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.Management Sciences
Category: Impression Materials
Hydrocolloid material, show all except______________?
A. Hysterisis
B. Imbibition
C. Recrytallisation
D. Syneresis
Linear contraction of elostomeric impression with passage of time is highest in______________?
A. Addition silicone
B. Polysulphide
C. Polyetner
D. Condensation silicone
Impression compound has which of the following characteristic property ?
A. Low thermal conductivity
B. High flow property
C. Degradation is presence of moisture
D. Remain distortion free up to 72 hrs. pouring can be safely delayed
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 is not affected by saliva ?
A. Impression plaster
B. Impression paste
C. Silicon impression material
D. None of the above
The basic constituent of reversible hydrocolloid impression material is________________?
A. Agar
B. Alginic acid
C. Gelatin
D. alginate
Hardening solutions are used with impression made of________________?
A. Hydrocolloid
B. Impression compound
C. Elastomer
D. Zinc oxide eugenol
Brush heap structure is found in______________?
A. Zinc oxide impression material
B. Agar
C. Condensation silicone
D. Polyether
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
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