The Bone window technique provides excellent access to the surgical site while preserving cortical bone in cases of tooth with large periapical lesion and an intact cortical plate. Traditionally, rotary burs and a bone chisel were used to create a bone window. Piezoelectric bone surgery, on the other hand, is an innovative technique that uses thin osteotomy instrument to selectively cut hard tissue while preserving soft tissues. To the best of our knowledge, no study comparing the results of a bone lid using a piezoelectric device and a conventional bur is currently available.