Inclusion Criteria:  Patients in need of bilateral sagittal split osteotomy for mandibular repositioning. All patients are free from any systemic disease that may affect normal bone healing. Sufficient dentition to reproduce the occlusal relationships Patient's consent to participate  Exclusion Criteria:  Patients with any systemic disease that may affect normal healing Intra-bony lesions or infections that may interfere with surgery. Previous orthognathic surgeries.