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The International Journal of Adult Orthodontics & Orthogathic Surgery
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International Journal of Adult Orthodontics and Orthognathic Surgery

Year 1995
Volume 10 , Issue 3

Pages: 181 - 192

Stability of sagittal split advancement osteotomy: Single- versus double-jaw surgery


The effect of Le Fort I maxillary impaction on the stability of the sagittal split advancement osteotomy is debatabel. The aim of this study was to compare the stability of mandibular advancements in two groups of patients: those that had simultaneous Le Fort I maxillary impaction and sagittal split advancement osteotomy and those that had only sagittal split advancement osteotomy. Lateral cephalograms taken immediately after surgery, 6 months postoperatively, and at 1-year follow-up were used in the assessment. In addition to routine cephalometric analysis, the Euclidean Distance Matrix method was also used . The magnitude of mandibular relapse was similar in both groups in the form of mandibular clockwise rotation and posterior settling. The mandible rotaede by 2.2 degrees in th single-jaw surgery group and 2.5 degrees in the bimaxillary osteotomy group. The mandible settleed posteriorly by 1.0 degree in the single-jaw surgery group and 1.2 degrees in the bimaxillary osteotomy group. The differences were not statistically significant. In all the patients, Le Fort maxillary osteotomy was more stable than was mandibular advancement. The counterclockwise rotation of the distal mandibular segments and the distraction of the condylar segments during surgery were reponsible for mandibular relapse.


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