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.Management Sciences
Category: Dental Materials
Quartz in investment material is added for_______________?
A. Strength
B. Expansion components for casting shrinkage
C. Decrease strength
D. Contraction
Syneresis is associated with______________?
A. Hydrocolloids
B. Elastomers
C. Zinc oxide eugenol
D. Plaster of paris
The setting of zinc phosphate is accelerated by_____________?
A. Adding a drop of water
B. Increasing mixing time
C. Cooling the slab
D. Adding a drop of oleic acid
Porcelain denture teeth________________?
A. Have a higher coefficient of thermal expansion than acrylic teeth:
B. Have a lower abrasion resistance than enamel
C. Should be used where the inter dental clearance is small
D. Have a higher abrasion resistance than gold
Modiffiers are added to gypsum mainly to_______________?
A. Modify setting time
B. Modify setting expansion
C. Modify strength
D. Decrease the porosity
The cohesive gold used as bulk filler is_____________?
A. Electra alloy
B. Mat gold
C. Spherical gold
D. Gold foll
Which of the following fuel gases used for soldering, has the highest heat content______________?
A. Hydrogen
B. Natural gas
C. Acetylene
D. Propane
Setting time of Amalgam is best controlled by _______________?
A. Using spherical particles
B. Lathe cut alloy
C. Altering Hg-Alloy ratio
D. Trituration time
Which of the following best describes the working time of impression material ?
A. After the start of appearing elastic properties of impression material
B. Just after the start of appearing elastic properties of impression material
C. The time for start of mixing till just before the start of appearing elastic properties of impression material
D. Loss of lusture of impression material
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