Análisis por difractometría de rayos x del sistema wane one gold después del uso clínico y esterilización

Abstract

Introduction: The root canal biomechanical preparation uses Nickel Titanium (NiTi) instruments which have memory shape and super elasticity properties. These can suffer alterations after use and sterilization that may lead to some complications. Objective: To analyse crystallographic alterations and surface modifications of primary and medium Wave One® Gold system files on upper and lower molars with slight to moderate curvatures after clinical use and sterilization through X-Ray diffractometry and SEM. Method: The sample consisted on 2 Wave One® Gold rotatory system files: the Primary one (25/0.7) and the Medium one (35/0.6), both were used on 6 slight to moderate curved molars measured with computed tomography. X-Ray diffractometry and SEM were used to analyse structural and superficial changes on the files after use and sterilization. Results: XRD analysis revealed 4 peaks 110, 200, 211 and 220 atomic planes in austenite. Primary and Medium Files did not have changes in intensities peaks after completion six molars and sterilization. SEM examination revealed the main changes in the apical and medium third. (milling grooves, debris, metal strip and micro-cracks). Primary file had three Blunt cutting edges and Medium file had just one. Conclusions: Primary and Medium Wave One® Gold files showed no significant changes after completion six molars with curvatures less than 20* and five autoclaving cycles.