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.Management Sciences
Category: Dental Materials
Light cure system, side effect is____________?
A. Iritis
B. Cataract
C. Conjunctivitis
D. Retinal damage
The product, which is obtained by calcining gypsum under steam pressure at 120-130°C or by dehydrating gypsum in the presence of sodium succinate is_______________?
A. Alpha – hemihydrates
B. Beta – hemihydrates
C. Calcium sulphate dihydrate
D. Orthorhombic anhydrate
Minimum thickness for type I zinc phosphate cement should be_______________?
A. 15 microns
B. 25 microns
C. 50 microns
D. 100 microns
Which material undergoes hysteresis ?
A. Irreversible hydrocolloid
B. Reversible hydrocolloid
C. Impression plaster
D. Metallic oxide paste
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
The component in very minor quantity in stainless steel that changes the properties to a maximum level is____________?
A. Carbon
B. Molybdenum
C. Chromium
D. Nickel
Glass ionomer cements are composed of______________?
A. Alumino silicate powder and phosphoric acid
B. Aluminosillicate powder and polyacrylate
C. Zinc oxide powder and phosphoric acid
D. Zinc oxide powder and polyacrylate liquid
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
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