Application of Hyperpure Chlorine Dioxide for Regenerative Endodontic Treatment of a Root-Canal-Treated Immature Tooth with External Cervical Resorption and Periapical Lesion: A Case Report

The consequences of traumatic injuries are pulp necrosis, periapical inflammation, and possible external cervical resorption (ECR). concomitant cessation root maturation dentinogenesis in premature teeth result a fragile tooth. Revascularization the might be an alternative treatment option. A 12-year-old patient was referred for retreatment chronic apical periodontitis with acute exacerbation after canal upper central incisor. During gutta-percha removal, ECR detected. First, it closed internally Biodentine, followed by composite closure cone beam computed tomography evaluation. In first session, chemomechanical cleaning aided sodium hypochlorite hyperpure chlorine dioxide, dressed Ca(OH)2 until next session. only low-toxicity, but adequate, bactericide dioxide applied irrigation, before provocation bleeding into canal. blood clots were covered tooth restored filling. 24-month follow-up, clinical signs/symptoms had disappeared, lesion resolved. Increased thickness third decreased size foramen conclusion, regenerative endodontic procedures could potentially used to retreat immature persistent resorption.