Abstract
To evaluate the surgical relapse of mandibular setback, related to the magnitude of setback and LeFort I osteotomy under rotational control of the proximal segment. Data from 78 patients who had undergone sagittal split ramus osteotomy for mandibular prognathism were reviewed. The stability of the proximal segment was retrospectively confirmed. Serial cephalograms were used to assess relapse over 1year. The association between relapse and LeFort I osteotomy as well as the magnitude of setback was assessed. Minimal counterclockwise rotation was noted postoperatively, but the proximal segment remained stable for 1year. Notable forward relapse was shown in the setback of more than 7mm (P<.01) with resumption of function after 6weeks, but it was not related with LeFort I osteotomy. Relapse was related to the amount of setback and occurred on resumption of function despite rotational control of the proximal segment.
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