Gypsum Products

A. To regulate the setting expansion
B. Regulate setting time
C. Acts as retarder
D. None

A. Slower the hygroscopic expansion
B. Greater the hygroscopic expansion
C. Normal setting expansion
D. No setting expansion

A. 1
B. 4
C. 12
D. 25

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. Altering P / L Ratio
B. Altering temperature of mixing water
C. Speed and length of hand spatulation
D. Addition of accelerators and retarders

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