1. ADA Council on Scientific Affairs. ANSI/ADA Specification No.25 (2000), an adoption of ISO Standard 6873: 1998 for Dental Gypsum Products. Available at http://www.ada.org/prof/resources/positions/standards/denmat.asp. Accessed March 28, 2004.
2. Restorative dental materials;Craig,2001
3. Contemporary fixed prosthodontics;Rosenstiel,2000
4. Some experiments on the surface hardness of dental stones;Skinner;J Prosthet Dent,1956
5. The effect of model sealant solutions on the properties of gypsum;Sanad;J Dent,1980