Placing cast under tap water is to be avoided as______________?
Correct answer: D. Gypsum is slightly soluble in water and the surface of the cast will be eroded
- 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
Explanation
Gypsum is slightly soluble in water, so running tap water can dissolve and erode the cast surface. This is why casts should not be placed directly under a stream of water.
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