Comparative study on in vitro of the degree of smear layer removal in root canals instrumented with Protaper rotary technique using final irrigation with 17% EDTA followed by sodium hypochlorite (NaOCl) at 5.25% or Qmix.

Abstract

The present study compares the efficacy to remove the smear layer from two of final irrigation systems used in Endodontics. The ability in barrillo dentinario removal awarded by final irrigation with EDTA to 17% followed by sodium hypochlorite (NaOCl to the 5.25%) compared to the level of smear layer remove awarded by final irrigation with Qmix. The irrigants will have a time of 1 minute and a half inside the canal. This study will be done with help of images from the scanning electron microscope from each of the teeth subjected to the proper final irrigation Protocol. Eighteen single teeth between premolars and molars extracted for orthodontic purposes were chosen for this study. Subsequent to the removal of the clinical Crown of each tooth, root canals using Protaper rotary instrumentation technique were established. The canals were constantly irrigated with sodium hypochlorite at the 5.25% after each file. Subsequently, teeth were divided randomly into three distinct groups (positive control, final with EDTA and NaOCl irrigation and irrigation with Qmix). Finally, the canals were subjected to final irrigation with two irrigation systems chosen for the study. Once the final irrigation was done, we proceeded to section the teeth in a longitudinal direction with the porpuse to obtain two parts. The best part would be studied under scanning electron microscope. Photographs were obtained from the scanning electron microscope submitted to quantitative analysis of comparison of areas of dentin tubules without smear layer plugging its entry. Removal of tooth smear percentages were subjected to statistical analysis (Anova and Tukey statistical systems) and it was concluded that the Qmix gives best results for the removal of the smear layer that final irrigation with EDTA to 17% followed by NaOCl to the 5.25%.