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.
191. Dendrites in cst alloys form by mechanism of_________________?
A. Constitutional superconductivity
B. Constitutional supercooling
C. Constitutional supergriting
D. Constitutional supergraining
192. Compared with noble metals, base metals show_______________?
A. Increased hardness
B. Increased ductility
C. Better biocompatibility
D. Increased density
193. Mechanical properties of Cp Titanium are similar to alloys_____________?
A. Type III and Type IV gold
B. Type V and type VI gold
C. Type VII and type VIII gold
D. None of the above
194. The effects associated with cold working can be eliminated by a heat treatment called______________?
A. Age hardening heat treatment
B. Annealing heat treatment
C. Homogenization heat treatment
D. Solution heat treatment
195. With indirect spruing. Which one of the following porosities can be minimised_______________?
A. Back pressure porosity
B. Localized shrinkage porosity
C. Pin hole porosity
D. Micro porosity
196. The linear solidification shrinkage of Type IV Ni-Cr based alloys is_______________?
197. Which of the following cast gold alloys is used for fabricating partial denture frameworks______________?
A. Type I – Soft
B. Type II – Hard
C. Type III – Hard
D. Type IV – Extra Hard
198. Modern dental noble metal casting alloys generally have equiaxed fine grain structures because of the incorporation of small amounts of______________?
199. Nickel is added to wrought gold alloys as______________?
C. Whitens the alloy
200. Stages of annealing in order_________________?
A. Recovery recrystallization grain growth
B. Recrystallization recovery, grain growth
C. Grain Growth Recrystallization recovery
D. Melting point, grain growth, Recrystallization