dental materials MCQs – Page 7

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

dental materials Mcqs
121. What is the disadvantage of using composites as restorative material ?
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A. Decreased wear resistance

B. None of the above

C. Increased thermal conductivity

D. Decreased thermal conductivity

122. Which of the following absorbs maximum amount of water ?
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A. Macrofilled resin

B. Microfilled resin

C. Hybrid

D. Light cure activated

123. The inlay wax most commonly used for direct technique_____________________?
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A. Type 1

B. Type 3

C. Type 4

D. Type 2

124. No trail closure is necessary with which one of the technique during denture fabrication_____________?
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A. Compression moulding technique

B. Fluid resin technique

C. Light cured technique

D. Injection moulding technique
125. Acrylic (cold cure)______________?
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A. Softens at 100C

B. Melts at 100C

C. Produces heat during polymerization

D. Still requires heat for polymerization

126. KHN of enamel is close to______________?
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A. Pure gold

B. Amalgam

C. Composite

D. Prcelain
127. Brinnel hardness number of a dental gold alloy is directly proportional to its______________?
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A. Tensile strength

B. Modulus of resilience

C. Elongation

D. Modulus of elasticity

128. Use of dimethyl-P-toluidine is indicated for_______________?
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A. Chemical polymerization

B. To inhibit the action of benzoyl peroxide

C. Thermal polymerization of acrylic

D. Retarding the polymerization reaction

129. The forces that hold atoms together are called_____________?
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A. Secondary forces

B. Ionic forces

C. Cohesive forces

D. Primary forces

130. Stress in defined as_______________?
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A. A deformation resulting from an applied load

B. An external force opposing an applied load

C. An applied load or force

D. An internal force opposing an applied load
131. To prevent porosity in self-cure acrylic resin, curing should be carried in______________?
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A. Under vacuum pressure

B. Under tap water

C. Hot water

D. Cold water

132. Flow of a material refers to_______________?
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A. Dimensional change of the material during settings

B. The homogencity of gypsum products

C. Continued change of the material under a given load

D. The consistency of material when mixing

133. The main form of iron carbide found in 18-8 steel________________?
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A. Ferrite

B. Martensite

C. Austenite

D. Pearlite

134. The purity of gold is expressed in________________?
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A. Gram

B. Fineness

C. Carats

D. Percentage

135. Along with polymerisation shrinkage, one of the major disadvantages of polymethyl methacrylate as denture base resin are its poor_____________?
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A. Thermal properties

B. Esthetic properties

C. Biological properties

D. Mechanical properties

136. The commonly used laser for curing composite resin is______________?
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A. Nd:YAG

B. CO2

C. ER:YAG

D. Argon
137. Residual monomer content of chemically activated resins is______________?
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A. 0.2% to 0.5%

B. 0.3% to 0.5%

C. 2% to 5%

D. 2% to 5%
138. Silica sol__________________?
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A. Acts as a retarder in the silica bonded investments

B. Increase the strength and the setting expansion of the phosphate-bonded investment

C. Acts as a refractory in the Silica bonded investments

D. Is applied to the walls of the investment to produce hygroscopic expansion

139. Which of the following inhibitor accelerator system uses light activation composite ?
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A. Diketone-amine

B. Peroxide-amine

C. Organic acid-metal oxide

D. Organic acid-peroxide

140. The most important disadvantage of acrylic denture base is_______________?
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A. Tooth breakage

B. Water absorption

C. Shrinkage

D. porosity