Journal of Conservative Dentistry
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ORIGINAL ARTICLE
Year : 2017  |  Volume : 20  |  Issue : 5  |  Page : 302-306

The effects of endodontic substances and naturally reducing agents on the bond strength of epoxy resin-based sealer to root dentin


1 Department of Restorative Dentistry, College of Dentistry, University of Passo Fundo, Passo Fundo, RS, Brazil; Department of Restorative Dentistry, College of Dentistry, University of Illinois at Chicago, Chicago, IL, USA
2 Department of Restorative Dentistry, College of Dentistry, University of Illinois at Chicago, Chicago, IL, USA

Correspondence Address:
Dr. Doglas Cecchin
Universidade de Passo Fundo, Campus I, Faculdade de Odontologia, BR 285, Km 171, Bairro São José, Caixa Postal 611, Passo Fundo, Rio Grande do Sul

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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/JCD.JCD_400_16

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Aim: To evaluate the effects of sodium hypochlorite (NaOCl), chlorhexidine (CHX), and two naturally derived reducing agents on the bond strength of epoxy resin-based sealer to root dentin. Materials and Methods: A total of 60 single-rooted human teeth were prepared using ProTaper (Dentsply Tulsa Dental Specialties, Johnson City, TN, USA) and an irrigation protocol including 5% NaOCl or 2% CHX gel, and ethylenediaminetetraacetic acid (EDTA), for smear layer removal. The following subgroups (n = 10) were also assessed according to the naturally derived reducing agent used: no agent (control group); grape seed extract (GSE); and green tea. Root canals were filled with gutta-percha and AH Plus (Dentsply DeTrey, Konstanz, Germany). Bond strength was measured using the push-out test, and statistical analyses were performed using ANOVA; failure patterns (modes) were classified as adhesive, cohesive, or mixed. The types of failure modes were evaluated using the Chi-squared test at α =0.05. Results: The irrigation protocols demonstrated similar bond strength values (P > 0.05). However, the Chi-squared test revealed significant differences in failure mode among the groups (P < 0.05). An increase in the incidence of adhesive failures was observed for the NaOCl and EDTA groups. The other groups demonstrated a prevalence of mixed and cohesive failures. Conclusion: The irrigation protocols and use of naturally derived reducing agents had no effect on the bond strength of the resin-based sealer to dentin; however, improvement was evident in the adhesion quality of AH Plus to NaOCl-treated root dentin, due to the prevalence of cohesive failure.


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