Effect of disinfectant solutions on surface roughness of heat cure denture base acrylic resins

During infection control process, disinfection of prosthesis is important. But disinfecting method can cause some changes on dentures surface. The aim of this study was to evaluate the effect of disinfectant agents on surface roughness of denture base materials. Methods & Materials: In this study two chemical disinfectants (sodium hypochlorite 0.5%, glutaraldehyde 2%) and two dentures resin materials (Acropars, Meliodent) were used. 40 acrylic resin samples were made. Changes from baseline for surface roughness at four different times (10 minutes, 30 minutes, 24 hours and 7 days) were recorded. ANOVA and Duncan and T-test analysis compared the mean surface roughness of the groups. Mean variation of surface roughness for Acropars resin in sodium hypochlorite and glutaraldehyde at 24 hours and 7 days was significant (P<0.001). This variation for Meliodent resin 7 days after immersion in hypoclorite 0.5% was significant (P<0.001). Mean variation of surface roughness for Meliodent resin in glutaraldehyde was not significant for the time of the study. Mean surface roughness difference among Meliodent and Acropars resin in glutaraldehyde and sodium hypochlorite after 10 minutes and 24 hours was significant (P<0.001). The difference between these two acrylic resin after 7 days in gluteraldehyde was also significant (P<0.001). Result of this study indicated sodium hypochlorite 0.5% and glutaraldehyde 2% can be used on Acropars only up to a period of 30 minutes. Sodium hypochlorite 0.5% can be used on Meliodent for 24 h. However gluteraldehyde 2% can be used for a longer period.