dental materials MCQs – Page 25

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

dental materials Mcqs

481. Which of the following bur is used in the preparation of cavity restored with porcelain fused to metal ?
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A. Diamond bur

B. Diamond but for porcelain and carbide bur for metal

C. Carbide bur

D. Stainless steel bur

482. Phenomenon in which porcelain appears different under varying light condition is______________?
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A. Opacification

B. Refractive optics

C. Translucency

D. Metamerism

483. The setting of zinc phosphate is accelerated by_____________?
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A. Adding a drop of oleic acid

B. Increasing mixing time

C. Adding a drop of water

D. Cooling the slab

484. Ceramics fired to metals are processed by_______________?
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A. Machining

B. Slip casting

C. Heat pressing

D. Sintering

485. Polycarboxylate cement is used for_____________?
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A. Leuting

B. Permanent restoration

C. Die material

D. Temporary restoration

486. In a high copper amalgam the phase, which is eliminated is_______________?
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A. Gamma 2

B. Gamma 1 and 2

C. Gamma 1

D. No phase is eliminated

487. High copper dental amalgams are superior to other amalgams because high copper dental amalgems______________?
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A. Are workable at lower Hg-alloy ratio

B. Have less marginal breakdown

C. Have less resistance to tarnish and corrosion

D. Have a higher ratio of tensile to compressive strength

488. Adequate mixing of mercury is indicated by_______________?
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A. Dry Mix

B. Shiny Mix

C. Short Mixing Time

D. None of the above

489. How soon after a moisture contamination does a zinc containing amalgam alloy start expanding________________?
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A. 24 hours

B. 7 days

C. 1-2 days

D. 3-5 days

490. The major component of zinc phosphate cement is_____________?
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A. Zinc

B. Phosphoric acid

C. Zinc oxide

D. None of the above

491. In method of firing: A shorter firing period at a higher temperature is considered better_______________?
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A. A large time period at a lower temperature is preferred

B. none of these

C. A short firing period at a very low temperature is preferred

D. A long firing period at a very high temperature is preferred

492. When selection the colour of cement to use for cementing a porcelain jacket crown, the powder being tested is best mixed with______________?
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A. Glycerin-water solution

B. Only water

C. Alcohol

D. Cement liquid

493. Why GIC is best restorative material in children_____________?
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A. Good marginal integrity

B. High strength

C. It has less occlusal wear

D. It can bond enamel & dentin

494. Which of the following constituents of amalgam alloy decreases expansion____________?
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A. Zinc

B. Tin

C. Copper

D. Silver

495. Moisture contamination of amalgam can lead to_____________?
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A. Delayed expansion

B. increased stresses

C. Shrinkage

D. Marginal breakdown

496. Dynamic creep is the______________?
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A. Continuing alloying between silver-tin alloy and mercury during the life of restoration

B. Deformation of set amalgam during function

C. Spread of amalgam during packing

D. Process whereby alloy is wetted by murcury

497. In type II gold alloys _______ Karat gold is used?
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A. 18 K

B. 22 K

C. 10 K

D. 24 K

498. Discolouration of silver alloy is due to_____________?
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A. Dry corrosion

B. Tarnish and corrosion

C. Wet corrosion

D. Tarnish

499. Outstanding clinical performance of dental amalgam restoration is related to its____________?
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A. Creep

B. Compressive strength

C. Corrosion

D. Tensile strength

500. Greening occuring when porcelains are fired on silver free alloys may be attributed to________________?
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A. Silver ionization by porcelains with high oxygen potential

B. Vaporization of silver from the walls of contaminated furnaces

C. Surface diffusion of silver from the marginal metal

D. More rapid silver diffusion in sodium containing glass

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