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.Management Sciences
Category: Dental Materials
During polymerisation of acrylic resin, above what temperature benzoyl peroxide form freeradicals_______________?
A. 25°C
B. 37°C
C. 50°C
D. 60°C
Linear contraction of elostomeric impression with passage of time is highest in______________?
A. Addition silicone
B. Polysulphide
C. Polyetner
D. Condensation silicone
Apart from composites and ceramics, another material that could be copy milled easily and inexpensively is_________________?
A. Molybdenum
B. Germanium
C. Titanium
D. Chromium
The solvent flux used for base metal soldering is_______________?
A. Boric acid
A. Borax
B. Fluoride
C. Rouge
Which one of the following dental cements does not contain water as part of the composition of the liquid component ?
A. Zinc Phosphate cement
B. Zinc oxide equgenol cement
C. Zinc silicophosphate cement
D. Zinc polycarboxylate cement
Condensation shrinkage of porcelain during firing depends on__________________?
A. Rate of arriving at firing temperature
B. Uniformity of particle size
C. Shape and size of particle
D. Type of investment used
Which of the following is NOT true of polymethyl methacrylate ?
A. Knoop hardness number 18 to 20
B. Tensile strength of 60 MPa
C. Density of 1.13 g/cm3
D. Modulus of elasticity of 3.4 GPa
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
Impression plaster containing potato starch is called______________?
A. Plaster of paris
B. Soluble plaster
C. Anti – expansion solution
D. Die stones
Beta hemihydrate particles absorb______________?
A. More water
B. Less water
C. no water
D. None of the above
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