Aim:The present study aims to examine the impact of various laser-assisted irrigation activation techniques on the removal of Ca(OH)2 from coronal and apical artificial grooves prepared in canal walls. Materials and Methods:The root canal instrumentation procedures of sixty extracted mandibular premolar teeth were performed using ProTaper Universal system. The grooves were prepared in the coronal and apical regions of the root canals. Ca(OH)2 was placed into the grooves for 1 week. Teeth were allocated into 4 groups according to the irrigation techniques of EDTA (n=15): needle irrigation, PIPS, Nd:YAG laser, and Er:YAG laser. The percentage of Ca(OH)2 remnants was quantified using image analysing software (Image J). For the statistical analysis, one-way analysis of variance and post-doc LSD tests were used (P = .05). Results: For apical grooves, PIPS and Er:YAG laser groups were statistically more effective than needle irrigation and Nd:YAG laser groups (P < .05). No significant difference was determined between PIPS and Er:YAG laser groups; needle irrigation and Nd:YAG laser groups (P > .05). For coronal grooves, all of the groups showed statistically similar results (P > .05). Conclusion: Within the limitations of this laboratory study, Er:YAG laser and PIPS techniques enhanced Ca(OH)2 removal ability of EDTA in apical region.
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