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dental materials MCQs

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

dental materials Mcqs
1. KHN value of Amalgam is_________________?
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A. 90

B. 343

C. 450

D. 67

2. Which of the following will produce the most rigid restoration for framework of same dimension ?
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A. Partial denture casting gold in hardened condition

B. Wrought alloy

C. Cobalt-chrome alloys

D. Palladium alloys

3. Materials which has high compressive strength and low tensile strength is classified with property of________________?
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A. Brittleness

B. Malleability

C. Ductility

D. Resilient

4. Which of the following procedure is indicated to produce cross-linking in the polymerization of linear chains of acrylic_______________?
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A. Addition of grain refining agents

B. Increasing the amount of heat required for linear polymerization

C. Incorporation of terminating agents

D. Addition of difunctional monomers
5. The elastic of plastic deformation to fracture a material is its_______________?
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A. Youngs modulus

B. Proportional limit

C. Brittleness

D. Toughness
6. Acid-etching is done for_______________?
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A. 60 seconds

B. 90 seconds

C. 120 seconds

D. 30 seconds
7. During polymerisation of acrylic resin, above what temperature benzoyl peroxide form freeradicals_______________?
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A. 50C

B. 60C

C. 25C

D. 37C

8. Radio opacity to composite resins is rendered by_______________?
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A. Barium glass and strontium glasses

B. Silica glass

C. Organic matrix

D. Fluoride particles

9. Apart from composites and ceramics, another material that could be copy milled easily and inexpensively is_________________?
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A. Germanium

B. Chromium

C. Molybdenum

D. Titanium
10. Ability of an orthodontic wire to spring back to its original shape is evaluated by_____________?
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A. Resilience

B. Brittleness

C. Tensile strength

D. Toughness

11. NiTi alloy have_______________?
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A. Shape memory

B. Hyper rigidity

C. Corrosion resistance

D. Weldable properties

12. Etching of dentin does not include_____________?
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A. Exposure of collagen fibers

B. Increases surface energy

C. Opening of dentinal tubules

D. Removal of smear layer

13. Acrylic resins are used for______________?
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A. Denture base

B. All of the above

C. Anterior restorations

D. Temporary bridges

14. Co-efficient of thermal expansion is highest for_____________?
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A. Gold alloy

B. Acrylic resin

C. Silicate cement

D. Amalgam

15. The restoration which shows percolation and shrinkage along the margins is_____________?
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A. Composites

B. Unfilled resins

C. Amalgam

D. Polycarboxylate

16. Space lattice refers to_______________?
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A. Arrangement of atoms

B. Inter atomic movement

C. Arrangement of molecules

D. Inter atomic imbalance

17. A crystal in metal substructure is_______________?
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A. None of the above

B. Stroma

C. Grain

D. Nucleus

18. Denture acrylics contain cross-linking agents mainly to improve their_____________?
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A. Surface hardness

B. Craze resistance

C. Tissue compability

D. Internal color

19. Ductility of a material is a measure of its_______________?
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A. Anealing

B. Cold working

C. Work hardening

D. Grain elongation
20. The most common coupling agents are organic silicon compound called_______________?
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A. Chelane

B. Parabane

C. Silane

D. Ligane