Dental Model plaster (white) used to cast study models before mixing with water, is largely composed of: A CaO B CaCO3 C CaSO4 • ½H2O D CaSO4 • 2H2O 💡 Explanation Model plaster (white) used to cast study models before mixing with water, is largely composed of: ✓ Correct Answer: C. CaSO4 • ½H2O