The Evaluation of the Effects of Different Irrigating Solutions and Laser Systems on Adhesion of Resin-Based Root Canal Sealers

Abstract

The purpose of this study was to evaluate the effects of different laser systems and different irrigating solutions on the adhesion of AH Plus and EndoREZ root canal sealers to human root canal dentin. Laser irradiation can be used to obtain morphological changes in dentin walls that could influence the adhesion values of endodontic sealers. One hundred canine root canals were cleaned and shaped. The specimens were assigned to four groups (n=24). In group I 5% NaOCl (control), in group II 15% ethylenediaminetetraacetic acid (EDTA) followed by 5% NaOCl, in group III Er:YAG laser with 2940 nm wavelength, and in group IV Nd:YAG laser with 1064 nm were used as a final procedure in root canals. In each group, half of the specimens were filled with AH Plus sealer and half with EndoREZ with gutta-percha, using cold lateral compaction. Specimens were sectioned to obtain three slices from each third using a precission saw. The first slice of 1 mm thick dentin disks from each third was subjected to the pushout test (MPa). Results were analyzed by analysis of variance (ANOVA) and Tukey's test (p<0.05). A statistically significant difference (p<0.05) was reported between dentin surface treatments (Er:YAG and control groups). Control (1.60±0.99), EDTA (2.05±1.35), Er:YAG (2.25±1.64), and Nd:YAG (2.13±1.38). AH Plus adhesion values were increased significantly (p<0.05) when the root canal was irradiated with the Er:YAG laser. Nd:YAG laser irradiation increased EndoREZ adhesion values significantly when compared with Er:YAG laser irradiation (p<0.05). In the apical and coronal thirds, AH Plus showed better adhesion than did EndoREZ sealer (p<0.005). In the middle third, there was no statistical difference between AH Plus and EndoREZ. The use of EDTA and different laser systems influenced the bond strength of resin-based root canal sealers.