Osteotomy Clinical Trials

Active_comparator: Preoperative Maxillary Block

After the intubation, the block procedure will be performed under ultrasound guidance using an infrazygomatic approach to access the pterygopalatine fossa. Prior to the procedure, the cheek region will be prepared in accordance with aseptic conditions. A linear ultrasound probe will be positioned over the infrazygomatic area to visualize the maxillary tuberosity, lateral pterygoid plate, coronoid process, and mandibular condyle. The following image optimization using the jaw-opening maneuver, the maxillary artery will be identified as an anatomical landmark, and a 50-mm block needle will be advanced into the pterygopalatine fossa using an in-plane technique. After confirmation of negative aspiration, a total of 4 mL of local anesthetic solution consisting of 2 mL of 0.5% bupivacaine and 2 mL of 2% lidocaine (Aritmal) will be injected on each side. The same procedure will subsequently be repeated contralaterally.

Active_comparator: Postoperative Maxillary Block

At the end of the surgery, before the extubation, the block procedure will be performed under ultrasound guidance using an infrazygomatic approach to access the pterygopalatine fossa. Prior to the procedure, the cheek region will be prepared in accordance with aseptic conditions. A linear ultrasound probe will be positioned over the infrazygomatic area to visualize the maxillary tuberosity, lateral pterygoid plate, coronoid process, and mandibular condyle. The following image optimization using the jaw-opening maneuver, the maxillary artery will be identified as an anatomical landmark, and a 50-mm block needle will be advanced into the pterygopalatine fossa using an in-plane technique. After confirmation of negative aspiration, a total of 4 mL of local anesthetic solution consisting of 2 mL of 0.5% bupivacaine and 2 mL of 2% lidocaine (Aritmal) will be injected on each side. The same procedure will subsequently be repeated contralaterally.