dental materials MCQs – Page 20

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

dental materials Mcqs
381. Rough and irregular surface produced on the impression is because of ?
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A. Improper application of pressure during impression making

B. Presence of moisture in impression area

C. Air incorporated during mixing

D. Too rapid polymerization
382. Suck back porosity in the casting can be eliminated by________________?
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A. Increasing the mould metal temperature difference

B. Flaring the point of the sprue attachment

C. All of the above

D. Increasing the flow of molten metal

383. Most commonly used retarder in gypsum_____________?
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A. K<sub>2</sub> So<sub>4</sub>

B. Citrales

C. Na2 So4

D. Nacl

384. Which of the following fuel gases used for soldering, has the highest heat content______________?
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A. Natural gas

B. Propane

C. Hydrogen

D. Acetylene

385. The rapid decrease in tensile strength and increase in ductility of a wrought metal is seen in which stage of annealing ?
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A. Recrystallisation stage

B. Recovery stage

C. Grain growth stage

D. All of the above

386. Percentage of gold in high noble alloy is______________?
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A. 25%

B. >40%

C. 0%

D. N 25%

387. The base paste of the condensation poly sillicone has a low molecular weight dimethyl siloxane with a terminal-group_______________?
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A. Hydroxyl group

B. Marcaptan group

C. Virryl group

D. Silane group

388. The hygroscopic technique is associated with______________?
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A. Hydrocolloids

B. Silicate

C. Investment

D. Amalgam

389. Advantage of titanium over other base metal alloys_______________?
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A. Low weight

B. Low melting point

C. Low cost

D. Low strength

390. Lenolin is added is ZOE paste to______________?
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A. Accelerate reaction

B. Decrease irritation due to eugenol

C. Decrease flow

D. Increase flow
391. Inelastic impression material is_____________?
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A. Alginate

B. Impression compound

C. Agar-agar

D. Polyether

392. Who was the first person to introduce cast inlay restoration into dentistry ?
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A. Bowen

B. William H Taggart

C. Buonocore

D. G.V. Black

393. Rough and irregular surface produced on the impression is because of_______________?
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A. Due to improper ratio of polymer and monomer

B. Air incorporated during mixing

C. Presence of excessive saliva in impression area

D. Improper application of pressure during impression making

394. Tear strength for impression material is highest for__________?
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A. Alginate

B. Condensation silicone

C. Polysulfide

D. Addition silicone

395. Gelation temparature of agar is between________________?
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A. 20C to 25C

B. 27C to 33C

C. 37C to 50C

D. 55C to 60C

396. The component in very minor quantity in stainless steel that changes the properties to a maximum level is____________?
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A. Chromium

B. Molybdenum

C. Nickel

D. Carbon
397. The solvent flux used for base metal soldering is_______________?
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A. Borax

B. Rouge

C. Fluoride

D. Boric acid

398. In Base metal alloys, Corrosion resistance occurs due to___________________?
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A. High Fusion Temperature

B. Co-efficient of Thermal Expansion

C. Passivity

D. High Molecular Weight

399. Gypsum is used for________________?
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A. Casts

B. Casts and Dies

C. Impressions

D. Die

400. The strength of gypsum prouducts is generally expressed in terms of______________?
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A. Green strength

B. compressive strength

C. Tensile strength

D. Wet strength