Placing cast under tap water is to be avoided as______________?

Gypsum Products 25/08/2021

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

Related Mcqs:

    Model plaster (white) used to cast study models before mixing with water, is largely composed of____________?
    A. CaO B. CaCO3 C. (CaSO4)2-½H2O D. CaSO4-2H2O...
    In plaster of paris the setting time is primarily altered by_________________?
    A. Altering P / L Ratio B. Altering temperature of mixing water C. Speed and length of hand spatulation D. Addition of accelerators and retarders...
    The β (Beta) hemihydrate of gypsum requires more water to float its powder particles because______________?
    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...
    Beta hemihydrate particles absorb______________?
    A. More water B. Less water C. no water D. None of the above...
    The main difference between dental stone and dental plaster is______________?
    A. Chemical composition B. Self life C. Sharpe and size of particles D. Solubility in water...

Leave a Reply

Your email address will not be published. Required fields are marked *