The effect of disinfection procedure and storage on wettability of hydrophilized condensation silicone impression materials

Abstract

Background: a newly developed hydrophilized condensation silicone impressionmaterial claimed to be hydrophilic, but exposure to disinfection procedure andstorage could alter the wettability of impression material. Thus, the aim ofpresent study was to evaluate the effect of impression disinfection by immersionin 0.5% NaOCl for 10 mints. on wettability of hydrophilized condensationsilicon . In addition, effect of storage after disinfection for two hours, measuredby contact angle of dental stone mix with impression surface.Materials and Methods: Hydrophilized condensation silicone (putty and wash type)tested with type III dental stone and 0.5% sodium hypochlorite disinfectantsolution were used in this study. Disinfection procedure by immersion for 10mint. Wettability was evaluated in simulation of regular clinical situation pouring2ml. of stone slurry on impression surface to form stone patty. Each pattysectioned into two halves, scanned with flat bed scanner and images printed.Dental stone mix contact angle with impression surface was measured withprotractor from scanned image of the cross section of stone patty. Measurementswere preformed before and after disinfection procedure, also after storage inhumid environment for two hours.Results: The putty type showed significant difference p<0.001 when subjected todisinfection and storage. The wash type showed no significant difference p>0.05when subjected to disinfection or storage. Both types together they were notaffected by disinfection procedure p>0.05, but storage had significant effectp<0.001 on wettability.Conclusions: For the hydrophilized condensation silicone using both types together(putty + wash) for making impression improve wettability even afterdisinfection. Delay pouring impression for two hours cause deterioration ofimpression wettability.