Following the randomization procedure, patients will be divided into 2 groups (12 immature molars in each group): Group I will be treated with MTA as apical plug, whereas group II will be treated with Biodentine as apical plug. After working length determination, instrumentation and sterilizing root canals, apical plug will be done as following: Biodentine Group: Biodentine will be placed into the apical portion of canals. After 12 min the coronal and middle third of the root canal will be filled with gutta-percha and AH Plus. The coronal restoration will be completed with GIC, composite, and stainless-steel crown. MTA Group: MTA will be placed into the apical portion of canals, then a moist cotton pellet will be placed and the access cavity will be restored with temporary filling. Next day, temporary filling and the cotton pellet will be removed, then the coronal restoration will be performed as Biodentine group. Patients of both groups will be recalled for clinical and radiographical follow-up within 12 months after treatment.
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Change in the apical lesion size
Timeframe: after 1,3,6 and 12 months of root canal obturation
Change in the clinical assessment of success
Timeframe: 1 day, 3 days, 1 week, 2 weeks, 1 month, 3 months, 6 months and 12 months of root canal obturation