A. Modify setting time
B. Modify setting expansion
C. Modify strength
D. Decrease the porosity
A. H2O interferes with hygroscopic expansion
B. H2O inhibits polymerization of dental resin
C. H2O interferes with Crystallization of dihydrate
D. Gypsum is slightly soluble in water and the surface of the cast will be eroded
A. They are more regular in shape and dense
B. They are more regular in shape and highly porous
C. They are more irregular in shape and porous
D. They are more dense and prismatic in shape
A. Stone
B. Plaster
C. Investment
D. All of the above
A. Sodium fluoride
B. Potassium fluoride
C. Potassium sulfate
D. Aluminium sulfate
A. Investment
B. Hydrocolloids
C. Amalgam
D. Silicate
A. Setting time
B. Setting expansion
C. Hardness of the set product
D. None of the above
A. Calcium sulphate hemihydrate
B. Calcium phosphate
C. Calcium anhydrate
D. Calcium sulphate dihydrate
A. Impression of single tooth
B. Impression of whole teeth
C. Replica of single tooth
D. Replica of whole teeth
A. Plastic bowl
B. Rubber bowl
C. Glass bowl
D. Metal bowl