Abstract

Intraoral vertical ramus osteotomy (IVRO) is a surgical procedure that can be used to move the distal segment of the mandible posteriorly for the treatment of mandibular prognathism. The mesial segment overlaps with distal segment laterally and goes through a healing process while cortical-to-cortical contact. Compared to sagittal split ramus osteotomy (SSRO), IVRO has the following advantages: the surgical procedure is simple, so there is a low possibility of unexpected fractures; the surgical time is short relatively; the possibility of inferior alveolar nerve damage is low; it has positive effect in treatment temporomandibular joint disease through the condylotomy ef- fect; and the anteroposterior stability is relatively favorable. (J Korean Dent Assoc 2025; 63(6): 207-215)