Dental The product, which is obtained by calcining gypsum under steam pressure at 120-130°C or by dehydrating gypsum in the presence of sodium succinate, is A Alpha - hemihydrates B Beta - hemihydrates C Calcium sulphate dihydrate D Orthorhombic anhydrate 💡 Explanation The product, which is obtained by calcining gypsum under steam pressure at 120-130°C or by dehydrating gypsum in the presence of sodium succinate, is ✓ Correct Answer: A. Alpha - hemihydrates