Skeletal relapse after mandibular advancement and setback in single-jaw surgery

摘要: Purpose The aim of this study was to identify contributing factors skeletal relapse by analyzing cephalometric changes after bilateral sagittal split ramus osteotomy. Patients and methods This included 60 consecutive patients who underwent either mandibular advancement (30 patients) or setback surgery patients). There were 36 women 24 men (mean age, 23 years). radiographs these taken immediately before operation, at 1 week, 14 months postoperatively studied. To analyze the influence hyper- hypodivergent facial patterns on surgical outcome, divided into 3 groups according mandibulo-nasal plane angle. position maxilla also account. Results Measured B-point, 1.3 mm (30%) mean 4.4 0.8 (12%) 6.0 mm. magnitude movement correlated with relapse. However, correlation not linear. Advancement greater than 7 is associated an increased tendency (r = 0.52), but more 12 a decreased −0.95). retrognathic high angle (hyperdivergence) had 30% higher rate. less in both surgery. Conclusion Skeletal affected different angle; however, influences between setback.