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.
171. Impurities in casting is removed by________________?
A. Annealing
B. Degassing
C. Pickling
D. Conditioning
172. Shape memory is seen in________________?
A. Stainless steel wire
B. NITTINOL wire
C. TMA wire
D. Aluminium
173. The best pickling solution for gypsum bonded investment is_______________?
A. Hydrochloric acid
B. Nitric acid
C. Sulphuric acid
D. Phosphoric acid
174. Corrosion of stainless steel is due to formulation of_________________?
A. Chromium carbide
B. Carbon carbide
C. Iron carbide
D. Nickel carbide
175. The rapid decrease in tensile strength and increase in ductility of a wrought metal is seen in which stage of annealing ?
A. Recovery stage
B. Recrystallisation stage
C. Grain growth stage
D. All of the above
176. Which one of the following categories of dental materials has the highest thermal conductivity_________________?
A. Unfilled acrylic plastics
B. Gold alloys
C. Porcelains
D. Zinc phosphate cements
177. Most biocompatible material in oral cavity is_______________?
A. Platinium
B. Palladium
C. Titanium
D. Gold
178. Which of the waxes are derived from the lignite_________________?
A. Paraffin wax
B. Inlay wax
C. Microcrystalline wax
D. Montan wax
179. Silver plated dyes use an electrolytic bath of_______________?
A. Silver fluorides
B. Silver cyanide
C. Silver bromide
D. Silver iodide
180. Suck back porosity is due to_________________?
A. Attached impurities on undersurface of casting
B. Hot spot
C. No rapid cooling
D. Inadequate melting temperature