Dental Placing cast under tap water is to be avoided as A a) H2O interferes with hygroscopic expansion B b) H2O Inhibits polymerization of dental resin C c) H2O interferes with crystallization of dihydrate D d) Gypsum is slightly soluble in water and the surface of the cast will be eroded 💡 Explanation Placing cast under tap water is to be avoided as ✓ Correct Answer: D. d) Gypsum is slightly soluble in water and the surface of the cast will be eroded