Influence of immersion into peracetic acid on dimensional stability and surface tension of silicone

Abstract

The aim of this study was to evaluate the influence of immersion into peracetic acid on the dimensional accuracy and surface tension of silicone materials. For the dimensional accuracy assay, 5 specimens were made for the control group and 5 for the treatment group, a ruled block was used as described in American Dental Association (ADA) spe- cification number 19. The measurements were made immediately after preparation and immersion and after 24hours, using a measuring mi- croscope with an accuracy of 0,005 mm. For the surface tesnion assay, 5 specimens were made, and the measurements of contact angle were read with the software Adobe Photoshop 7.0.1. The data were analyzed with t Student test (p < 0,05) and no significant differences between control and treatment groups were found. The short-term disinfection of the im- pression materials tested had no influence on the evaluated properties. Key words: disinfection, dimensio- nal accuracy, surface tension, sili- cone materials.