dental materials MCQs – Page 30

Practise focused dental materials questions with marked answers for exam preparation and subject revision.

dental materials Mcqs
581. Electrolyte used for plating copper dies is________________?
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A. Ionic copper

B. Silver cyanide

C. Acidic copper sulphate

D. Copper cyanide

582. All of the following is used as accelerator in zinc oxide eugenol cement except_______________?
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A. Bromoglycerine

B. Zinc acetate dehydrate

C. Acetic acid

D. Calcium chloride

583. Percentage of zinc in ZOE cement is__________________?
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A. 70%

B. 90%

C. 80%

D. 60%

584. The cement Which is least soluble in oral cavity______________?
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A. Glass ionomer

B. Silico-Phosphate cement

C. Resin cement

D. Polycarboxylate cement

585. Setting time of Amalgam is best controlled by _______________?
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A. Altering Hg-Alloy ratio

B. Trituration time

C. Using spherical particles

D. Lathe cut alloy

586. In non-eugenol pastes the constituents are mixed in______________?
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A. None of the above

B. Ethyl alcohol

C. Phosphoric Acid

D. Benzoic acid
587. Which of the following statements about high copper silver alloy compared to conventional alloy is not true ?
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A. Its edge strength is greater

B. It has poor tarnish and corrosion resistance

C. It has increased tensile and compressive strength

D. Mercury content in the final restoration is less

588. Which one of the following is not an objective of trituration ?
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A. Keep the amount of gamma-1 or gamma-2 matrix crystals to maximum

B. Achieve a workable mass of amalgam in minimum time

C. Pulverize pelletes into particles to aid in attack by mercury

D. Remove oxides from powder particle surface

589. Porcelain is best fired__________________?
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A. Under air compression

B. In open air

C. When several layer are fired simultaneously

D. Under minimum pressure

590. Crocus cloth is________________?
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A. Rouge

B. Emery

C. Pumice

D. Garnet

591. The cohesive gold used as bulk filler is_____________?
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A. Spherical gold

B. Electra alloy

C. Gold foll

D. Mat gold
592. By increasing the percentage of which metal, the strength and hardness of amalgam increases_____________?
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A. Zn

B. Ag

C. Cu

D. Hg

593. Which of the following acts as accelerator in Zinc oxide eugenol______________?
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A. Zn(OH)2 + ZnO

B. ZnCl2 + ZnSO2

C. Eugenol + ZnO

D. ZnCl2 + Eugenol

594. Ethoxy benzoic acid increases the strength and solubility of the cement______________?
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A. Silicate cement

B. Zinc phosphate cement

C. Zinc oxide eugenol

D. Polycarboxylate cement

595. Which cement base has the highest modulus of elasticity ?
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A. Glass inomer cement

B. Zinc polycarboxylate

C. Polymer reinforced ZOE cement

D. Zinc phosphate
596. Frozen slab technique is applicable to_____________?
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A. Zinc oxide Eugenol cement

B. Glass Ionomer cement

C. Zinc phosphate cement

D. Resin cement

597. Direct filling gold formed by electrolytic precipitation is called by all the terms EXCEPT______________?
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A. Sponge gold

B. Granular gold

C. Mat gold

D. Crystalline

598. Minimum thickness for type I zinc phosphate cement should be_______________?
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A. 25 microns

B. 15 microns

C. 50 microns

D. 100 microns

599. Machineable glass ceramic is________________?
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A. Infusium

B. Decor MGC

C. Cerestore

D. Leucite

600. The percentage of copper in high copper alloy is______________?
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A. 0-6%

B. 20-30%

C. 13-30%

D. 10-12%