Non-Surgical Retreatment of a Previously Inadequately Filled Maxillary Molar Using Fanta AF F-One Rotary System: A Case Report

Abstract Endodontic retreatment is required when residual infection or inadequate obturation compromises the success of a previous root canal therapy. This report describes the successful non-surgical retreatment of a maxillary molar with periapical radiolucency using the Fanta AF F-One rotary system. Following removal of the old filling material, the canals were reshaped, disinfected, and obturated with a bioceramic sealer. Radiographic follow-up revealed complete periapical healing and functional recovery of the tooth. Introduction Endodontic failures often result from incomplete debridement, missed canals, or insufficient sealing. Non-surgical retreatment remains the preferred method to re-establish canal cleanliness and hermetic obturation while preserving tooth structure. Modern NiTi rotary instruments, such as the Fanta AF F-One system, combine flexibility, cutting efficiency, and controlled taper design…