Surgery Orthognathic Surgery all are true except A Advances pushes back or changes the vertical positions of the mandible and/or maxilla. B Using the sagittal split mandibular osteotomy is restricted to the treatment of mandibular retrognathia. C May significantly improve the psychological well being of the patient. D Employing autologous bone grafts prolongs the hospitalisation of the patient. 💡 Explanation Orthognathic Surgery all are true except ✓ Correct Answer: B. Using the sagittal split mandibular osteotomy is restricted to the treatment of mandibular retrognathia.