
D. Improper wetting of the wax pattern by the investment
Suck back porosity is due to_________________?
A. Attached impurities on undersurface of casting
B. Hot spot
C. No rapid cooling
D. Inadequate melting temperature
Silver plated dyes use an electrolytic bath of_______________?
A. Silver fluorides
B. Silver cyanide
C. Silver bromide
D. Silver iodide
Which of the waxes are derived from the lignite_________________?
A. Paraffin wax
B. Inlay wax
C. Microcrystalline wax
D. Montan wax
Stages of annealing in order_________________?
A. Recovery recrystallization grain growth
B. Recrystallization recovery, grain growth
C. Grain growth recrystallization recovery
D. Melting point, grain growth, recrystallization
Nickel is added to wrought gold alloys as______________?
A. Strengtherner
B. Hardener
C. Whitens the alloy
D. Scavenger
During soldering, the solidus temperature of the filler material should be_____________?
A. Greater than the substrate material
B. Lesser than the substrate material
C. Equal to the substrate material
D. Temperature not relevant