To evaluate the dimensional accuracy and hardness of gypsum cast on repeated immersion in sodium hypochlorite and peroxygenic acid: An in-vitro study

Abstract

Microbes, fungi, and viruses present in the dental atmosphere have been linked to debilitating and life threatening diseases. Transmission of infected materials from the clinic to the dental laboratory results in a high level of cross contamination. The objective of the study was to evaluate the dimensional accuracy and hardness of gypsum cast on repeated immersion in 0.525 percent Sodium hypochlorite and 1percent Peroxygenic acid. 72 specimens of type 3 dental stone were created. 24 specimens were immersed in slurry, 0.525 percent Sodium hypochlorite, and 1 percent Peroxygenic acid solutions for 30 minutes, then air dried for 24 hours. For testing purposes, this process was repeated seven times. The hardness of stone cylindrical specimens was evaluated using a Rockwell hardness testing equipment. The values obtained by Kruskal-Wallis and Mann-Whitney tests, which were employed for statistical analysis at α=0.05, were used to evaluate dimensional accuracy and hardness. When compared to the 0.525 percent Sodium hypochlorite and slurry treatments, the specimens treated with 1 percent peroxygenic acid showed more dimensional change. Maximum hardness was achieved with 1 percent peroxygenic acid. Slurry & 0.525 percent sodium hypochlorite is dimensionally stable than 1 percent Peroxygenic acid. Hardness of type III dental stone samples disinfected by 1 percent Peroxygenic acid was the highest. Given the other benefits of virkon as a disinfectant agent, as well as the lowest reduction in gypsum mechanical strength, it can be recommended for the disinfection of stone casts in the clinic and laboratory.