Syneresis seen in hydrocolloid gel is______________?
A. Seen as water loss
B. Water absorption
C. Shrinkage
D. Gelation
Medical Mcqs
Best material for duplicating cast is_______________?
Best material for duplicating cast is_______________?
A. Agar-agar
B. Alginate
C. Zinc oxide eugenol
D. Plaster of paris
The base paste of the condensation poly sillicone has a low molecular weight dimethyl siloxane with a terminal-group_______________?
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
Hysteresis in a hydrocolloid gel is______________?
Hysteresis in a hydrocolloid gel is______________?
A. Moisture absorption
B. Temperature lag between gelation and liquefaction temperature
C. Phenomenon of conversion of gel into sol
D. All of the above
All of the following can be used to slow down the setting of Zinc oxide eugenol impression paste EXCEPT_________________?
All of the following can be used to slow down the setting of Zinc oxide eugenol impression paste EXCEPT_________________?
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
All of the following statements about Type II silicon impression material are true EXCEPT_______________?
All of the following statements about Type II silicon impression material are true EXCEPT_______________?
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
The Zinc oxide-eugenol impression pastes harden by________________?
The Zinc oxide-eugenol impression pastes harden by________________?
A. Chemical reaction
B. Cold
C. Heat
D. Pressure
Plaster mix____________?
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
A rough / Chalky surface of the cast is due to_______________?
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
The setting expansion of gypsum products can be reduced by________________?
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