dental materials MCQs – Page 24

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

dental materials Mcqs
461. What is the working time of zinc polyacrylate cement ?
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A. 4 Minutes

B. 3 Minutes

C. 2 Minutes

D. 1 Minutes

462. In porcelain metal elements are embedded in the matrix of________________?
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A. Plastic

B. Resin matrix

C. Rubber matrix

D. Glass
463. Which of the following characterizes the silicate cement______________?
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A. Chemically attaches to the tooth structure

B. It produces thinnest film surface

C. It is pulpal irritant

D. It is highly cariogenic

464. Mercury intoxication in dental office mainly results from____________?
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A. Direct contact with the mercury

B. None of the above

C. Inhalation of mercury vapours

D. Ingestion of mercury

465. Age hardening is a process done at______________?
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A. Heating up to 200 450C for 15 30 min and quenching in water

B. Heating above 700C for 30 min and quenching in water

C. Heating at 700C for 1 hour and quenching in water

D. Heating at 700C for 10 15 min and quenching in water

466. Mercury rich condition in a slow setting amalgam alloy system in a resoration in______________?
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A. Merginal damage

B. All of the above

C. Accelerated corrosion

D. Fracture of the restoration

467. Which of the following are characteristic feature of high copper amalgam alloy ?
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A. Less marginal #

B. Low compressive strength

C. High creep

D. High marginal breakdown

468. What is the recommended for condensation of dental amalgam ?
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A. 25 lb

B. 3 pounds

C. 35 pounds

D. 15 lb

469. Increase in the residual mercury in silver amalgam filling can_____________?
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A. Tarnish and corrosion

B. Cause fracture of the filling

C. Increase the strength

D. Decrease condensation pressure

470. The chief advantage of zinc phosphate cement is its___________?
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A. Good compressive strength

B. Film thickness

C. Lack of irritation

D. Low solubility

471. Super abrasive is________________?
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A. Silicon arbide

B. Aluminum oxide

C. Sand

D. Diamond
472. The material used in its pure form in dentistry is______________?
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A. Gold

B. Silver

C. Amalgam

D. Composite

473. Pitting of direct filling old restoration usually results from_________________?
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A. Improper stepping of condenser point

B. Using contaminated gold foil

C. Poor finished preparation

D. Using small condenser point

474. Which one of the following dental cements does not contain water as part of the composition of the liquid component ?
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A. Zinc silicophosphate cement

B. Zinc oxide equgenol cement

C. Zinc polycarboxylate cement

D. Zinc Phosphate cement

475. The term trituration means____________?
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A. Lysing amalgam alloy

B. None of the above

C. Mixing of amalgam alloy and mercury

D. Removal of excess of mercury

476. The highest mercury concentration in amalgam filling is found_____________?
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A. None of the above

B. In the deepest part of the restoration

C. At the margin of the restoration

D. In the centre of the restoration

477. Condensation shrinkage of porcelain during firing depends on__________________?
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A. Rate of arriving at firing temperature

B. Uniformity of particle size

C. Type of investment used

D. Shape and size of particle
478. Advantage of zinc phosphate over GIC is______________?
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A. Tensile strength

B. High compressive strength

C. Diametral strength

D. High modulus of elasticity
479. Which one of the following dental cement accelerates the formation of reparative dentin ?
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A. Zinc oxide

B. Silica

C. Eugenol

D. Calcium Hydroxide
480. The largest component of amalgam alloy is_____________?
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A. Tin

B. Silver

C. Copper

D. Zinc