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.Management Sciences
Category: Impression Materials
The ranking of tear strength from the lowest to highest of all impression materials generally is as follows_______________?
A. Hydrocolloids, silicones, polyether, polysulfide
B. Silicones, hydrocolloids, polyether, polysulfide
C. Polysulfide, hydrocolloids, silicones, polyether
D. Hydrocolloids, polyether, silicones, polysulfide
All of the following statements about an alginate impression are EXCEPT________________?
A. It should be rapidly displaced from the mouth
B. It may exhibit fluid exudates on the surface as a result of imbibition of water
C. It will take up water and expand if kept wet
D. It will shrink as a result of syneresis
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
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