dental materials MCQs – Page 32

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

dental materials Mcqs
621. In non zinc containing dental amalgam alloy the percentage of zinc present is______________?
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A. Less than 0.01%

B. None of the above

C. Less than 0.1%

D. Less than 0.02%

622. Amalgam achieves 70% of the strength by____________?
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A. 4 hours

B. 16 hours

C. hours

D. 8 hours
623. Co-efficient of Thermal exansion of amalgam is______________?
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A. 6.6 a (ppm k-1)

B. 11.4 a (ppm k-1)

C. 25.0 a (ppm k-1)

D. 14.0 a (ppm k-1)

624. For dental amalgam, the elastic modulus and tensile strength is______________?
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A. 350 Gpa and 10 120 Mpa

B. 40 Gpa and 60 100 Mpa

C. 21 Gpa and 27 55 Mpa

D. 360 Gpa and 125 130 Mpa

625. The cavity varnish applied reduces post operative sensitivity in amalgam restoration by____________?
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A. Decreasing conduction of heat to pulp

B. Minimize marginal leakage around restoration

C. By altering the chemical composition of restoration materials

D. By preventing penetration of corrosion products into the dentinal tubules

626. Which of the following is most important in strength ZOE_____________?
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A. Speed of mixing

B. Liquid powder ratio

C. Addition of few drops of water

D. Temperature of mixing stab

627. Which of the following cements have anti cariogenic properly________________?
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A. Calcium Hydroxide

B. Zinc silicophosphate

C. Zinc phosphate

D. ZOE