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.Management Sciences
Category: Dental Materials
Radio opacity to composite resins is rendered by_______________?
0
A. Silica glass
B. Organic matrix
C. Barium glass and strontium glasses
D. Fluoride particles
Advantage of zinc phosphate over GIC is______________?
A. High compressive strength
B. Tensile strength
C. High modulus of elasticity
D. Diametral strength
Which of the following constituents of amalgam alloy decreases expansion____________?
A. Copper
B. Zinc
C. Silver
D. Tin
Austenite is an alloy of iron of and carbon with the iron in______________?
A. Alpha form
B. Beta form
C. Gamma form
D. None of the above
Which one of the following dental cement accelerates the formation of reparative dentin ?
A. Eugenol
B. Calcium Hydroxide
C. Zinc oxide
D. Silica
Which of the following cements is contraindicated in mouth breathers_______________?
A. Silicate
B. ASPA
C. Polycarboxylate
D. Zinc phosphate
Which phase provides maximum strength in hardened mercury/silver alloy ?
A. Silver / Mercury phase
B. Silver / Tin phase
C. Tin / Mercury phase
D. Zinc / Mercury phase
The porosity formed due to simultaneous nucleation of solid grains and gas bubbles at the first moment that metal freezes at the mold walls is called__________?
A. Pinhole porosity
B. Gas inclusion porosity
C. Micro porosity
D. Subsurface porosity
Tempering of steel cause________________?
A. Increases its toughness
B. Increases hardness
C. Increase ductility
D. decreases its toughness
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