Abstract

The aim of this study was to evaluate and compare the dimensional stability and surface quality of the gypsum casts retrieved from disinfected polyvinylsiloxane impressions at 10, 30 min and 1 h by immersion and spray method. Six impressions of each type of silicone material were made from a master model. In each group, three of the impressions were disinfected, while the other three were considered as control. The impressions were rinsed for approximately 10 s under cold tap water and disinfected by an immersion or spray method for 10, 30 min and 1 h. All impressions were poured in type IV die stone. The dimensional stability of the impressions was evaluated using travelling microscope and the surface quality was assessed with perthometer. The values were statistically analyzed using analysis of variance (ANOVA) and Tukey honestly significant difference (HSD). The dimensional stability of gypsum casts retrieved from disinfected silicone impressions did not show significant changes; however, there was a significant difference (1% level) in the Ra values used to determine the surface quality, although these are not thought to be clinically significant.

Key words: Disinfection, dimensional stability, surface quality.

Abbreviation

Mol to Mol,  Molar to Molar; Mol to Ant, Molar to anterior; B to L,Buccolingual; M to D,  Mesiodistal; O to G,  Occlusogingival.