Objective: The intraoral verticosagittal ramus osteotomy (IVSRO) was first described by Choung to correct mandibular prognathism. This osteotomy produces a contact area between the proximal and distal segments allowing a versatility of movements such as mandibular setbacks, advancements and rotations. Although this technique has potential benefits in decreasing neurosensory disturbance and no necessity of rigid fixation, little is known about its stability. The aim of this study was to evaluate the stability of IVSRO in mandibular setbacks.
Materials and methods: In this retrospective study, cephalograms of 40 patients who underwent IVSRO in single-jaw or 2-jaw surgery were analyzed. Horizontal relapse was obtained by tracing cephalograms in 3 different periods of time: preoperative (T0), within 1 month of surgery (T1) and at least 1 year of follow-up (T2). The distance between the B point and a vertical line were accessed between T0 and T1 (amount of setback) and T1 and T2 (relapse). Chi-square test was performed for statistical analyses.
Results: The mean surgical setback was 3.87 mm and the mean horizontal relapse was 0.56 mm after 1 year of follow-up. There was a significant correlation between amount of setback and relapse ( p < 0.05), whereas there was no correlation between gender or age and relapse.
Conclusions: In this sample, IVSRO was a stable technique. Further studies are necessary to confirm these findings.
Conflict of interest: None declared.