Inclusion Criteria:  Adult patients ranging from 18 to 45 years with no gender predilection agreed to come for minimum follow-up visits for 6 months. Adequate bone beyond teeth apices without jeopardizing any anatomical structure. Single rooted mandibular teeth with chronic inflammatory periapical lesions represented as periapical radiolucency, pulp necrosis, sinus tract, failed RCT.  Exclusion Criteria:  Smokers and alcoholics. Medically compromised patients having uncontrolled diabetes or coagulation disorders. Restorable teeth. Periodontitis.