Clinical trials

Bimaxillary osteotomy is a surgery procedure of the orthognathic surgery field for correction of dental and facial abnormalities, for both functional and aesthetic cases. The incidence of this abnormality is 5-10% of the population, and the etiology is unknown, with genetic, environmental and embryonic factors related. The surgery technic is complex, and requires osteotomy of the maxilla and jaw, which allows toward, forward, impact and rotation of these bones to fix the edges of the face. The anesthetic management of these patients is a challenge because of the difficult airway management and the perioperative pain control. Multimodal approach for pain control is a fact, and the use of local and regional anaesthesia is mandatory. The investigators propose bilateral ultrasound-guided suprazigomatic maxillary nerve block after bimaxillary osteotomy for a proper control of postoperative pain.

Ultrasound-guided maxillary nerve block is mandatory for perioperative pain management of surgeries involving the middle third of the face. The suprazygomatic approach to the maxillary nerve has proven to be the safest and most effective. The volume used for maxillary nerve block remains a matter of debate; and this study aims to compare and study the dispersion of 2 - 5ml injected into the ptergopalatine fossa, and to know the reach of the mandibular nerve with this block.