Regenerative Endodontic Procedure of a Mature Anterior Tooth With Open Apex and Chronic Apical Abscess: A Case Report With 4‐Years Follow‐Up

This case report describes the successful treatment of a mature anterior tooth with an open apex and chronic apical abscess using a regenerative endodontic procedure. A 36‐year‐old man with a history of trauma to tooth 11 at age 10 presented with incomplete root development and an asymptomatic chronic apical abscess. Cone beam tomography revealed a periradicular lesion with buccal bone plate loss. After biomechanical preparation using K‐type files and irrigation with 1% sodium hypochlorite, calcium hydroxide was placed as intracanal medication for 14 days. Bleeding was induced by overinstrumenting the periapical tissues with a #25 K‐file, and a bioceramic material was placed over the blood clot, followed by a composite resin coronal seal. At the 4‐year follow‐up, the patient was asymptomatic, with complete bone plate formation and no periradicular lesion or root resorption, although no hard tissue formation or changes in root canal morphology were observed.