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.Management Sciences
Category: Dental Materials
The cavity varnish applied reduces post operative sensitivity in amalgam restoration by____________?
A. Decreasing conduction of heat to pulp
B. Minimize marginal leakage around restoration
C. By altering the chemical composition of restoration materials
D. By preventing penetration of corrosion products into the dentinal tubules
A thinner mix of a gypsum bonded investment will_______________?
A. Produce a smoother casting
B. Decrease setting expansion
C. Increase setting expansion
D. Increase thermal expansion
Hardness number which does not depend on the ductility of metal_____________?
A. KNH
B. VHN
C. RHN
D. BHN
Co-efficient of thermal expansion is highest for_____________?
A. Amalgam
B. Silicate cement
C. Gold alloy
D. Acrylic resin
If curing occurs at temperature more than 100°C porosity results in which area of denture______________?
1. Hard thick central area
2. Thin Palatal area
3. Thin area of flanges
4. Porosity is uniformly distributed
In heat cure denture base acrylic resins the monomer is___________?
1. Methacrylate
2. Ethylmethacrylate
3. Methyl ethyl methacrylate
4. Polymethylmethacrylate
Sublimation is the conversion of a___________________?
A. Solid directly to gas
B. Gas to liquid and then to soild
C. Gas directly to liquid
D. Solid to liquid and then to gas
The cross linking agent of polysulphide rubber base impression material is______________?
A. Aromatic sulfonate esters
B. Stannous octate
C. Platinum salt catalyst
D. Lead dioxide
Which of the following cast gold alloys is used for fabricating partial denture frameworks______________?
A. Type I – Soft
B. Type II – Hard
C. Type III – Hard
D. Type IV – Extra Hard
Which one of the following categories of dental materials has the highest thermal conductivity_________________?
A. Unfilled acrylic plastics
B. Gold alloys
C. Porcelains
D. Zinc phosphate cements
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