Aim: To contrast the efficiency of cleaning of Ultra sonic efficiency versus the XP-endo Finisher R in cleaning the dentinal wall after obturating material removal with Micro CT. Method: 30 human lower premolars have one straight canal and fully developed apex were used in this study. In order to standardize, every tooth has decoronated to a distance of 15 mm from the apex. Revo-S files were used to prepare the canals. Gutta percha cones sized #25 were used to fill the canals, along with resin sealer. Retreatment procedures were done using EdgefileXR retreatment files. The premolars were subsequently randomized split into 3 identical groups of 10 premolars each in accordance with the additional cleaning technique. Group 1: Control group (No additional ultimate cleaning), Group 2: Ultra sonic activation, and Group 3: XP-endo Finisher R. Micro CT was used three time for every specimen for building 3D volumetric models by mm3 of the remaining material (after obturation, after filling material removal, and after using the additional cleaning methods). Results: The XP-endo Finisher R demonstrated the best efficacy (reducing remaining filling material by 79%), followed by Ultra sonic (reducing remaining filling material by 70%) in comparing with the control group (reducing remaining filling material by 0%). Conclusion: XP-endo Finisher R and Ultrasonic are both advised to be used as additional methods for cleaning the dentinal wall after removal the filling materials.