Dual Rinse ® HEDP increases the surface tension of NaOCl but may increase its dentin disinfection efficacy

AbstractThe aim of this study was to evaluate the surface tension and the antimicrobial activity in infected dentin of a NaOCl solution combined with an etidronate powder (Dual Rinse® HEDP), compared to pure NaOCl and the classic NaOCl  + EDTA irrigating sequence, respectively. The surface tension of three irrigants was measured by Wilhelmy technique. To evaluate the antimicrobial activity of the solutions, 26 human teeth were contaminated for 5 days withE.faecalis. After bacterial contamination, ten samples were irrigated with NaOCl followed by EDTA, another ten with NaOCl/Dual Rinse® HEDP, and four were used as positive controls. Two specimens not contaminated were used as negative controls. After live/dead BacLight staining, samples were examined by CLSM for analyzing % of residual live and dead cells. Comparison of bacterial viability between and within groups was performed using the Mann –Whitney test for independent samples and the Wilcoxon signed-rank test, respectively. The mean surface tension of EDTA was significantly lower than that of the other irrigants tested (p <  0.001). Conversely, the surface tension of NaOCl/Dual Rinse® HEDP solution was significantly higher than that of all the other solutions (p <  0.001). Residual bacterial viability in the NaOCl/Dual Rinse® HEDP (1.71%) was significantly lower (p = 0.019) than in the NaOCl + EDTA group (3.77%). All of the experimental groups showed significantly lower proportion of viabl...

Source: Odontology - June 12, 2019 Category: Dentistry Source Type: research