dimensional stability of polyether, alginate, and silicone impression materials after disinfection with 2% sanosil through the immersion technique

background to prevent diseases transmission, infection control in dental offices without reducing the accuracy and dimensional stability of impression materials is very important. objectives the aim of this study was to evaluate the effects of sanosil disinfectants on the dimensional stability of some usual impression materials. materials and methods three types of impression material, namely, alginate, condensational silicone, and polyether, were used in this study. impressions were obtained from the master steel model. fifteen impressions of each material (control group) were immersed in water for ten minutes and impressions of study groups were disinfected by immersion in 2% sanosil for ten minutes. then impressions were poured by type iii gypsum according to the manufacture's instruction. dimensions of casts in the two anterior dimensions, i.e. interval between the anterior abutments and interval between anterior-posterior abutments, were recorded by a digital caliper with the accuracy of 0.01 mm. data were analyzed with spss through two-way anova test. results the results showed that there was no significant difference in the mean dimension of casts prepared by different impression materials in anterior and anterior-posterior dimensions in comparison to the original model after disinfection with sanosil. conclusions the study revealed that disinfection with 2% sanosil has no significant effect on casts dimensions of alginate, silicone, and polyether impression and dimensional stability is maintained.