dental materials MCQs – Page 4

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

dental materials Mcqs

61. Which of the following is correct________________?
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A. Type I and Type II gold can be heat treated and annealed

B. Type I and IV gold can be heat treated and annealed

C. Type III and Type IV gold can be heat treated and annealed

D. All the type of gold can be heat treated and annealed

62. Macromolecules in Dental Resin is attached by______________?
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A. sonic bonds

B. Vander Walls Forces

C. Covalent bonds

D. Hydrogen Bonds

63. A fluid having constant viscosity that does not depend upon the strain rate is said to be_______________?
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A. Newtonian

B. Viscoelastic

C. Pseudoplastic

D. Plastic

64. Coefficienty of thermal expansion of tooth enamel is closest to_______________?
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A. Polycarboxylate

B. Slicate cement

C. GIC

D. Composite

65. Which zone is the hottest and efficient burning zone of the flame used for casting ?
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A. Reducing zone

B. Combustion zone

C. Oxidizing zone

D. None of the above

66. One bottle system of adhesive resins_____________?
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A. Contains only primer

B. 4th generation bonding agents

C. Separate etching step not required

D. Separate etching step is still required

67. If resin is packed in sandy stage what will be seen in the processed denture ?
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A. Inhomogeneous colour

B. Increased strength

C. Porosity

D. Distortion

68. The latest method of curing denture base resins______________?
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A. Lasers

B. Heat

C. Chemicals

D. Visible light

69. Which one of the following is most elastic ?
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A. Nickel-titanium

B. B titanium

C. Chrome-cobalt-nickel

D. a titanium

70. Investment material used for cobalt-chromium alloys is_____________?
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A. Gypsum bonded

B. Silica bonded

C. Phosphate bonded

D. None of the above

71. Localised shrinkage porosity is seen when there________________?
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A. No reservoir

B. Inadequate air discharge

C. Investment heated strongly

D. Thin sprue

72. The contraction of gold alloy on solidifying is approximately_____________?
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A. 0.40%

B. 1.4%

C. 3.40%

D. 2.40%

73. If resin is packed in sandy stage what will be seen in the processed denture ?
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A. Inhomogeneous colour

B. Distortion

C. Increased strength

D. Porosity

74. Hydroquinone is added to methyl methacrylate monomer_________________?
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A. All of the above

B. To prevent polymerization during storage

C. To initiate release of free radicalls

D. To enable polymerization reaction at room temperature

75. The ability of an alloy to withstand mechanical stresses without permanent deformation is reflected by its______________?
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A. Elastic limit / Elastic strain

B. Hardness

C. Fatigue resistance

D. Resilience

76. For esthetic areas where high luster is required the restoration used usually______________?
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A. Microfilled resin composites

B. Glass ionomer restoratives

C. Hybrid resin composites

D. Macrofilled resin composites

77. Cleaning of base metal alloy is done by______________?
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A. Cold H2SO4

B. Sand blasting with aluminium oxide

C. Warm HCI

D. Cold HF

78. The imperfection seen on the lingual flange of a lower denture caused by rapid heating during a curing cycle is called_____________?
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A. Micro porosity

B. Localised Shrinkage porosity

C. Gas inclusion porosity

D. Surface porosity

79. In heat cure denture base acrylic resins the monomer is___________?
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A. Methyl ethyl methacrylate

B. Polymethylmethacrylate

C. Methacrylate

D. Ethylmethacrylate

80. Austenite is an alloy of iron of and carbon with the iron in______________?
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A. Gamma form

B. Beta form

C. Alpha form

D. None of the above

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