Dental impression materials, also known as dental materials, initially exist in a liquid or semi-solid state upon mixing and placement in the mouth. Over a few minutes, these materials undergo a setting process, transforming into an elastic solid. During this time, they capture an accurate imprint of an individual’s dentition and the surrounding structures within the oral cavity. GuruMCQs.com provides all updated Dental Materials MCQs. MCQs of dental materials content are updated regularly, with the addition of new topics, more questions, and useful links. Repeated dental materials MCQs consist of impression materials like Amalgams, Dental Cements, Direct Filling Gold, Gypsum Products MCQs, Impression Materials, Metallurgy, Physical Properties, Dental Ceramics & Miscellaneous, Restorative Resins – and much more. These multiple-choice questions (MCQs) in dental materials serve as valuable resources for various purposes such as interview preparation, entrance exams, competitive assessments, and certifications for individuals at all levels of experience, including experienced professionals, newcomers, and students. Additionally, you can find MCQs on oral histology for further exploration.
21. The solvent flux used for base metal soldering is_______________?
A. Boric acid
A. Borax
B. Fluoride
C. Rouge
22. During soldering, the solidus temperature of the filler material should be_____________?
A. Greater than the substrate material
B. Lesser than the substrate material
C. Equal to the substrate material
D. Temperature not relevant
23. Which of the following increases castability of base metal alloys________________?
A. Tin
B. Beryllium
C. Molybdenum
D. Carbon
24. Which of the following fuel gases used for soldering, has the highest heat content______________?
A. Hydrogen
B. Natural gas
C. Acetylene
D. Propane
25. Binder in phosphate bonded investment is______________?
A. Magnesium oxide & Phosphate
B. Magnesium oxide & Phosphoric acid
C. Magnesium oxide & Monoammonium phosphate
D. Magnesium oxide & Ortho Phosphoric acid
26. Which one of the following elements is NOT added is small amount to be used as grain refiners ?
A. Iridium
B. Ruthinium
C. Indium
D. Platinum
27. Within an hour after cementation of cast gold onlay patient complains of shooting pain every time the teeth comes together Most probable explanation is ______________?
A. Supracocclusion of restoration
B. Retained cement in gingival sulcus
C. Excess acid in mix
D. Galvanic current caused by gold onlay occluding with a large restoration
28. The rate of tarnish and corrosion of class II cast material having VHN 200 is_______________?
A. 0%
B. 2 to 3%
C. 5 to 10%
D. <1%
29. Function of wetting agents used in casting procedure is_________________?
A. To felicitate wetting of ring liner
B. To felicitate mixing investment
C. To reduce contact angle of liquid with max surface
D. For better wax elimination
30. The deoxidizing agent added to dental alloys is______________?
A. Palladium
B. Silver
C. Copper
D. Zinc