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Abstract：
BACKGROUND: This study was conceived to assess the postoperative stability of condylar position following fixation with miniplates and lag screws after bilateral sagittal split osteotomy (BSSO).
METHODS: This retrospective study included a cohort of 20 patients undergoing BSSO using the Obwegeser-Dal Pont modification. The bony segments were stabilized using either miniplates with two 2.0-mm monocortical screws per segment or three 2.0-mm bicortical lag screws along the mandible\'s superior border. Pre- and postoperative (7-day interval) spiral computed tomography scans were conducted to assess skeletal changes across both groups. Data analysis employed Wilcoxon signed-rank and Wilcoxon rank-sum tests (α = 0.05).
RESULTS: No statistically significant difference was observed between the pre-and postoperative condylar position parameters (P>0.05). However, the lag screw group showed a marginal significant increase in the left condyle\'s angulation (preoperative: 24.83 ± 6.37 vs. postoperative: 32.5 ± 4.93; P = 0.04). Changes in condylar height, length, and width were not statistically significant before and after BSSO in either groups (P>0.05). Nor was any statistically significant difference found between the miniplates and lag screws groups regarding condylar position parameters (P>0.05).
CONCLUSIONS: The results indicated that both lag screw and miniplate fixation methods can be effectively employed in BSSO procedures without impacting condylar position parameters. Thus, either fixation method can be chosen depending on factors such as the surgeon\'s preference and clinical outcomes.
METHODS: This retrospective study included a cohort of 20 patients undergoing BSSO using the Obwegeser-Dal Pont modification. The bony segments were stabilized using either miniplates with two 2.0-mm monocortical screws per segment or three 2.0-mm bicortical lag screws along the mandible\'s superior border. Pre- and postoperative (7-day interval) spiral computed tomography scans were conducted to assess skeletal changes across both groups. Data analysis employed Wilcoxon signed-rank and Wilcoxon rank-sum tests (α = 0.05).
RESULTS: No statistically significant difference was observed between the pre-and postoperative condylar position parameters (P>0.05). However, the lag screw group showed a marginal significant increase in the left condyle\'s angulation (preoperative: 24.83 ± 6.37 vs. postoperative: 32.5 ± 4.93; P = 0.04). Changes in condylar height, length, and width were not statistically significant before and after BSSO in either groups (P>0.05). Nor was any statistically significant difference found between the miniplates and lag screws groups regarding condylar position parameters (P>0.05).
CONCLUSIONS: The results indicated that both lag screw and miniplate fixation methods can be effectively employed in BSSO procedures without impacting condylar position parameters. Thus, either fixation method can be chosen depending on factors such as the surgeon\'s preference and clinical outcomes.
摘要：
背景：本研究旨在评估双侧矢状位劈开截骨术（BSSO）后微型钢板和方头螺钉固定后髁突位置的术后稳定性。
方法：这项回顾性研究纳入了20例接受BSSO的患者队列，使用Obwegeser-DalPont改进。使用每段带有两个2.0毫米单皮质螺钉的微型板或沿下颌骨上边界的三个2.0毫米双皮质方头螺钉来稳定骨段。术前和术后（间隔7天）进行螺旋计算机断层扫描以评估两组的骨骼变化。数据分析采用Wilcoxon符号秩和Wilcoxon秩和检验(α=0.05)。
结果：术前与术后髁突位置参数无统计学差异（P>0.05）。然而,拉力螺钉组显示左髁角度的边缘显着增加（术前：24.83±6.37vs.术后：32.5±4.93；P=0.04）。髁突高度的变化,长度,两组BSSO前后宽度和宽度均无统计学意义(P>0.05)。在髁突位置参数方面，微型板和拉力螺钉组之间也没有发现任何统计学上的显着差异（P>0.05）。
结论：结果表明，方头螺钉和微型钢板固定方法均可有效用于BSSO手术，而不会影响髁突位置参数。因此，两种固定方法均可根据外科医生的偏好和临床结果等因素进行选择。
方法：这项回顾性研究纳入了20例接受BSSO的患者队列，使用Obwegeser-DalPont改进。使用每段带有两个2.0毫米单皮质螺钉的微型板或沿下颌骨上边界的三个2.0毫米双皮质方头螺钉来稳定骨段。术前和术后（间隔7天）进行螺旋计算机断层扫描以评估两组的骨骼变化。数据分析采用Wilcoxon符号秩和Wilcoxon秩和检验(α=0.05)。
结果：术前与术后髁突位置参数无统计学差异（P>0.05）。然而,拉力螺钉组显示左髁角度的边缘显着增加（术前：24.83±6.37vs.术后：32.5±4.93；P=0.04）。髁突高度的变化,长度,两组BSSO前后宽度和宽度均无统计学意义(P>0.05)。在髁突位置参数方面，微型板和拉力螺钉组之间也没有发现任何统计学上的显着差异（P>0.05）。
结论：结果表明，方头螺钉和微型钢板固定方法均可有效用于BSSO手术，而不会影响髁突位置参数。因此，两种固定方法均可根据外科医生的偏好和临床结果等因素进行选择。
