Adolescent 1 Adult 1 Analgesics 1 Antiemetics 1 Article 1 Clonidine 1 Double-Blind Method 1 Female 1 Humans 1 Le Fort I osteotomy 1 Male 1 Ondansetron 1 Orthognathic Surgical Procedures 1 Pain, Postoperative 1 Postoperative Nausea and Vomiting 1 Postoperative nausea and vomiting Treatment Outcome 1 Young Adult 1 adolescent 1 adult 1 analgesia 1 analgesic agent 1 anesthetic recovery 1 antibiotic therapy 1 antiemetic agent 1 atracurium besilate 1 atropine 1 body mass 1 capnometry 1 cefazolin 1