Endodontic Reapproach in a Tooth With External Resorption: Case Report.

Introduction: Endodontists face various challenges, and some factors are associated with endodontic treatment failure, such as the presence of resistant microorganisms resulting from inefficient disinfection and nonadhesive coronary sealing. The quality of the execution of the operative protocols, cautious irrigation, and the presence of a hermetic seal from the crown to the apex lead to successful endodontic retreatment. Methods: This descriptive cross-sectional study approached a female patient, aged 30 years. The data obtained from the literature were collected from PubMed, SciELO, and Google Scholar websites, while the clinical data were obtained from the Teaching Clinic of the Dentistry Postgraduate Department. This study was aimed at reporting a clinical case of conventional endodontic retreatment in Tooth 21 with external apical resorption. Initially, periapical radiographs and cone beam computed tomography were requested from the unit for better assessment and management of the case. Results: The treatment was carried out with bioceramic cement; in the present case, its use combined with good operative protocols was effective, using simple tools for a successful treatment, ensuring the patient's well-being and quality of life. Conclusions: The retreatment on Tooth 21, using the existing biological and technological conditions, was effective in generating periodontal health for the associated tissues.