dental materials MCQs – Page 22

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

dental materials Mcqs

421. Decrease in creep occurs in_______________?
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A. Under trituration or over trituration of amalgam

B. Decreases with condensation pressure

C. Increase with condensation pressure

D. Cannot be predictable

422. The preferred material for repair of fractured denture base is______________?
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A. Heat curve resin

B. Chemically cure resin

C. Vinyl resin

D. Light cure resin

423. The principle application of zinc phosphate cement is_____________?
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A. As a temporary filling material

B. It has less occlusal wear

C. In final cementation

D. As temporary cementation

424. Which glass ionomer cement develops early resistance to water intake on setting ?
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A. Resin modified glass ionomer cement

B. Reinforced auto care glass ionomer cement

C. Ceramic reinforced glass ionomer cement

D. Compomer

425. Flux used in dental ceramic is________________?
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A. Kaolin

B. Boric oxide

C. Silica

D. Alumina

426. Electralloy is an alloy of________________?
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A. Cobalt and Chromium

B. Gold and Calcium

C. Tin and chromium

D. Gold and Platinum

427. Cohesion of gold foil is an example of______________?
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A. Wedging

B. Atomic attraction and welding

C. Adaptation

D. Annealing

428. PH of polycarboxylate liquid is____________?
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A. 5

B. 8

C. 1.7

D. 7

429. The threshold limit value of mercury exposures is_______________?
0

A. mg / m3

B. 0.05 mg / m3

C. mg / m3

D. mg / m3

430. Amalgam means_____________?
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A. A metallic powder composed of silver, tin, copper and zinc

B. An alloy of two or more metals one of which is mercury

C. An alloy of two or more metals that have been dissolved in each other in the molten state

D. A metallic substances in powder or tablet from that is mixed with mercury

431. Which of the following does not occur in High Copper Amalgam ?
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A. Electrochemical Corrosion

B. Chemical Corrosion

C. Corrosion does not occur at all

D. Penetrating Corrosion

432. Which of the following cements is most kind to pulp ?
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A. Glass ionomer

B. Resin cement

C. Polycarboxylate

D. Silicate

433. Average particle size of powdered gold is________________?
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A. 0.1 um

B. 15 um

C. 30 um

D. 10 um

434. The effect of zinc oxide-eugenol on the pulp ?
0

A. Is irritating

B. Has no effect

C. Is sedating

D. Encourages pulpal fibrosis

435. Which of the following cements is contraindicated in mouth breathers_______________?
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A. Zinc phosphate

B. Polycarboxylate

C. ASPA

D. Silicate

436. The tarnished layer of silver amalgam consists of________________?
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A. Chlorides of tin

B. All of the above

C. Oxides of tin

D. Sulphides of silver

437. Powdered gold is___________________?
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A. Made by milling pure gold ingots

B. Made by electrolytic precipitation

C. Made by beating pure gold at high temperatures

D. Made by a combination of chemical precipitation and atomization

438. Gallium and indium added to Amalgam replace______________?
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A. Tin

B. Zinc

C. Mercury

D. Silver

439. Thickness of luting cement is_____________?
0

A. 60-80?

B. 10-20?

C. 20-40?

D. 1-2?

440. Admixed high copper alloy powder contains_________________?
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A. 9-30% copper

B. 13-20% copper

C. 13-30% copper

D. 9-20% copper

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