Abstract

The use of endodontic ultrasound improves the irrigating properties of 5% NaOCl, on the other hand its use on CHX 2% accelerates its degradation and production of parachloroanilina. The objective of this study was to quantify the amount of PCA formed by the use of endodontic ultrasound in an endodontic treatment using 5% NaClO and 2% chlorhexidine as irrigators. Materials and methods: In an ex-vivo study, 30 premolars divided into control and two experimental groups underwent a protocolized endodontic treatment and divided into 13 phases, using 5% sodium hypochlorite and 2% chlorhexidine. Endodontic ultrasound was used in phases 4, 12 and 13. In phases 5,6,7,9,10 and 11, NaOCl was quantified by UV spectrophotometry. In phase 12 and 13 its quantified PCA by visible spectrophotometry. Results. The highest hypochlorite values were found in experimental group No. 1, values found in control group and experimental group No. 2 are much smaller and similar to each other. PCA is found in the three groups, being higher in the experimental group N ° 1 worth 1.09 x 10-2mg/ml. The measured values of PCA in experimental group No. 2 are inferior to group 1 but much higher than the control group. Conclusions. Parachloroaniline was found and quantified in the three groups under study. The highest amount of PCA found is located in the experimental group No. 1, where it was activated with endodontic ultrasound on 5% NaOCl. The maximum amounts of PCA formed could produce immunotoxic type effects