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.
81. The most important disadvantage of acrylic denture base is_______________?
C. Tooth breakage
D. Water absorption
82. Radio opacity to composite resins is rendered by_______________?
A. Silica glass
B. Organic matrix
C. Barium glass and strontium glasses
D. Fluoride particles
83. Acrylic (cold cure)______________?
A. Melts at 100°C
B. Softens at 100°C
C. Still requires heat for polymerization
D. Produces heat during polymerization
84. Use of dimethyl-P-toluidine is indicated for_______________?
A. Thermal polymerization of acrylic
B. Chemical polymerization
C. Retarding the polymerization reaction
D. To inhibit the action of benzoyl peroxide
85. If curing occurs at temperature more than 100°C porosity results in which area of denture______________?
A. Hard thick central area
2. Thin Palatal area
3. Thin area of flanges
4. Porosity is uniformly distributed
86. All of the following statements about the differences between self-polymerizing acrylic resins and heat-cured resins are true EXCEPT______________?
A. The former have a lower molecular weight
B. The former have higher residual monomer content
C. The former are more porous
D. The former have greater transverse strength
87. Deformation that is recovered upon removal of an externally applied force or pressure is known as_____________?
A. Young’s modulus
B. Plastic strain
C. Elastic strain
D. Flexural strain
88. Coefficienty of thermal expansion of tooth enamel is closest to_______________?
A. Slicate cement
89. The forces that hold atoms together are called_____________?
A. Primary forces
B. Secondary forces
C. Cohesive forces
D. Ionic forces
90. A material which partially transmits light & partially scatters it________________?