Microleakage Evaluation of Adhesive Systems Following Pulp Chamber Irrigation by Sodium Hypochlorite

This in vitro study evaluated the elapsed time of composite restoration following root canal irrigation with Sodium hypochlorite (NaOCl) on sealing ability of total-etch and self-etch adhesive systems. The roof of the pulp chambers and roots (1-2 mm below furcation) of forty human first molar teeth were cut and pulp tissues completely removed. Teeth were randomly divided into two main groups (n=20). Group E (experimental) was irrigated with 5% NaOCl and group C (Control) was left untreated. For the experimental group, after obtruding of root canals with gutta-percha and sealing the cavity with Cavit, the specimens were kept in artificial saliva for two weeks. Then each group was divided into two subgroups according to the total etch or self etch adhesives application; Scotchbond Multi-Purpose and Clearfil SE Bond. The specimens were restored by resin composite associated with each bonding agent; «Z250 and Clearfil Photo core, respectively». Fluid filtration method was used for evaluation of microleakage. Data was statistically analyzed using two-way ANOVA (α =. 05). Two types of dentin adhesive systems showed no statistically significant difference regarding microleakage (P=. 77). NaOCl treated groups demonstrated significantly higher microleakage values than that of the NaOCl untreated groups (P=. 001). The interaction between two factors was not significant (P=0. 78). Waiting two weeks after cavity irrigation with Sodium Hypochlorite did not eliminate microleakage of resin composite restorations.