Abstract:

Aim: To evaluate the bond strength of resin-based sealer to dentin after using different final irrigation solutions, one of which is alexidine dihydrochloride (ALX). Material and method: A total of 90 human maxillary central teeth were used. The groups were designed according to the final irrigation solution applied, as follows: Group 1: 17% ethylenediamine tetra-acetic acid (EDTA), Group 2: QMix, Group 3: 2% chlorhexidine gluconate (CHX) , Group 4: 1% ALX, and Group 5: Distilled water (Control group). All canals were obturated with gutta-percha and AH Plus. For bonding strength measurement, three horizontal sections of 2 mm thickness were obtained from each sample towards the coronal to apical. Push-out force was applied until bond failure occurred. Modes of failure were classified by examining each sample using a stereomicroscope as follows: adhesive (sealer-dentin or sealer-gutta-percha interface), cohesive (failure within sealer or dentin), mixed (failure in both the sealer and dentin). The Kruskal-Wallis H test was used for comparison among the groups (p < 0.05). Results: The mean highest values were obtained from the coronal, middle and apical regions, respectively (p < 0.05). The highest significant values for bonding strength was obtained in the EDTA group and the lowest in the control group (p < 0.001). There are no statistical differences among QMix, CHX and ALX groups, except for the coronal third, where the bond strength for the QMix was higher compared to the other two groups (p=0.001). All samples showed the cohesive failure type in most. Conclusion: Bonding strength is high when EDTA is used in any of the three parts of the root canal. ALX showed similar bond strengths to CHX. Key Words : AH Plus, alexidine, bond strength, chlorhexidine, EDTA, Qmix

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