Medical MCQs

5099 MCQs  (Page 84 of 510)

Before pouring an elastic impression it is washed with slurry of water and stone to______________?
A. Increase gel strength
B. Prevent syneresis
C. Prevent distortion
D. Wash off saliva on impression
Which material is the most difficult to remove from the patients mouth ?
A. Metallic oxide paste
A. Silicone impression material
B. Reversible hydrocolloid
C. Impression plaster
Impression compound has which of the following characteristic property ?
A. Low thermal conductivity
B. High flow property
C. Degradation is presence of mositure
D. Remain distortion free up to 72 hrs. pouring can be safely delayed
Agar syringe material can be used with/as______________?
A. Agar
B. Alginate impression material
C. Both of the above
D. Primary impression
The setting expansion of gypsum products can be reduced by________________?
A. Increased spatulation
B. Adding potassium sulfate
C. Less water powder ratio
D. Allowing setting under water
A rough / Chalky surface of the cast is due to_______________?
A. Not waiting for 20 min before pouring
B. High speed accelerator
C. Air incorporation in the mix
D. All of the above
Plaster mix____________?
A. Rapid spatulation results in decreased setting time
B. 2% potassium sulphate is accelerator
C. Citrates are retarders
D. All of the above