INTERMEDIARY IRRIGATION FOR PREVENTION OF THE PRECIPITATE FORMED FROM THE INTERACTION OF IRRIGANT SOLUTIONS

Abstract

The aim of this study was to evaluate the influence of distilled water (H2O) in preventing the brown-orange precipitate observed after the interaction between sodium hypochlorite (NaOCl) 2.5% and chlorhexidine (CHX) 2%. Fifty canines were instrumented, longitudinally divided, and analyzed under a stereomicroscope at 16x and 40x magnifications. Then, all teeth were reassembled and distributed into 5 groups according to the final irrigation protocol: G1 (control) – 17% EDTA + NaOCl + CHX, with syringe; G2- 17% EDTA + NaOCl + CHX, with syringe + PUI (30s); G3 - 17% EDTA + NaOCl + H2O + CHX, with syringe and, with the exception of H2O, activated for 30s with PUI; G4 - 17% EDTA + NaOCl + H2O + CHX, with syringe + PUI (30s); G5 - 17% EDTA + NaOCl + H2O + CHX, H2O in CUI protocol, and applied with syringe + PUI (30s). The specimens were again analyzed under stereomicroscope. Final images after irrigation were classified by scores (0, 1, 2, 3) according to the amount of precipitate found. The statistical tests were performed with Kruskal-Wallis and Friedman tests (?=5%). In all thirds, G1 had significantly higher scores than the other groups. There was no statistical difference between the experimental groups (p>0.05). There was no difference between the thirds in the experimental groups (p>0.05). Distilled water was effective in preventing precipitate formation when applied with a syringe, PUI and CUI.