dental materials MCQs – Page 2

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

dental materials Mcqs
21. Porosity present in a acrylic denture is usually the result of______________?
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A. Insufficient acrylic resin monomer

B. Lack of sufficient pressure applied to flask

C. A prolonged curing cycle

D. Prolonged bench cooling after curing

22. Marginal leakage related to temperature change occurs to the greatest extent with_______________?
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A. Composite resin

B. Direct filling gold

C. Amalgam alloy

D. Unfilled resin
23. Property of the material, which describes the resistance to abrasion, is_________________?
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A. Modulus of elasticity

B. None of the above

C. Yield strength

D. Hardness
24. Etchant preferred in gel from than in liquid form________________?
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A. Helps in visualization while placement

B. Enhance and concentrate the action of acid

C. Better control over placement

D. None of the above

25. To cure a heat cure resin, a proper heating cycle is necessary_____________?
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A. To prevent volume expansion

B. To prevent warpage

C. To prevent the porosity

D. All of the above

26. The pattern for the metallic framework of a removable partial denture is fabricated from________________?
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A. Modelling wax

B. Inlay wax type-II

C. Boxing wax

D. Casting wax
27. The melting point of silver is_____________?
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A. 1123 Centrigrade

B. 1063 centigrade

C. 850 Centrigrade

D. 960 Centigrade
28. Insufficient closure of the flasks during packing of denture base resin can result in_____________?
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A. Poor colour stability

B. Decrease in vertical dimension

C. Increase in vertical dimension

D. Less polymerization shrinkage

29. Sublimation is the conversion of a___________________?
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A. Gas directly to liquid

B. Solid to liquid and then to gas

C. Gas to liquid and then to soild

D. Solid directly to gas
30. Inadequate pressure application during flasking_______________?
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A. Increases vertical dimension

B. Causes poor quality of colour

C. Causes fracture of denture

D. Causes teeth to be shrunken in investment

31. Polymerisation of heat-cured methyl methacrylate is initiated by______________?
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A. Hydroquinone

B. Methyl ether

C. Benzoyl peroxide free radical

D. Tertiary amine

32. Tempering of steel cause________________?
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A. Increases hardness

B. decreases its toughness

C. Increase ductility

D. Increases its toughness

33. When restoring a tooth with resin material, acid etching can do all of the following except______________?
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A. Condition the tooth surface for better wetting

B. Increase the surface area

C. Permit chemical bonding between resin and enamel

D. Create surface irregularities in enamel for better mechanical retention of resin

34. Bonding of composite resins to tooth structure is by________________?
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A. Ionic bond

B. Mechanical

C. Vanderval forces

D. Covalent bond

35. Subsurface porosity is due to_____________?
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A. Thermal changes

B. Packing past the dough stage

C. Thickness of the resin

D. Lack of temperature

36. Modulus of elasticity means_______________?
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A. Ductility of a material

B. Rigidity or stiffness of the material

C. Malleability of the metal

D. Ability to be stretched with permanent deformation

37. Dentin bonding agents usually contain_____________?
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A. Only Hydrophilic component

B. Hydrophobic and hydrophilic component

C. Lyophillic and lyophobic component

D. Only Hydrophobic component

38. Inorganic phase of the composites aid in_______________?
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A. Increasing the mechanical strength

B. All of the above

C. Reducing the polymerization shrinkage

D. Decreasing the coefficient of thermal expansion

39. All of the following statements about the differences between self-polymerizing acrylic resins and heat-cured resins are true EXCEPT______________?
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A. The former have a lower molecular weight

B. The former have higher residual monomer content

C. The former have greater transverse strength

D. The former are more porous

40. The point at which a stress of a material exhibits a specific limited deviation P is called_______________?
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A. Ultimate strength

B. Yield strength

C. Tensile strength

D. Proportional limit