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.
31. Which of the following is function of fluoride flux in soldering process ?
A. It prevents the formation of copper oxide
B. It prevents the formation of chromium oxide or dissolves chromic oxide layer
C. It prevents the flow of material in undesirable area
D. Increase the strength of solder
32. Percentage of gold in high noble alloy is______________?
A. N 25%
B. 25%
C. >40%
D. 0%
33. Gases dissolved in molten metals are liberated when cooled giving rise to________________?
A. Suckback porosity
B. Gas inclusion porosity
C. Localized shrinkage porosity
D. Microporosity
34. Casting flux is used to_______________?
A. Prevent the oxidation of the metal during melting
B. increase the melting point of the flux
C. Flaring the point of the sprue attachment
D. None of the above
35. The main ingredient of inlay wax is__________________?
A. Candellila wax
B. Paraffin wax
C. Carnauba wax
D. Gum dammar
36. Who was the first person to introduce cast inlay restoration into dentistry ?
A. William H Taggart
B. Buonocore
C. G.V. Black
D. Bowen
37. Disadvantage of having a short sprue is________________?
A. Rapid solidification of metal
B. No place for reservoirs
C. Incomplete evacuation of gases
D. Difficulty in removing casting from investment
38. 18-B Stainless steel orthodontic wire has_______________?
A. 18% Nickel 8% Chrominum
B. 18% Chromium 8% Nickel
C. 18% Chromium 8% Cobalt
D. 18% Carbon 8% Iron
39. Inlay wax is used to_______________?
A. Temporarily cement inlays:
B. Make inlay wax patterns
C. Invest inlay patterns
D. Box models
40. Quartz in investment material is added for_______________?
A. Strength
B. Expansion components for casting shrinkage
C. Decrease strength
D. Contraction