Efficacy of different endodontic irrigation protocols on shear bond strength to coronal dentin.

Aim: The purpose of this study was to evaluate the effect of etidronic acid on bond strength to coronal dentin.

Materials And Methods: A total of 75 human mandibular molars were sectioned 3 mm below the occlusal surface and then randomly divided into five groups according to irrigation solution used ( = 15): Group 1: 5 ml 2.5% sodium hypochlorite (NaOCl) +5 ml distilled water; Group 2: 5 ml 2.5% NaOCl + 5 ml 17% ethylenediaminetetraacetic acid (EDTA); Group 3: 10 ml mixture of 5% NaOCl and 18% 1-hydroxyethylidene-1,1-bisphosphonate (HEBP); Group 4: 5 ml mixture of 5% NaOCl and 18% HEBP + 5 ml 17% EDTA; and Group 5: 5 ml mixture of 5% NaOCl and 18% HEBP + 5 ml distilled water. Thereafter, Clearfil SE bond was applied to the dentin surfaces and then, composite build-ups were created using Tygon tubes for the microshear bond strength test. Data were analyzed using the one-way analysis of variance and Tukey test.

Results: When compared to Groups 3, 4, and 5, Groups 1 and 2 showed significantly higher bond strength values ( < 0.05). However, there was no statistically significant difference between Groups 1 and 2 and between Groups 3, 4, and 5 ( > 0.05).

Conclusion: HEBP adversely affected the bond strength of the tested adhesive to coronal dentin.