Effect of Different Irrigation Protocols on Resin Sealer Bond Strength to Dentin

• Published in: Journal of endodontics Vol. 39; no. 5; pp. 689 - 692
• Main Authors: Prado, Maíra, DDS, MSc, Simão, Renata A., MSc, PhD, Gomes, Brenda P.F.A., DDS, MSc, PhD
• Format: Journal Article
• Language: English
• Published: United States Elsevier Inc 01.05.2013
• Subjects: Adhesiveness; Bicuspid - ultrastructure; Bond strength; Chlorhexidine - chemistry; Composite Resins - chemistry; Dental Bonding; Dental Pulp Cavity - ultrastructure; Dental Stress Analysis - instrumentation; Dentin - ultrastructure; Dentistry; Edetic Acid - chemistry; Endocrinology & Metabolism; Epoxy Resins - chemistry; final flush; Gutta-Percha - chemistry; Humans; irrigants; Materials Testing; Phosphoric Acids - chemistry; resin-based sealers; Root Canal Filling Materials - chemistry; Root Canal Irrigants - chemistry; Root Canal Preparation - instrumentation; Smear Layer; Sodium Hypochlorite - chemistry; Stress, Mechanical; Therapeutic Irrigation - methods; Tooth Apex - ultrastructure; irrigants; Bond strength; final flush; resin-based sealers
• ISSN: 0099-2399; 1878-3554
• DOI: 10.1016/j.joen.2012.12.009

Abstract Introduction The aim of this study was to evaluate the influence of different irrigation protocols on resin-based sealer bond strength to dentin and the associated failure pattern. Methods One hundred eighty single-rooted premolars were used. Roots were divided into 18 groups according to the irrigation protocol used and instrumented using 5.25% NaOCl or 2% chlorhexidine (CHX) gel as chemical auxiliary substances and 17% EDTA or 37% phosphoric acid for smear layer removal. Finally, CHX solution was used as the final irrigant in some groups. Root canals were filled with either gutta-percha and AH Plus (Dentsply, Petropolis, RJ, Brazil) (GP/AH) or Resilon/Real Seal SE (SybronEndo, Orange, CA). Bond strength was measured by the push-out test. Additionally, failure patterns were classified as adhesive, cohesive, and mixed. Data were statistically analyzed by Kruskal-Wallis and Mann-Whitney U tests. Results In the GP/AH groups, high bond strength values were obtained when NaOCl was associated with phosphoric acid with (6.9 ± 3.9) and without (7.4 ± 3.8) a final flush with CHX. However, when CHX gel was used, the association with EDTA with (7.5 ± 3.2) and without (6.0 ± 2.3) a final flush with CHX solution showed better results. The GP/AH groups mainly showed a cohesive failure pattern. Evaluation of Resilon/Real Seal SE showed that higher bond strength values were reached when CHX was associated with phosphoric acid with (5.2 ± 3.0) and without (4.2 ± 2.0) a final flush with CHX solution. The failure patterns were mainly adhesive. Conclusions Irrigation protocols influenced the bond strength of resin sealers to dentin.