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.
161. Sub surface porosity can be decreased by_______________?
A. Decreasing the sprue length
B. Decreasing the sprue thickness
C. Increasing the melting temperature
D. Increasing the mould temperature
162. The inlay wax most commonly used for direct technique_____________________?
A. Type 1
B. Type 2
C. Type 3
D. Type 4
163. The purity of gold is expressed in________________?
164. In a metal ceramic crown for a FPD the function of tin, indium which are readily oxidized minor constituents is to________________?
A. Improve bonding
B. Decrease porosity
C. They react with the porcelain opaque layer, which masks the metal
D. Improves the thermal expansion between the metal and porcelain
165. Investment material used for cobalt-chromium alloys is_____________?
A. Gypsum bonded
B. Phosphate bonded
C. Silica bonded
D. None of the above
166. Silica sol__________________?
A. Is applied to the walls of the investment to produce hygroscopic expansion
B. Increase the strength and the setting expansion of the phosphate-bonded investment
C. Acts as a retarder in the silica bonded investments
D. Acts as a refractory in the Silica bonded investments
167. Boxing wax is also called as________________?
A. Carding wax
B. Inlay wax
C. Utility wax
D. Sticky wax
168. Shape memory in NiTi is because of stress induced form__________________?
A. Austenite to martensite
B. Martensite to austenite
C. Ferrite to austenite
D. Austenite to ferrite
169. Casting shrinkage is compensated by_______________?
A. Thermal expansion
B. Hygroscopic expansion
C. Wax expansion
D. All of the above
170. The gold alloys used for casting contain at least…. percent of precious metal according to ADA specification number 5________________?