dental materials MCQs – Page 28

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

dental materials Mcqs
541. Frozen slab technique of mixing zinc phosphate is used for_______________?
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A. Temporary dressing

B. Cementing crowns

C. cementing orthodontic bands

D. base

542. Porcelain binds to metal in PFM crown by_________________?
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A. Transparency

B. B and C

C. Chemical bond

D. Metallic bind

543. Dispersion of crystalline phase to strengthen ceramics results in_________________?
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A. dispersed porcelain

B. All of the above

C. Glazed porcelain

D. aluminium porcelain
544. Stage recognized in the firing of dental porcelain given below. Which of state is not correct ?
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A. High bisque

B. Low bisque

C. Medium bisque

D. Cold stage bisque
545. Which of the following is the main constituent of porcelain__________________?
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A. Feldspar

B. Kaolin

C. Quartz

D. Clay

546. The carat for Au foil used for restorations is_______________?
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A. 24

B. 20

C. 18

D. 22

547. The most commonly used, most biocompatible and adhesive cement is______________?
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A. Calcium hydroxide

B. Zinc oxide eugenol

C. Glass ionomer

D. Zinc phosphate

548. Which of the following cements is most biocompatible with pulp ?
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A. Zinc oxide eugenol cement

B. Copper cement

C. GIC

D. Zinc phosphate cement

549. When porcelain is basked against metal, it should possess a________________?
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A. Linear coefficient of thermal expansion greater than, but close to that of the metal

B. high fusion expansion

C. high fusion temperature

D. linear coefficient of thermal expansion less than but close to that of metal
550. Strength of zinc phosphate is effected by_______________?
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A. Consistency of mix

B. Alteration of mixing time

C. P:L ratio

D. Temp of glass slab

551. The addition of which of the following can accelerate the setting time of zinc oxide cement_____________?
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A. Zinc sulphate

B. Barium chloride

C. Zinc acetate

D. Barium sulphate

552. Which of the following cements is most irritant to pulpal tissues ?
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A. Polycarboxylate

B. Zinc phosphate

C. Silicate

D. Glass ionomer

553. Compare to conventional amalgams, spherical amalgams_______________?
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A. Have longer setting times

B. Require heavy compection forces

C. None of the above

D. Require more mercury

554. Plaster of paris is mixed in________________?
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A. Plastic bowl

B. Glass bowl

C. Rubber bowl

D. Metal bowl

555. Which of the following phases of dental amalgam has minimum strength____________?
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A. Gamma 3

B. Gamma 1

C. Gamma 2

D. Epsilon 1

556. Cavo surface angle for amalgam resoration is butt joint as____________?
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A. Decreased compressive, increased strength

B. Decreased compressive, decrease tensile strength

C. It increases compresssive and tensile strengths

D. Increased compressive, increased tensile strength

557. The temperature (in F) of the mixing slab for silicate cements should be_____________?
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A. 75 85

B. 55 65

C. 65 75

D. 85 95

558. The average life of silicate cement restoration is______________?
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A. 8 years

B. 4 years

C. 6 years

D. 2 years

559. The solid solution of silver and mercury is called_______________?
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A. B1

B. y

C. y1

D. y2

560. Creep value of which of the following is the highest ?
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A. Creep value of all the above mentioned alloys is same

B. Low copper amalgam alloy

C. Single composition alloys

D. Admix alloy