dental materials MCQs – Page 6

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

dental materials Mcqs
101. Benzoin methyl ether in a polymer indicates that they may be cured in the presence of________________?
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A. Diketone

B. Visible light

C. UV light

D. Infrared light

102. The advantage of unfilled methyl methacrylate is that______________?
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A. It has a low degree of flow

B. It can be finished smoothly

C. Its non-irritation to pulp

D. Its wear resistant is high

103. Which one of the following is the result of applying a load to a wire below its modulus of elasticity on a load deflection diagram ?
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A. Fracture of the wire

B. Spring back

C. Increase in stiffness

D. permanent deformation

104. A material which is a mixture of two different materials and its properties are_____________?
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A. Composite

B. Combined

C. Complex material

D. Compound

105. Which of the following zones is used for melting alloy during casting______________?
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A. Green flame

B. Reducing flame

C. All of the above

D. Oxidizing flame

106. Pickling________________?
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A. Removes surface oxides from gold castings

B. Is accomplished by soaking the casting in baking soda

C. Remove investment from gold casting

D. Causes porosity in gold

107. Which of the following constituents is common in occlusal sealants, bonding agents, composite resins ?
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A. BIS GMA

B. Polymethyl methacrylate

C. Benzoin methyl ether

D. Silica filter

108. Maxwell Voigt Model is to determine________________?
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A. Plastic Behaviour

B. Viscoelastic Behaviour

C. All of the above

D. Elastic Behaviour

109. Liquids which become more rigid as the rate of deformation increases is termed as_____________?
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A. Pseudoplastic

B. Thixotropic

C. Newton

D. Dilatant
110. Composite has_______________?
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A. None

B. Resin

C. Filler

D. Resin & Filler
111. Etching depth after 30 sec for orthodontic bracket with orthophosphoric acid is_________________?
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A. 50 um 110 um

B. 10 um 20 um

C. 3 um 9 um

D. 200 um 250 um

112. The greatest stress which may be produced in a material such that stress is directly proportional to the strain is know as_____________?
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A. The yield strength

B. The proportional limit

C. The elastic limit

D. Modulus of elasticity

113. Ideal requirement of metal ceramic casting____________?
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A. Matching of coefficients of thermal expansion of ceramics and alloy

B. All of the above

C. Bonding between ceramic and alloy

D. Low fusing ceramic and high fusing alloys

114. The function of the coupling agent in a restorative resin is to allow______________?
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A. Bonding between filler crystals

B. Adhesion of resin particles

C. Bonding between tooth and resin

D. Bonding between filler and resin

115. Which of the following provide opacity to composite ?
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A. None of the above

B. TEGDMA

C. BIS-GMA

D. Ti02
116. The simplest alloy is a_______________?
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A. Ternary alloy

B. Solid solution

C. Peritectic allowy

D. Eutectic alloy

117. The particle size in microfilled composites is_____________?
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A. 0.01 to 0.1 microns

B. 0.05 to 0.04mm

C. 0.3 to 0.4mm

D. 0.5 to 1.0 microns

118. Porosity of denture base is due to_______________?
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A. Inadequate pressure

B. Curing at 160F for 9 hrs

C. All of the above

D. Packing at dough stage

119. Which of the following hardness test is a micro hardness test ?
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A. Rockwell

B. Knoop

C. Shore-A

D. Brinnel

120. Dentin conditioner has the following function______________?
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A. Removes smear layer

B. Forms a thin resin layer over exposed collagen fibrils

C. Helps in bonding with composite

D. Increases surface energy of dentin