dental materials MCQs – Page 5

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

dental materials Mcqs

81. Acrylic resins were first introduced as a denture base material in______________?
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A. 1937

B. 1925

C. 1956

D. 1951

82. When two metals are completely miscible in liquid state and they remain completely mixed on solidifiation, the alloy formed is called________________?
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A. Solid solution

B. Inter metallic compounds

C. Eutectic mixture

D. Peritectic mixture

83. Which of the following is present in the powder of the acrylic resin______________?
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A. D-methyl paratolouidine

B. Methyl methacrylate

C. Benzoyl peroxide

D. Hydroquinone

84. The polymerization of self-curing resin takes faster in______________?
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A. Cold water

B. Under pressure

C. In vaccum

D. Hot water

85. The type of spatula used to mix composite is________________?
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A. Plastic

B. Stainless steel

C. None of the above

D. Iron

86. What is the polymerization shrinkage if 3:1 powder: liquid ratio is used____________?
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A. 8%

B. 21%

C. 10%

D. 6%

87. The strain that occurs when a material is stressed to its proportional limit is______________?
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A. Resilience

B. Elastic limit

C. Maximum flexibility

D. Toughness

88. For photo-curing the composite resin the light source______________?
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A. Is fiber optic

B. Will cure composite upto a depth of 5 millimeter thickness

C. Need no protection while in use

D. Should be held at a millimeter distance from the restoration

89. A good adhesive should possess all of the following EXCEPT________________?
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A. High flow

B. High adherend wetting

C. Low contact angle

D. High contact angle

90. The stiffness of a dental gold alloy is determined by its________________?
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A. Flow

B. Proportional limit

C. Ultimate tensile strength

D. Modulus of elasticity

91. The main advantage of composites over unfilled direct filling resin is their_____________?
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A. Higher solubility in saliva

B. Lower modulus of elasticity

C. Lower thermal co-efficient of expansion

D. Esthetic excellence

92. The accepted polymer to monomer ratio for packing of polymethyl methacrylate resin is____________?
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A. 4:01

B. 3:1

C. 5:01

D. 10:01

93. Light cure system, side effect is____________?
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A. Cataract

B. Retinal damage

C. Conjunctivitis

D. Iritis

94. Sub surface porosity can be decreased by_______________?
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A. Increasing the melting temperature

B. Increasing the mould temperature

C. Decreasing the sprue length

D. Decreasing the sprue thickness

95. The proportional limit is defined as______________?
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A. The maximum stress in a structure

B. The maximum elongation under tension that can be measured before failure

C. The maximum stress that can be induced without permanent deformation

D. The minimum force required to cause a structure to break

96. Non metal which conducts elactricity______________?
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A. Acrylic

B. Porcelain

C. Graphite

D. Carbon

97. One of the claims for the superiority composite resin restoration over silicate cement restorations is that the resin restorations_____________?
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A. Have a higher coefficient of thermal expansion

B. Are practically insoluble in oral fluids

C. Adapt to the walls of the cavity better

D. Prevent galvanic action

98. Which of the following properties of dental materials is time dependent_______________?
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A. Resillience

B. Ultimate strength

C. Elastic limit

D. Creep

99. Angles between Adhesive and Adherent is Zero degree, it indicates_______________?
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A. Complete wetting of surfaces

B. Irregularities present between Adherent surfaces

C. Adherent and Adhesive molecules are tangent to each other

D. Rough surfaces between Adhesive & Adherent

100. Composite resins in comparison to acrylic have_______________?
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A. High abrasive resistance

B. High water absorption

C. High polymerization shrinkage

D. Low compressive strength

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