Aim:This study aimed to estimate the effect of different obturation techniques using a Guttaflow2 sealer on the amount of residual filling material at the apical region after retreatment, focusing on factors such as canal cleanliness, residual material quantity, and ease of retreatmentMethod:Thirty fresh extracted human mandibular premolar teeth were used in this study. Afterwards the preparation of the root canals using hand protaper technique to F3, the teeth were divided into three groups with 10 sample in each group. G1 obturated with single cone technique, G2 obturated with Lateral Condensation, and G3 was obturated with Soft Core. Guttaflow2 sealer was used After the incubation period of two weeks, obturation materials in all samples were removed using the ProTaper Universal Retreatment files D1, D2, and D3. all procedure was done in vantom lab in the collage of dentistry/ mustansiriyah university. After mechanical removal, use ultrasonic activation with 5.25% NaOCl for 60 seconds to enhance sealer dissolution. Final irrigation with saline to ensure thorough cleansing. Then, the samples were split longitudinally and examined by a digital stereomicroscope at 12.5X magnification. and the examination of samples done in the Department of Materials Engineering, University of Technology After that, the remnants of root-filling materials at apical area were calculated as a percentage at 3mm from the apical foramen.Results: The ANOVA test revealed no statistically significant difference between the mean values of G1, G2, and G3 (p > 0.05). Higher percentages of unfilled areas were observed in Group 2, followed by group3.Conclusion: The retreatment technique used was incapable of complete removal of filling material within root canal walls, especially at the apical region
sundus naser (Mon,) studied this question.