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.Management Sciences
Category: Dental Materials
Impurities in casting is removed by________________?
A. Annealing
B. Degassing
C. Pickling
D. Conditioning
Which of the following is most important in strength ZOE_____________?
A. Liquid powder ratio
B. Temperature of mixing stab
C. Speed of mixing
D. Addition of few drops of water
Suck back porosity is due to_________________?
A. Attached impurities on undersurface of casting
B. Hot spot
C. No rapid cooling
D. Inadequate melting temperature
Bonding of composite resins to tooth structure is by________________?
A. Covalent bond
B. Ionic bond
C. Mechanical
D. Vanderval forces
Ag-Cu eutectic alloy has a characteristic Property of that fusion temp of_____________?
A. The resultant alloy is greater
B. The resultant alloy is lesser
C. The resultant alloy varies according to the content of Ag of Cu
D. None of the above
All of the following statements about the differences between self-polymerizing acrylic resins and heat-cured resins are true EXCEPT______________?
A. The former have a lower molecular weight
B. The former have higher residual monomer content
C. The former are more porous
D. The former have greater transverse strength
Which of the following absorbs maximum amount of water ?
A. Microfilled resin
B. Macrofilled resin
C. Hybrid
D. Light cure activated
When restoring a tooth with resin material, acid etching can do all of the following except______________?
A. Increase the surface area
B. Permit chemical bonding between resin and enamel
C. Create surface irregularities in enamel for better mechanical retention of resin
D. Condition the tooth surface for better wetting
The best pickling solution for gypsum bonded investment is_______________?
A. Hydrochloric acid
B. Nitric acid
C. Sulphuric acid
D. Phosphoric acid
Quartz is added to gypsum bonded investment to______________?
A. Increase the strength
B. Counter balance contraction of gypsum during heating
C. aid in hygroscopic expansion
D. Increase the shelf life of investment
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