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.Management Sciences
Category: Metallurgy
A thinner mix of a gypsum bonded investment will_______________?
A. Produce a smoother casting
B. Decrease setting expansion
C. Increase setting expansion
D. Increase thermal expansion
Which of the following cast gold alloys is used for fabricating partial denture frameworks______________?
A. Type I – Soft
B. Type II – Hard
C. Type III – Hard
D. Type IV – Extra Hard
Which one of the following categories of dental materials has the highest thermal conductivity_________________?
A. Unfilled acrylic plastics
B. Gold alloys
C. Porcelains
D. Zinc phosphate cements
Most biocompatible material in oral cavity is_______________?
A. Platinium
B. Palladium
C. Titanium
D. Gold
The standard perforated tray for us with alginate impression materials may be brought to more customized contour by_______________?
A. Utility wax
B. Base plate wax
C. Beading wax
D. Boxing wax
The castability of chromium-cobait base metal alloys when compared to gold based noble metal alloys is_______________?
A. More
B. Less
C. Equal
D. Depends on the alloy type
Which of the following zones is used for melting alloy during casting______________?
A. Reducing flame
B. Oxidizing flame
C. Green flame
D. All of the above
Stainless steel orthodontic wire can be hardened by________________?
A. Tempering
B. Work hardening
C. Age hardening
D. Precipitation hardening
Glossy smooth margins of a casting are due to_____________?
A. Shrinkage of alloy on cooling
B. Investment breakdown
C. Incomplete wax elimination
D. Incomplete gas elimination
Advantage of titanium over other base metal alloys_______________?
A. Low weight
B. Low cost
C. Low strength
D. Low melting point
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