A. Rapid spatulation results in decreased setting time
B. 2% potassium sulphate is accelerator
C. Citrates are retarders
D. All of the above
Plaster mix____________? Read More »
Dental Materials, Gypsum Products, Medical Mcqs A. Not waiting for 20 min before pouring
B. High speed accelerator
C. Air incorporation in the mix
D. All of the above
A rough / Chalky surface of the cast is due to_______________? Read More »
Dental Materials, Gypsum Products, Medical Mcqs A. Increased spatulation
B. Adding potassium sulfate
C. Less water powder ratio
D. Allowing setting under water
The setting expansion of gypsum products can be reduced by________________? Read More »
Dental Materials, Gypsum Products, Medical Mcqs A. Na2 So4
B. Nacl
C. Citrales
D. K2 So4
Most commonly used retarder in gypsum_____________? Read More »
Dental Materials, Gypsum Products, Medical Mcqs A. Impression plaster
B. Model plaster
C. Stone plaster
D. Die stone
Gypsum product having least expansion_____________? Read More »
Dental Materials, Gypsum Products, Medical Mcqs A. Testing the strength of plaster of paris
B. Evaluating the setting time of plaster of pris
C. Testing the metal hardness
D. Testing the purity of noble metals
Gillmore needle is used for_______________? Read More »
Dental Materials, Gypsum Products, Medical Mcqs A. Difference in solubility of CaSo4 ½ H2O + CaSO4+ 2H2O
B. Reaction between CaSO4+ 2H2O and water
C. Nucleation and growth of CaSo4 ½ H2O crystals
D. Reaction between hemihydrate and hihydrate
Setting of POP is result of______________? Read More »
Dental Materials, Gypsum Products, Medical Mcqs A. Impression plaster
B. Class I stone / Hydrocal
C. Class II stone/Densite
D. Model plaster
Type I gypsum product is also called_______________? Read More »
Dental Materials, Gypsum Products, Medical Mcqs A. Is wet calcined hemihydrate
B. Has porous and irregular crystals
C. Is a – hamihydrate
D. Has a W / P of 0.2
Plaster of paris _____________? Read More »
Dental Materials, Gypsum Products, Medical Mcqs A. 0.05
B. 0.10
C. 0.15
D. 0.20
