Fig. 4

Periapical radiographs during treatment and follow-up periods. (a) preoperative, (b) after initial treatment with calcium hydroxide paste, (c) postoperative after mineral trioxide aggregate filling, and at (d) l-year, (e) 1.5-year, and (f) 2-year recall. There is radiographic evidence of apex closure of the main root canal and root development of the tooth