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.Management Sciences
Category: Dental Materials
Syneresis seen in hydrocolloid gel is______________?
A. Seen as water loss
B. Water absorption
C. Shrinkage
D. Gelation
Reduction in the fusion temperature of dental gold casting alloys is caused by presence of______________?
A. Platinum
B. Copper
C. Silver
D. Gold
Gases dissolved in molten metals are liberated when cooled giving rise to________________?
A. Suckback porosity
B. Gas inclusion porosity
C. Localized shrinkage porosity
D. Microporosity
Which of the following fuel gases is the best choice of heat source to carry out soldering process ?
A. Propane
B. Acetylene
C. Natural gas
D. Hydrogen
Corrosion of stainless steel is due to formulation of_________________?
A. Chromium carbide
B. Carbon carbide
C. Iron carbide
D. Nickel carbide
Which of the following component acts as an accelerator in ZOE impression paste ?
A. Zinc Sulphate & Zinc chloride
B. Zinc chloride & Eugenol
C. Zinc Sulphate & Eugenol
D. Glycerin
Immediate pouring of impressions is most critical in_____________?
A. Condensation polysillicon
B. Addition Polysilicon
C. Polyether
D. A and B
The maximum shrinkage during firing proces in ceramic occurs in__________________?
A. High Bisque stage
B. Low Bisque stage
C. Medium Bisque stage
D. Fusion stage
The Zinc oxide-eugenol impression pastes harden by________________?
A. Chemical reaction
B. Cold
C. Heat
D. Pressure
Sub surface porosity can be decreased by_______________?
A. Decreasing the sprue length
B. Decreasing the sprue thickness
C. Increasing the melting temperature
D. Increasing the mould temperature
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