Outcome of Bone Window Approach in Endodontic Microsurgery Using Novel Piezoelectric Device

Inclusion Criteria: * • Consenting adults (age range: 18-60 years) * Non-contributory medical history (ASA Class I or Class 2) * Participants with symptomatic/persistent apical periodontitis showing clinical signs and symptoms and evidence of periapical lesion of strictly endodontic origin with minimum lesion diameter of 5mm on periapical radiography (PR). * Radiographic evidence of an intact buccal cortical plate on cone-beam computed tomographic (CBCT) imaging with minimum thickness of 1mm. Exclusion Criteria: * Patients with systemic diseases (diabetes mellitus, uncontrolled hypertension, hepatic/renal disease, or systemic bleeding disorders), pregnancy, smoking * Patients on anticoagulant/ antiplatelet drugs * Teeth that were unrestorable, fractured/perforated teeth, * Teeth with endodontic-periodontal communication and * Teeth with deep pockets (probing depth \>4 mm)