
Any trauma to immature permanent tooth can cause a interruption in dentin deposition and root formation may cease. The endodontic treatment of such teeth will often become complicated with an uncertain prognosis. This case report describes successful endodontic treatment of an immature maxillary central incisor 4 years after trauma. A maxillary right central incisor was treated for periapical abscess in a 14-year-old boy who had met with trauma 4 years back. Considering the age and incomplete root development of the patient regenerative endodontics was performed and PRP and MTA were used to induce root end completion. After 8 months, the tooth was asymptomatic clinically and radiographically, roots continued to develop and the periapical radiolucency showed signs of healing. Considering the continued root development and resolution of the periapical radiolucency it can be concluded that regenerative endodontics is an appropriate treatment method in treating an immature permanent necrotic tooth.