Two-thirds anteroposterior ramus length is the preferred osteotomy point for intraoral vertical ramus osteotomy

ConclusionsThe position at two-thirds EOR-PBR length (anteroposterior diameter of the ramus) can serve as a reference distance for the IVRO osteotomy position.Clinical relevanceMandibular setback operations for treating mandibular prognathism mainly include sagittal split ramus osteotomy (SSRO) and IVRO. IVRO has a markedly lower incidence of postoperative lower lip paraesthesia than SSRO. Our design presented a reference point for identification during IVRO, to prevent damage to the inferior alveolar neurovascular bundle.
Source: Clinical Oral Investigations - Category: Dentistry Source Type: research