dental materials MCQs – Page 26

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

dental materials Mcqs

501. Chemical tempering in porcelains is done to interrupt crack propagation by______________?
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A. Dispersion of crystalline phase

B. Inducing residual compressive strength

C. All of the above

D. Transformation toughening

502. High strength amalgam is achieved by_____________?
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A. Maximum matrix and minimum alloy phase

B. Minimum matrix and maximum alloy phase

C. Minimum alloy phase

D. Maximum matrix phase

503. Copper content in low copper amalgam is________________?
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A. 29%

B. 12-30%

C. 19%

D. 6%

504. Porosity in porcelain can be prevented by_______________?
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A. Rapidity of firing

B. All of the above

C. High firing temperature

D. Thoroughness of condensation

505. Absorption of mercury in the human body occurs least from_____________?
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A. Gastro-intestinal Track

B. Lungs

C. Kidneys

D. Skin

506. What is the most frequently used restorative material ?
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A. Gold

B. Composite

C. Silicate

D. Amalgam

507. Amalgam achieves 70% of the strength by____________?
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A. 16 hours

B. 4 hours

C. 8 hours

D. hours

508. All of the following is used as accelerator in zinc oxide eugenol cement except_____________?
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A. Acetic acid

B. Calcium chloride

C. Zinc acetate dehydrate

D. Bromoglycerine

509. The maximum shrinkage during firing proces in ceramic occurs in__________________?
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A. Low Bisque stage

B. High Bisque stage

C. Fusion stage

D. Medium Bisque stage

510. The melting point of titanium is __________ degree celsius?
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A. 1056

B. 1886

C. 1668

D. 1560

511. Which is the cement with adhesive properties ?
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A. Zinc oxide eugenol

B. Zinc polycarboxylate

C. SIlicate

D. Glass ionomer

E. Both B & D

512. Water of reaction needed to react completely with 100 g of calcium sulphate hemihydrates to convert it to calcium sulphate dihydrate______________?
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A. 22.2ml

B. 18.6ml

C. 30.4ml

D. 45.3ml

513. In spherical alloys as compared to lathe cut____________?
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A. Less condensing force is required

B. More condensing force is required

C. Both require same condensing force

D. Manipulation is easy

514. Compared with dental alloys, CERAMICS show____________________?
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A. Low esthetic value

B. Susceptibility to brittle fracture

C. High hardness

D. High ductility

515. Which component of zinc oxide-eugenol cement gives its strength ?
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A. Rosin

B. Zinc oxide

C. Zinc acetate

D. Oil of cloves

516. MEchanism of adhesion of GIC restoration with tooth surface is by mean of ______________?
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A. C=C double bond

B. Polymer chains

C. Chelates with Metal Ions

D. Carboxyl group

517. The tow cements which hold with the tooth are_______________?
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A. GIC and polycarboxylate

B. GIC and silicate

C. ZnPO4 and silicate

D. GIC and ZnPO4

518. The main components is sillicophosphate cement________________?
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A. Silicate and GIC

B. Zinc phosphate and SIlicate

C. Zinc phosphate and GIC

D. ZOE and Silicate

519. The opacity in ceramics is achieved by adding_______________?
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A. Titanium oxide

B. Silica

C. Copper oxide

D. Boric oxide

520. Increased amount of powder in zinc phosphate cement mixture will cause_______________?
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A. Decreased strength

B. Decreased solubility

C. Decreased film thickness

D. Increased setting time

Showing 501 to 520 of 627 mcqs