Condylar Position Changes and TMJ Functions After BSSO Mandibular Setback, Low Medial Cut.

This study hypotheses that using low medial cut osteotomy BSSO in mandibular setback can be an efficient and effective method to limit the bony segment interferences , decreasing muscles stripping during osteotomy ,decrease condylar torque and so securing preoperative condylar position during BSSO in comparison with using high medial cut BSSO.

Inclusion criteria:Age of the patient between (18-60) yearsPatients in need of mandibular setback using bilateral sagittal split osteotomy.All patients are free from any systemic disease that may affect normal bone healing.Patient with facial deformity will be treated with mandibular setback either mono or bimaxilary surgeriesPatient with facial deformity will be treated with mandibular setback either surgery first approach or orthofirst approach.Sufficient dentition to reproduce the occlusal relationshipsPatient's consent to participateExclusion criteria:Patients with any systemic disease that may affect normal healingIntra-bony lesions or infections that may interfere with surgery.Previous orthognathic surgeries.Patients with all types of facial clefts