Effects of Different Disinfectant Additives on Compressive Strength of Dental Stone


Purpose: The aim of this study was to analyze the compressive strength of dental stone after incorporating different disinfectant solutions during stone models preparation. Materials and methods: A one hundred eighty die stone type IV cylindrical specimens were prepared with dimensions of 20mm diameter and 40 mm height by adding different disinfectants (Sodium hypochlorite 1% and 0.5%, Chlorhexidine 2% and 1%, glutaraldehyde 2% and 1%, Iodine 4% and 2% and a control group without additives) divided into 18 groups, 10 specimens per each group (each two groups identical of same disinfectant and same concentration). Then one of each two identical groups was tested to evaluate its compressive strength after air drying for 24 hours while the other group tested after 48 hours.Results: Chlorhexidine and glutaraldehyde in both concentrations and drying time as well as sodium hypochlorite 0.5% showed no significant difference in compressive strength compared to control group, and they showed higher values compared to sodium hypochlorite 1%. While Iodine groups in both concentrations and drying times showed the least values among all groups.Conclusions: According to the results of this study, Chlorhexidine and glutaraldehyde 1-2% as well as 0.5% sodium hypochlorite can be added to disinfect die stone casts without affecting their compressive strength, while both sodium hypochlorite at a higher concentration and iodine at any concentration are not recommended to be used for this purpose .