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.
71. The maximum carbon content of steel used in dentistry is__________________?
A. 19%
B. 2%
C. 1.7%
D. 4%
72. Flux is used during casting to________________?
A. Remove the oxides formed on the gold alloy
B. Lower the melting point
C. Replace casting wax
D. Speed the burnout process
73. Resistance to corrosion in a cobalt-chrome casting is due to presence of_______________?
A. High quality iron
B. Chrome
C. Cobalt
D. Nickel
74. Which is the use of boxing an impression______________?
A. Ease of construction of denture
B. Preserving the sulci
C. Ease of pouring an impression
D. All of the above
75. Gap between true end of casting ring and wax pattern should be______________?
A. ¼ inch
B. ½ inch
C. 3/8 inch
D. one inch
76. Addition of large amounts of platinum to a casting gold alloy will________________?
A. Decrease its strength and ability to be hardened
B. Decrease its tarnish resistance
C. Increase its fusion temperature
D. Redden the alloy
77. All of the following statements about cast cobalt alloy are true EXCEPT_____________?
A. They have a modulus of elasticity twice that of gold alloys
B. They are more rigid than gold alloys
C. They have higher ductility than gold alloys
D. They have a lower proportional limit than gold alloys
78. 4th state of matter is______________?
A. Solid
B. Liquid
C. Gas
D. Colloid
79. All of the following statements about an alginate impression are EXCEPT________________?
A. It should be rapidly displaced from the mouth
B. It may exhibit fluid exudates on the surface as a result of imbibition of water
C. It will take up water and expand if kept wet
D. It will shrink as a result of syneresis
80. Type I and Type II zinc oxide impression paste differ with respect to_______________?
A. Their use
B. Their hardness after setting
C. Water content
D. Eugenol content