An immature, fratured #8 with open apex and large periradicular radiolucency in a 11 year old boy. Periapical radiographs included showing showing: (a) Periapical radiolucent lesion with open apex. (b) Following the placement of MTA (c) At 3 months follow-up, partial regression of periapical radiolucent lesion and partial closure of the root end (d) At 6 months follow-up, with marked reduction in periapical lesion with contiuned development of the root (e) At 9 months follow-up, nearly complete healing of periapical lesion with contiuned development of the root apex (f) At one year follow-up, complete maturation of the root apex with hard tissue bridge formation noted mid root.