efficacy of three different methods in the retreatment of root canals filled with resilon/epiphany se

introduction: the purpose of this study was to evaluate the efficacy of three methods in removal of resilon/new epiphany self-etch (se) soft resin endodontic obturation system. materials and methods: thirty extracted single rooted human teeth were prepared for endodontic treatment and obturated with resilon/epiphany se. the roots were randomly divided into three groups; group 1 roots were retreated using mtwo r/mtwo files; group 2 were retreated using mtwo r/mtwo accompanied with chloroform; and group 3 were retreated using mtwo r/mtwo accompanied with endosolv r. the cleanliness of canal walls was determined using scanning electron microscopy. data were analyzed using anova and lsd tests. results: endosolv r combined with rotary files was more efficient in material removal compared to chloroform combined with rotary files and rotary files alone (p<0.05). also, chloroform combined with rotary file was more efficient than rotary file alone in removing filling material from the root canals. significant difference was found within group 1 between the coronal third compared to the middle and apical thirds (p<0.05). in group 2, there were more material remnants in the apical third (p<0.05). in group 3, there was no significant difference between the three segments of the root canals (p>0.05). conclusion: all techniques left filling material remnants and debris on the root canal walls. endosolv r combined with rotary files most effectively removed filling materials from the root canals, especially in the apical third.