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.Management Sciences
Category: Dental Materials
The effect of zinc oxide-eugenol on the pulp ?
A. Is irritating
B. Encourages pulpal fibrosis
C. Is sedating
D. Has no effect
About polymerization shrinkage of composite all are true, except______________?
A. Polymerization shrinkage is greater if bonded surface area is lesser than unbounded surface area
B. Polymerization shrinkage is high if within the enamel margins
C. Acid etching and priming will decrease polymerization shrinkage
D. Microleakage can occur because of polymerization shrinkage
Dentin bonding agents usually contain_____________?
A. Only Hydrophobic component
B. Only Hydrophilic component
C. Hydrophobic and hydrophilic component
D. Lyophillic and lyophobic component
The contraction of gold alloy on solidifying is approximately_____________?
A. 0.4%
B. 1.4%
C. 2.4%
D. 3.4%
Cobalt-Chrominum alloys contains_______________?
A. 30% cobalt and 60% chrominum
B. 60% cobalt and 30% chrominum
C. 1% palladium
D. 20% gold
Which is true regarding lathe cut silver alloy_______________?
A. Requires least amount of mercury
B. Achieves lowest compressive strength at 1 hr.
C. Has tensile strength both at 15 min & 7 days comparable to high copper unicompositional alloy
D. Has low creep
The role of magnesium chloride in zinc oxide eugenol impression paste_________________?
A. Retarder
B. Modifier
C. Plasticier
D. Accelerator
Within an hour after cementation of cast gold onlay patient complains of shooting pain every time the teeth comes together Most probable explanation is ______________?
A. Supracocclusion of restoration
B. Retained cement in gingival sulcus
C. Excess acid in mix
D. Galvanic current caused by gold onlay occluding with a large restoration
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