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.Management Sciences
Category: Impression Materials
In reversible hydrocolloid the property by which the transformation from sol to gel and gel to sol is a function of the_____________?
A. Concentration of filler and plasticizer
B. Percentage composition by weight of water
C. Concentration of potassium sulphate
D. Temperature
Sol – gel transformation is seen in________________?
A. Impression plaster
B. Hydrocolloids
C. Elastomer
D. Impression compound
Which is best material for RPD impression_______________?
A. Impression plaster
B. Irreversible hydrocolloid
C. Reversible hydroollioid
D. None of the above
The process of changing the rubber base product or liquid polymer, to a rubber like material is generally known as_____________?
A. Boiling
B. Condensation
C. Vulconization
D. Chain lengthening
Vulcanization refers to the setting of__________________?
A. Reversible hydrocolloid
B. Mercaptan impression material
C. Zinc Phosphate cement
D. Zinc oxide-eugenol
Hypersensitivity reactions like contact dermatitis can be caused by______________?
A. polysulfides
B. Condensation silicones
C. addition silicones
D. Polyether
Inelastic impression material is_____________?
A. Impression compound
B. Alginate
C. Agar-agar
D. Polyether
The setting time of irreversible hydrocolloids can be decreased by_____________?
A. Raising the temperature of water used for maxing
B. Using excess water for maxing
C. Lowering the temperature of water used for mixing
D. None of the above
Agar is prepared from_______________________?
A. Bullock heart
B. Chemicals
C. Sea weed
D. Chick cells
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