Guided cutting of bone for intraoral vertical ramus osteotomy with a freer marking technique

Abstract

ntraoral vertical ramus osteotomy (IVRO) is useful in the reatment of mandibular prognathism, its advantages being hat it is faster and simpler than sagittal split ramus osteotomy s it requires only a single cutting line.1 Although IVRO is done through a single simple steotomy, arterial and neurological injuries may be caused if his is made in the wrong place. The antilingular eminence is he main reference structure for IVRO, because it is often corelated with the position of the lingula as the point of entrance f the mandibular neurovascular bundle into the mandible.2 he line to cut the bone for an IVRO can be routinely set just ehind the antilingular eminence. However, the antilingular eminence is not prominent in ome cases and it is not always related to the point of entrance f the mandibular nerve. It can be anatomically defined s a bony protuberance that is attached to the masseteric usculature.3 We have therefore developed a technique to