Abstract
Chemical substances used during biomechanical preparation of root canals can alter the composition of dentin surface and affect the interaction with restorative materials.ObjectiveThe purpose of this study was to evaluate the microtensile bond strength (µTBS) of a self-etching adhesive system to dentin irrigated with sodium hypochlorite (NaOCl) and ethylenediaminetetraacetic acid (eDTA).Material and MethodsThirty human third molars were sectioned 3 mm below the occlusal surface, polished with 600- to 1200-grit silicon carbide papers, and randomly divided into 3 groups: G1 (control): no irrigating solution; G2: 1% NaOCl; and G3: 1% NaOCl followed by the application of 17% eDTA. The specimens received the self-etching adhesive system (XeNO III - Dentsply), restored with microhybrid composite resin (Z250 - 3M ESPE), sectioned and trimmed to create 4 hourglass-shaped slabs of each tooth. The slabs were tested in microtensile strength in a universal testing machine (emic DL 2000) at a crosshead speed of 0.5 mm/min until fracture. The results were analyzed statistically by ANOVA and Newman-Keuls test.ResultsMean µTBS values and standard deviations in MPa were: G1 = 11.89 ± 4.22; G2 = 19.41 ± 5.32; G3 = 11.34 ± 4.73. 1% NaOCl increased the adhesive resistance significantly (p<0.001/ F=22.5763). The application of 1% NaOCl/17% eDTA resulted in statistically similar µTBS to the control group.ConclusionsNone of the irrigants affected negatively the µTBS of XeNO III to dentin. The use of 1% NaOCl alone resulted in higher bond strength than the other treatments. The combination of 1% NaOCl and 17% eDTA produced similar bond strength to that of untreated dentin.
Highlights
Effective cleaning and shaping of root canals and adequate apical seal are essential to the success of endodontic treatment33, and the appropriate restoration of devitalized teeth is fundamental to prevent bacterial infiltration3,12
The use of 1% NaOCl alone resulted in higher μTBS of the selfetching adhesive system to dentin (p
Considering that the adhesion of restorative materials to dentin of endodontically treated teeth can be altered27 when using irrigating solutions as NaOCl32 and ethylenediaminetetraacetic acid (EDTA) followed by the application of the adhesive system21, and that higher adhesion values can be obtained using adhesive systems in dentin not previously treated by the irrigating solutions35, this study investigated whether self-etching adhesive system could favor an increase in bond strength to dentin
Summary
Effective cleaning and shaping of root canals and adequate apical seal are essential to the success of endodontic treatment, and the appropriate restoration of devitalized teeth is fundamental to prevent bacterial infiltration. Chemical substances used during biomechanical preparation of root canals can alter the composition of dentin surface and affect the interaction with restorative materials. (EDTA) are substances usually used during the endodontic treatment. NaOCl is an auxiliary irrigant used during root canal instrumentation to promote debridement, lubrication, disinfection, tissue dissolution, collagen layer removal and dentin dehydration. EDTA is indicated as a final irrigating agent that produces dentin demineralization and provides an excellent cleaning of the canal walls, improving the penetration of chemical substances and promoting a more intimate contact of the filling material with the radicular dentin. It covalently binds to metal ions and sequesters calcium ions present in hydroxyapatite dentin
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
