A Micro-Computed Tomographic Study Of Retreatment Of Bioceramic Sealer

To determine the presence of residual root canal filling material TotalFill® BC Sealer and the reestablishment of working length and apical patency after retreatment procedures with two rotary files systems. Thirty extracted human maxillary incisors were instrumented up to a size 30.04 and obturated with TotalFill BC Sealer (FKG, Switzerland) and gutta percha by single cone technique. After 14-days, teeth were randomly assigned to 2 groups and 6 subgroups and canals were retreated: Group 1A - D-Race/XP-endo Shaper/XP-Endo Finisher R; Group 1B - D-Race/XP-endo Shaper/XP-Endo Finisher R/ultrasonic agitation; Group 1C - D-Race/XP-endo Shaper/XP-Endo Finisher R/EndoActivator; Group 2A - ProTaper Universal Retreatment files; Group 2B - ProTaper Universal Retreatment files/ultrasonic agitation; Group 2C - ProTaper Universal Retreatment files/EndoActivator. The samples were scanned using micro-CT before and after retreatment. Residual material debris was observed in all samples. There was statistically significant difference in the percentage of the remaining filling material, reestablishment of working length and apical patency after retreatment with ultrasonic or sonic agitation compared to subgroups A (p<0.05). The percentage of remaining filling material was significantly lower at the apical third in group 2B (p<0.05), otherwise, no significant differences were observed among the coronal and middle thirds in groups 1B/1C/2B/2C. Within the limitations of this study, the efficacy of filling material removal was more than 92% using D-Race rotary instruments, XP-ENDO files and ultrasonic agitation.