Fig. 3

Treatment and follow-ups periapical radiographs. A preoperative, B postoperative after the first vitapex filling, C postoperative after the second vitapex filling, D postoperative after iRoot BP plus filling of the main root canal and iRoot SP and warm gutta-percha obturation of the invaginated root canal (#31), and at E 5-month, F 1-year, and G 1.5-year recall. The radiographic image indicates apex closure of the main root canal and root development of the tooth. H Postoperative after iRoot SP and warm gutta-percha obturation of the invaginated root canal (#41)