Author/Authors :
Abuná, Gabriel State University of Campinas - Piracicaba Dental School - Department of Restorative Dentistry, Division of Dental Materials, Brazil , Felizardo, Klissia R. State University of Campinas - Piracicaba Dental School - Department of Restorative Dentistry, Division of Dental Materials, Brazil , Bacchi, Atais State University of Campinas - Piracicaba Dental School - Department of Restorative Dentistry, Division of Dental Materials, Brazil , Correr-Sobrinho, Lourenço State University of Campinas - Piracicaba Dental School - Department of Restorative Dentistry, Division of Dental Materials, Brazil , Sinhoreti, Mário A. State University of Campinas - Piracicaba Dental School - Department of Restorative Dentistry, Division of Dental Materials, Brazil , Correr, Américo B. State University of Campinas - Piracicaba Dental School - Department of Restorative Dentistry, Division of Dental Materials, Brazil , Feitosa, Victor P. State University of Campinas - Piracicaba Dental School - Department of Restorative Dentistry, Division of Dental Materials, Brazil
Abstract :
Objectives: The aim of this study was to assess the effects direct or indirect water exposure on the 3 months hydrolytic degradation of three dentin bonding agents. Materials and Methods: The samples were divided in three groups: Clearfil SE Bond, Clearfil S3, Adper Singlebond 2; and the samples were restored with Filtek Z350. Subsequent to the restorative procedures, the specimens of each group were divided into three subgroups (immersed in water deionised): Control (24h-37ºC), Direct Water exposure DWE for 3 months (37º), Indirect water exposure (IWE-3m) with enamel margins for 3 months (37ºC). After the storage the samples were sectioned into sticks and μTBS testing (EZ test) and Scanning Electronic Microscopy assessed the failure mode. The μTBS data were statistically analysed using two-way ANOVA and Tukey’s test at α=0.05%. The samples were processed for nanoleakage evaluation immersed in 50 wt% ammoniacal silver nitrate (24 h), rinsed and immersed in a photo-developing solution for 8 h. Results: After 3 months CSE was the least affected by water degradation regardless the aging strategy. IWE afforded very little variation on μTBS after 3 m. Intense nanoleakage was observed with DWE groups with increases incidence of mixed failures instead Conclusions: Bonded dentin margins are more prone to hydrolytic degradation than resin-enamel interfaces. The increased nanoleakage and the drop of bond strength showed this.
NaturalLanguageKeyword :
Hydrolytic degradation , bonding , Scanning electron microscopy , dentin , enamel
