Inclusion Criteria:  The cooperation of the child and parents, during treatment plain, and the commitment to attend the follow-up appointments. Parents signed the consent to participate in the study. Absence of any systemic disease, which would contraindicate pulp therapy. Child didn't have any history of sensitive reaction to any component of used materials. Present half to two third of tooth root or more Root with signs or symptoms of infected necrotic pulp or chronic abscess, with or without sinus tract, soft tissue swelling, mobility or tenderness to percussion and internal or external root resorption or unsuccessful past pulp treatment.  Exclusion Criteria:  All that does not correspond to هnclusion ؤriteria: