Effect of disinfection of irreversible hydrocolloid impression materials with 1% sodium hypochlorite on surface roughness and dimensional accuracy of dental stone casts

Abstract

Aim: The aim of this study was to evaluate the effect of disinfection of commercially available irreversible hydrocolloid impression materials with 1% sodium hypochlorite on the surface roughness and dimensional accuracy of dies produced using type IV dental stone. Materials and Methods: Four different brands of irreversible hydrocolloid impression materials were used as follows: Jeltrate Plus without disinfection (GJ), Jeltrate Plus with disinfection (GJD), Hydrogum without disinfection (GH), Hidrogun with disinfection (GHD), Hidrogum 5 Days without disinfection (GH5), Hidrogum 5 Days with disinfection (GH5D), Cavex without disinfection (GC), and Cavex with disinfection (GCD). A total of 80 dies were poured using type IV dental stone and their mean surface roughness was evaluated using rugosimeter (Mitutoyo SJ-400). To conduct the dimensional alteration analysis, type IV dental stone casts were obtained from a matrix made of chemically-activated resin. They were analyzed in a coordinate-measuring machine (Brown and Sharpe). Statistics Analysis: Numerical data were analyzed using analysis of variance (ANOVA) with Tukey′s post hoc test at 5% confi dence interval. Results: Hidrogun 5 Days and Cavex showed the least surface roughness value even after 5 days. There were no significant differences in the dimensional alteration of Jeltrate (GJ and GJD) and Hidrogum (GH and GHD) in relation to the “new brands” Hidrogum 5 (GH5 and GH5D) and Cavex (GC and GCD), even after 5 days of storage. Conclusion: Considering the results obtained, it can be concluded that there was a roughness increase in the die stones poured from irreversible hydrocolloids disinfected with sodium hypochlorite.