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.Management Sciences
Category: Impression Materials
The water powder ratio of alginate is______________?
A. 100 ml of water to 60 gms of powder
B. 40 ml of water to 40 gms of powder
C. 40 ml of water to 15 gms of powder
D. 15 ml of water to 40 gms of powder
Which of the following impression material is elastic________________?
A. Impression compound
B. Zinc Oxide eugenol (ZOE) paste
C. Wax
D. Polyvinyl siloxane
When making a polysulphide impression for a caste crown, custom trays are usually preferred over stock trays for all of the following reasons except_______________?
A. Custom trays facilitate uniform contraction of impression material
B. Custom trays require less impression material
C. Stock trays may be short in the flange area
D. Impressions made n the custom trays are easier to remove from the mouth
The relative hardness of elastomere is determined using________________?
A. Rockwell tester
B. Barcol indenter
C. Knoop pyramid
D. Shore durometer
Gelation temparature of agar is between________________?
A. 20°C to 25°C
B. 27°C to 33°C
C. 37°C to 50°C
D. 55°C to 60°C
A laminate impression technique utilizes_______________?
A. Syringe agar and chilled tray alginate
B. Syringe agar and tray agar
C. Syringe agar and impression compound
D. Chilled alginate and impression compound
Rinsing of the impression is important to________________?
A. Remove excess impression material
B. Remove saliva
C. Hydrate the impression
D. Accelerate the setting
Alginate impression material is similar to Agar-agar impression material in the following respect________________?
A. Gelation increase in both on increase in temperature
B. Mixing time is increased to reduce the setting time
C. Deformation during removal of impression occurs due to distortion of gel fibers
D. Both can be re-used for fresh impressions
Syneresis is associated with______________?
A. Hydrocolloids
B. Elastomers
C. Zinc oxide eugenol
D. Plaster of paris
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