IntroductionMandibular distraction osteogenesis. a recommended therapy for hemifacial microsomia. has brought much agony because of its traumatic procedures and peri-osteotomy complications. Our study aims to retrospectively compare piezoelectric osteotome with conventional reciprocal bone saw for hemifacial microsomia patients and validate its meliority in operability. https://www.nacrack.com/quick-grab-Chainsaw-File-super-grab/