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.Management Sciences
Category: Dental Materials
Disadvantage of having a short sprue is________________?
A. Rapid solidification of metal
B. No place for reservoirs
C. Incomplete evacuation of gases
D. Difficulty in removing casting from investment
In method of firing: A shorter firing period at a higher temperature is considered better_______________?
A. A large time period at a lower temperature is preferred
B. A long firing period at a very high temperature is preferred
C. A short firing period at a very low temperature is preferred
D. none of these
Dispersion of crystalline phase to strengthen ceramics results in_________________?
A. dispersed porcelain
B. Glazed porcelain
C. aluminium porcelain
D. All of the above
All of the following statements about an alginate impression are EXCEPT________________?
A. It should be rapidly displaced from the mouth
B. It may exhibit fluid exudates on the surface as a result of imbibition of water
C. It will take up water and expand if kept wet
D. It will shrink as a result of syneresis
The cement Which is least soluble in oral cavity______________?
A. Glass ionomer
B. Resin cement
C. Polycarboxylate cement
D. Silico-Phosphate cement
The polymerization of self-curing resin takes faster in______________?
A. Cold water
B. Hot water
C. Under pressure
D. In vaccum
Balanced stone is dental stone_______________?
A. Which undergoes rapid expansion
B. In which accelerators or retarders have been added according to need
C. In which amount of water of hydration is controlled
D. In which the crystals are all of uniform size
Which of the following increases castability of base metal alloys________________?
A. Tin
B. Beryllium
C. Molybdenum
D. Carbon
The rapid decrease in tensile strength and increase in ductility of a wrought metal is seen in which stage of annealing ?
A. Recovery stage
B. Recrystallisation stage
C. Grain growth stage
D. All of the above
In reversible hydrocolloid the property by which the transformation from sol to gel and gel to sol is a function of the_____________?
A. Concentration of filler and plasticizer
B. Percentage composition by weight of water
C. Concentration of potassium sulphate
D. Temperature
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