![]() Group BD (n = 13) comprised of 7 men and 6 women, and the average age of the patients was 27.8 years. Group AD (n = 12) comprised of 4 men and 8 women, and the average age of the patients was 25.8 years. Postoperatively, in Group A, five of the 26 patients (19.2%) had more than 2 mm change at point A in the sagittal direction (hA), as opposed to three of 26 patients (11.5%) in Group B (data not shown).įull size table Variations in cephalometric parameters at each period - comparison of the stability between Group AD and Group BD (cases with occlusal cant correction) Significant differences were observed in the variations of hM, vB, and vM from T1 to T2. Postoperatively, no significant difference was observed in the variations of SNA, SNB, hA, hB, ramus inclination, vA, Gonial angle, MOC, and hMp, throughout the study period. Based on the examined cephalometric parameters (T0 to T1), no significant difference was observed between the two groups in jaw movement after the surgery. Variations in the cephalometric parameters (Table 1) at each period in Group A and Group B are shown in Table 2. Group B (n = 26) comprised of 11 men and 15 women, and the average age of the patients was 24.9 years. Group A (n = 26) comprised of 11 men and 15 women, and the average age of the patients was 24.7 years. Variations in cephalometric parameters at each period - comparison of the stability between Group A and Group B The aim of the current study was to compare the skeletal stability after 1-year follow-up both original Le Fort I osteotomy and maxillary step osteotomy techniques after bimaxillary surgeries performed to correct mandibular prognathism and facial asymmetry. However, under the systems of modern orthognathic surgery, the difference in postoperative stability of Le Fort I osteotomy between linear and step osteotomy techniques remains to be elucidated. In addition, use of locking miniplate system for fixation of the maxilla became possible. ![]() The method of bone fixation changed from wire to rigid fixation because some studies, which have used plates and screws for bone fixation, indicated lower relapse rates 8, 9, 10. During maxillary advancement independent of the osteotomy plane, a decrease in bony contact occurs at the final position and the maxillary segment is thought to be less stable 2. During forward movement of the maxilla along the inclined osteotomy plane, the bony segment is moved in both forward and upward direction. The researchers described that the antero-posteriorly inclined linear osteotomy line of the conventional Le Fort I procedure can affect the stability of the repositioned maxillary segment depending upon the patterns of movement. Maxillary step osteotomy technique, reported by Bennett and Wolford in 1985, is one of the modifications of the Le Fort I osteotomy 7. Right-angled osteotomy lines have been proposed in order to overcome the disadvantages of linear osteotomy lines 2, 3, 4, 5, 6. Reliable long-term results have been achieved, since the first description of the procedure by Wassmund in 1935 1. Le Fort I osteotomy is the most widely used operative procedure to correct midfacial deformities. It may be suggested that there is no significant difference in skeletal stability at 1 year after the two procedures. In conclusion, differences between original Le Fort I osteotomy and maxillary step osteotomy were observed at the frontal points of the mandible however, they were not clinically significant. Differences between the two groups were less in asymmetry cases required correction of the occlusal plane. Lesser degrees of changes were observed after maxillary step osteotomy than after original Le Fort I osteotomy, and the differences were significant during the period between T1 and T2, but not from T1 to T3. Only 3 parameters-vertical and horizontal distance of menton and vertical distance of point B-showed minimal but significant differences between the two groups. ![]() Twelve cephalometric parameters were measured to evaluate postsurgical stability (lesser change was considered as enhanced stability) at 1 month (T1), 6 months (T2), and 1 year (T3) postoperatively. Fifty-two patients with prognathism underwent sagittal split ramus osteotomy with either original Le Fort I osteotomy or maxillary step osteotomy (26 patients each). ![]() The purpose of the current study was to compare the 1-year stability of skeletal after original Le Fort I osteotomy and maxillary step osteotomy.
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