Comparative Evaluation of Action of RISA and Sodium Hypochlorite on the Surface Roughness of Heat Treated Single Files, Hyflex EDM and One Curve- An Atomic Force Microscopic Study

Aim: The aim of the study is to evaluate the action of RISA and Sodium hypochlorite on the surface roughness of heat treated single files, Hyflex EDM and One Curve using an Atomic Force Microscope.  Materials and Methods: A total of ten new files from each brand (Hyflex EDM and One Curve were taken. Before immersion , all the files were observed under Atomic Force Microscope to determine the surface roughness. Five files from Hyflex EDM were immersed in 5.25% sodium hypochlorite and five files were immersed in RISA solution. Five files from One Curve were immersed in 5.25 % sodium hypochlorite and the other five files were immersed in RISA solution. The dynamic immersion of the files were done by attaching it to an endomotor at constant speed 300 rpm and torque 2.5 N Cm into plastic tubes .After immersion, all the files were kept on the staging platform of AFM and 3mm section of the tip was examined for surface roughness.  Results: Within the limitations of this study, Hyflex EDM files immersed in sodium hypochlorite showed highest increase in surface roughness. Among the irrigant solutions used, increase in surface roughness was more for files immersed in Sodium hypochlorite as compared to files immersed in RISA solution.