A. Paraffin wax
B. Inlay wax
C. Microcrystalline wax
D. Montan wax
Which of the waxes are derived from the lignite_________________? Read More »
Dental Materials, Medical Mcqs, Metallurgy A. Silver fluorides
B. Silver cyanide
C. Silver bromide
D. Silver iodide
Silver plated dyes use an electrolytic bath of_______________? Read More »
Dental Materials, Medical Mcqs, Metallurgy A. Attached impurities on undersurface of casting
B. Hot spot
C. No rapid cooling
D. Inadequate melting temperature
Suck back porosity is due to_________________? Read More »
Dental Materials, Medical Mcqs, Metallurgy 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
Air bubbles formed on the surface of casting is probably due to________________? Read More »
Dental Materials, Medical Mcqs, Metallurgy A. Facilitate venting of the mold
B. Retard the heating of the investment
C. Permit expansion of the world
D. All of the above
Asbestos liner is used in a casting ring to________________? Read More »
Dental Materials, Medical Mcqs, Metallurgy A. Surface hardness
B. Strength
C. Proportion limit
D. Corrosion resistance
Which of the following decrease with strain hardening______________? Read More »
Dental Materials, Medical Mcqs, Metallurgy A. Increasing the mould metal temperature difference
B. Increasing the flow of molten metal
C. Flaring the point of the sprue attachment
D. All of the above
Suck back porosity in the casting can be eliminated by________________? Read More »
Dental Materials, Medical Mcqs, Metallurgy A. Carbon
B. Molybdenum
C. Chromium
D. Nickel
A. Silica
B. Quartz
C. Cristobolite
D. Calcium sulphate monohydrate
Binder used in Gypsum investment is_________________? Read More »
Dental Materials, Medical Mcqs, Metallurgy A. Unreliable spring back
B. low spring back
C. Minimal spring back
D. None of the above
Nickel-Titanium alloy has__________________? Read More »
Dental Materials, Medical Mcqs, Metallurgy