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.Management Sciences
Category: Dental Materials
The particle size in microfilled composites is_____________?
A. 0.05 to 0.04mm
B. 0.5 to 1.0 microns
C. 0.01 to 0.1 microns
D. 0.3 to 0.4mm
Composite resins in comparison to acrylic have_______________?
A. Low compressive strength
B. High abrasive resistance
C. High water absorption
D. High polymerization shrinkage
Which of the following best describes the working time of elastomeric 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. Just before the start of appearing elastic properties of impression material
D. Loss of luster of impression material
What is the working time of amalgam?
A. One to two minutes
B. Three to four minutes
C. Five to six minutes
D. Seven to eight minutes
Inorganic phase of the composites aid in_______________?
A. Increasing the mechanical strength
B. Decreasing the coefficient of thermal expansion
C. Reducing the polymerization shrinkage
D. All of the above
Tear strength for impression material is highest for__________?
A. Condensation silicone
B. Alginate
C. Polysulfide
D. Addition silicone
Agar syringe material can be used with/as______________?
A. Agar
B. Alginate impression material
C. Both of the above
D. Primary impression
Subsurface porosity is due to_____________?
A. Thermal changes
B. Thickness of the resin
C. Lack of temperature
D. Packing past the dough stage
Polysulfide material is routinely not recommended because of_______________?
A. Unpleasant odor and taste
B. Low accuracy
C. Least permanent deformation
D. Highest curing shrinkage
PH of which cement remain below 7 even after 1 month after insertion into the cavity ?
A. Glass Ionomer Cement
B. Zinc Phosphate
C. Resin cement
D. Silicate cement
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