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.
41. The sprue in wax pattern should be placed________________?
A. At right angle
B. At 45°C angle
C. At obtuse angle
D. It depend upon type of wax pattern
42. Gold content of an 18 carat alloy is______________?
A. 25%
B. 50%
C. 75%
D. 100%
43. Titanium casting is done_____________?
A. Under vacuum in argon atmosphere
B. Under air pressure in nitrogen atmosphere
C. In specially fabricated aluminium vanadium
D. Using CAD-CAM technique
44. Heat hardening is the process done at_______________?
A. Heating 750°C and slowly cooling to zero degree
B. Heating quickly upto 450°C followed by sudden quenching
C. Heating upto 250°C for 15 to 30 min
D. Heating at 750°C and then quenching to room temperature
45. Crucible indicated for casting base metal alloys is______________?
A. Carbon crucible
B. Clay crucible
C. Quartz crucible
D. High melting plastic crucible
46. Which of the following refractory is used to counteract most of the expansion________________?
A. Quartz
B. Cristobalite
C. Tridymite
D. Corundum
47. Passivating alloys are_______________?
A. Cr, Al, Ti
B. Cr, Mo, Ti
C. Cr, Gold, Ti
D. Cr, Fe, Ti
48. Waxes are used for_______________?
A. Primary impression
B. Corrective impressions
C. Impression of single tooth
D. None of the above
49. A common electrolyte used for plating copper indirect dies is_______________?
A. Copper cynide
B. Ionic copper
C. Acidic copper sulfate
D. Silver cyanide
50. Stainless steel is used mostly in dentistry_________________?
A. To strength amalgam
B. In orthodontic wires
C. To construct clasps for partial dentures
D. To replace internal gold restorations