Impression Materials Mcqs
Q.1: The Zinc oxide-eugenol impression pastes harden by________________?C
A. Chemical reaction
B. Cold
C. Heat
D. Pressure
Q.2: All of the following statements about Type II silicon impression material are true EXCEPT_______________?i
A. They evolve hydrogen when cast if they are not fully cured:
B. They exhibit a very low setting shrinkage)
C. They have a lower tear resistance than polysulphide rubbers;
D. They set by condensation polymerisation'
Q.3: All of the following can be used to slow down the setting of Zinc oxide eugenol impression paste EXCEPT_________________?y
A. Adding a small amount of glycerine"
B. Adding a small amount of water
C. Altering the amounts of the two pastes used+
D. Cooling mixing slab
Q.4: Hysteresis in a hydrocolloid gel is______________?2
A. Moisture absorption
B. Temperature lag between gelation and liquefaction temperature=
C. Phenomenon of conversion of gel into sol(
D. All of the above
Q.5: The base paste of the condensation poly sillicone has a low molecular weight dimethyl siloxane with a terminal-group_______________?
A. Marcaptan group
B. Hydroxyl group
C. Silane group
D. Virryl group
Q.6: Best material for duplicating cast is_______________?5
A. Agar-agar
B. Alginate
C. Zinc oxide eugenol
D. Plaster of paris
Q.7: Syneresis seen in hydrocolloid gel is______________?4
A. Seen as water loss
B. Water absorption
C. Shrinkage
D. Gelation
Q.8: Impression techniques are used for recording________________?=
A. Oral mucosal tissues
B. Dental hard tissues
C. Oral mucosal tissues and dental hard tissues,
D. None of the above
Q.9: Vulcanization refers to the setting of__________________?9
A. Reversible hydrocolloid
B. Mercaptan impression material
C. Zinc Phosphate cement
D. Zinc oxide-eugenol
Q.10: Impression plaster is_____________?#
A. Less compressive than alginate
B. More compressive than alginate
C. As compressive as alginate
D. More compressive than hydrocolloids#

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