dental materials MCQs – Page 29

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

dental materials Mcqs

561. Advantage of minimum mercury technique or Eames technique is all Except________________?
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A. Needs no squeezing of excess mercury

B. High strength

C. Sets quickly

D. Greater plasticity and adapts well to cavity walls

562. For porcelain fused to metal crown, the porcelain should have ______________?
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A. Linear coefficient of thermal expansion less than that of metal

B. High fusion temperature

C. High fusion expansion

D. Linear coefficient of thermal expansion more than that of metal

563. According of ADA specification No or number 1, the minimum compressive strength for silver amalgam filling aftr one hour should be________________?
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A. 510 Mpa

B. 140 Mpa

C. 80 Mpa

D. 260 Mpa

564. Chronic mercury toxicity results from_____________?
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A. Mercury vapour

B. Ingestion while removing old amalgam

C. All of the above

D. Skin contact

565. Eugenol may be replaced in the zinc oxide eugenol cement by______________?
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A. Phosphoric acid

B. Ortho-ethoxy acid

C. Acetic acid

D. Alginic acid

566. The pure form of gold used in dentistry is known as___________________?
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A. Class I casting gold

B. Class IV casting gold

C. Cohesive gold

D. Non cohesive gold

567. The dual cure cements should not be used with light transmitting prostheses thicker than____________?
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A. mm

B. 1.5 mm

C. 2.5 mm

D. mm

568. The dental amalgam is most resistant to________________?
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A. Shear stress

B. Tensile stress

C. Compressive stress

D. Impact stress

569. Coefficient of thermal expansion of metal-ceramic alloys is________________?
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A. Same as porcelain

B. More than porcelain

C. Less than porcelain

D. More than or equal to porcelain but not less

570. The effect of trituration on strength in an amalgam restoration depends on______________?
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A. All of the above

B. Amalgam alloy

C. Speed of amalgamator

D. Trituration time

571. pH of fully set zinc phosphate______________?
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A. 5-Apr

B. 4-Mar

C. 6-7

D. 8-Jul

572. The ideal temperature of water bath for softening fluid wax is about________________?
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A. 51 to 54 degree C

B. 70 to 75 degree F

C. 51 to 54 degree F

D. 70 to 75 degree C

573. Which one of the following restorative materials is having coefficient of thermal expansion close to that of tooth enamel and dentin ?
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A. Type II Glass ionomer cement

B. Pure gold

C. Microfilled composite resins

D. Silver amalgam

574. Which is true regarding lathe cut silver alloy_______________?
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A. Requires least amount of mercury

B. Achieves lowest compressive strength at 1 hr.

C. Has tensile strength both at 15 min & 7 days comparable to high copper unicompositional alloy

D. Has low creep

575. Pyroplastic flow of porcelain is due to___________________?
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A. High temperature during glazing

B. Improper condensation

C. High firing temperature

D. Low temperature during glazing

576. Secondary caries is least likely seen with_______________?
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A. Polycarboxylate

B. Silicate cement

C. GIC

D. Zinc phosphate

577. All of the following are true for traditional solution liner, except_________________?
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A. It is not necessary in moderately deep cavities under glass ionomer restoration

B. Do not provide thermal or electric insulation

C. Protect the pulp from reaction products leaching out of restoration

D. Have Film thickness of 1 50 microns

578. Well premeasured capsules of amalgam can release mercury vapour during_______________?
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A. Mulling

B. Condensation

C. Trituration

D. Carving

579. In amalgam alloy which acts as oxygen scavenger_____________?
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A. Ag

B. Zn

C. Cu

D. Pd

580. Fluoride rich materials include ?
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A. Silicate cement

B. Polycarboxylate cement

C. Glass ionomer cement

D. All of the above

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