Impression materials( Dental materials ) is of liquid or semi-solid nature when first mixed and placed in the mouth. It then sets to become an elastic solid (usually takes a few minutes depending upon the material), leaving an imprint of a person’s dentition and surrounding structures of the oral cavity. Academictask provides 2000+ basic and advanced level of dental materials MCQs with answers. In this section, we focus on all areas of MCQs on dental materials subject and cover all important topics of impression material like Amalgams, Dental Cements, Direct Filling Gold, Gypsum Products Mcqs, Impression Materials, Metallurgy, Physical Properties, Dental Ceramics & Miscellaneous, Restorative Resins – and much more. All these topics are chosen from trusted and best reference books on dental and impression materials. These dental materials MCQs are also helpful for the preparation of interviews, entrance examinations, other competitive examinations, and certifications for all Experienced, Freshers and Students. Also, check MCQs on Pathology here.
61. Which one of the following is used as filler in composite resins ?
C. Zinc particles
62. The chemical used to etch enamel is_______________?
A. Zinc oxide
B. Methyl methacrylate
C. Phosphoric acid
63. Which of the following procedure is indicated to produce cross-linking in the polymerization of linear chains of acrylic_______________?
A. Addition of grain refining agents
B. Addition of difunctional monomers
C. Increasing the amount of heat required for linear polymerization
D. Incorporation of terminating agents
64. For photo-curing the composite resin the light source______________?
A. Should be held at a millimeter distance from the restoration
B. Need no protection while in use
C. Will cure composite upto a depth of 5 millimeter thickness
D. Is fiber optic
65. In self-cure acrylic resin, activator is_____________?
B. Quaternary ammonium compound
C. Benzoyl peroxide
D. Tertiary amine
66. Marginal leakage related to temperature change occurs to the greatest extent with_______________?
A. Amalgam alloy
B. Unfilled resin
C. Composite resin
D. Direct filling gold
67. Acrylic resins were first introduced as a denture base material in______________?
68. What is the disadvantage of using composites as restorative material ?
A. Increased thermal conductivity
B. Decreased wear resistance
C. Decreased thermal conductivity
D. None of the above
69. The % of free monomer in a heat – cured acrylic resin is_______________?
A. 3% to 5%
B. 8% to 10%
C. 0.2% to 0.5%
D. 0.6% to 0.8%
70. Inadequate pressure application during flasking_______________?
A. Increases vertical dimension
B. Causes teeth to be shrunken in investment
C. Causes poor quality of colour
D. Causes fracture of denture