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.Management Sciences
Category: Dental Materials
Trisodium phosphate added to alginate contributes towards_______________?
A. increasing the working time of alginate impression material
B. Acts as an accelerator
C. Initiating the setting reaction
D. Provides gel strength
For adhesion to be present between solid and liquid________________?
A. Liquid should wet solid surface
B. Mechanical interlocking should be present
C. Should have high contact angle
D. None of the above
Brazilian test is used to determine the ultimates tensile strength of_________________?
A. Ductile materials
B. Flexible materials
C. Brittle materials
D. Malleable materials
Brinnel hardness number of a dental gold alloy is directly proportional to its______________?
A. Tensile strength
B. Elongation
C. Modulus of elasticity
D. Modulus of resilience
Electrolyte used for plating copper dies is________________?
A. Ionic copper
B. Copper cyanide
C. Silver cyanide
D. Acidic copper sulphate
The strain that occurs when a material is stressed to its proportional limit is______________?
A. Resilience
B. Maximum flexibility
C. Toughness
D. Elastic limit
Asbestos liner is used in a casting ring to________________?
A. Facilitate venting of the mold
B. Retard the heating of the investment
C. Permit expansion of the world
D. All of the above
Once triturated, the Dental amalgam should be condensed with in_____________?
A. 5 minutes
B. 6 minutes
C. 3 minutes
D. 15 minutes
Which of the following impression material requires a hardener ?
A. Agar
B. Alginate
C. Elastomers
D. Impression compound
Coefficienty of thermal expansion of tooth enamel is closest to_______________?
A. Slicate cement
B. Composite
C. GIC
D. Polycarboxylate
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