Medical MCQs

5099 MCQs  (Page 77 of 510)

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
Which is best material for RPD impression_______________?
A. Impression plaster
B. Irreversible hydrocolloid
C. Reversible hydroollioid
D. None of the above
Rinsing of the impression is important to________________?
A. Remove excess impression material
B. Remove saliva
C. Hydrate the impression
D. Accelerate the setting
The advantage of ZOE impression paste_______________?
A. Has dimensional stability
B. Does not adhere to tissues
C. Is easy manipulation
D. Does not require special trays
Syneresis is associated with______________?
A. Hydrocolloids
B. Elastomers
C. Zinc oxide eugenol
D. Plaster of paris
Alginates are_____________?
A. Sol
B. Gel
C. Hydrocolloid
D. Colloid
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
The plasticizers used in polyether impression material is_______________?
A. Polyether polymer
B. Colloidal silica
C. Glycol ether
D. Di-vinyl poly (dimethyl siloxane)