Abstract

The aim of this study was to compare the dimensional changes in casts poured from irreversible hydrocolloid impression materials internally disinfected with different concentrations of chlorhexidine. In this in vitro study, type IV dental stone casts (Elite Stone, Zhermack) were fabricated from irreversible hydrocolloid impressions of Frasaco typodont dentulous model. The irreversible hydrocolloid powder (Kromopan, Lascod Italy) was mixed with four different concentrations of chlorhexidine solution at 0.05%, 0.10%, 0.15% and 0.2%. Distilled water was used as control. Twenty casts were made for each mixing solution. Four measurements including cross arch width (AB and CD) and sagittal plane distance (BC and DA) were measured with a Mitutoyo digital caliper with accuracy up to 0.01 mm. Data was analyzed using SPSS version 22. ANOVA and Post Hoc Tukey’s test were used to compare the mean differences among the groups. The mean cast measurements showed no significant difference in any of the three out of four measurements among the groups with different concentrations of chlorhexidine solutions, with p values being 0.716, 0.64 and 0.35 respectively. However, the DA measurement was significant with p = 0.002. Different concentrations of chlorhexidine solutions used to internally disinfect hydrocolloid impression materials have no significant impact on the dimensional stability of the casts.

Keywords: Irreversible Hydrocolloid Impressions; Dental Stone Casts and Chlorhexidine Solution

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