PDF(Pubmed)
Abstract：
UNASSIGNED: This study compared sequential changes in skeletal stability and the pharyngeal airway following mandibular setback surgery involving fixation with either a titanium or a bioabsorbable plate and screws.
UNASSIGNED: Twenty-eight patients with mandibular prognathism undergoing bilateral sagittal split osteotomy by titanium or bioabsorbable fixation were randomly selected in this study. Lateral cephalometric analysis was conducted preoperatively and at 1 week, 3-6 months, and 1 year postoperatively. Mandibular stability was assessed by examining horizontal (BX), vertical (BY), and angular measurements including the sella-nasion to point B angle and the mandibular plane angle (MPA). Pharyngeal airway changes were evaluated by analyzing the nasopharynx, uvula-pharynx, tongue-pharynx, and epiglottis-pharynx (EOP) distances. Mandibular and pharyngeal airway changes were examined sequentially. To evaluate postoperative changes within groups, the Wilcoxon signed-rank test was employed, while the Mann-Whitney U test was used for between-group comparisons. Immediate postoperative changes in the airway were correlated to surgical movements using the Spearman rank test.
UNASSIGNED: Significant changes in the MPA were observed in both the titanium and bioabsorbable groups at 3-6 months post-surgery, with significance persisting in the bioabsorbable group at 1 year postoperatively (2.29°±2.28°; P<0.05). The bioabsorbable group also exhibited significant EOP changes (-1.21±1.54 mm; P<0.05) at 3-6 months, which gradually returned to non-significant levels by 1 year postoperatively.
UNASSIGNED: Osteofixation using bioabsorbable plates and screws is comparable to that achieved with titanium in long-term skeletal stability and maintaining pharyngeal airway dimensions. However, a tendency for relapse exists, especially regarding the MPA.
UNASSIGNED: Twenty-eight patients with mandibular prognathism undergoing bilateral sagittal split osteotomy by titanium or bioabsorbable fixation were randomly selected in this study. Lateral cephalometric analysis was conducted preoperatively and at 1 week, 3-6 months, and 1 year postoperatively. Mandibular stability was assessed by examining horizontal (BX), vertical (BY), and angular measurements including the sella-nasion to point B angle and the mandibular plane angle (MPA). Pharyngeal airway changes were evaluated by analyzing the nasopharynx, uvula-pharynx, tongue-pharynx, and epiglottis-pharynx (EOP) distances. Mandibular and pharyngeal airway changes were examined sequentially. To evaluate postoperative changes within groups, the Wilcoxon signed-rank test was employed, while the Mann-Whitney U test was used for between-group comparisons. Immediate postoperative changes in the airway were correlated to surgical movements using the Spearman rank test.
UNASSIGNED: Significant changes in the MPA were observed in both the titanium and bioabsorbable groups at 3-6 months post-surgery, with significance persisting in the bioabsorbable group at 1 year postoperatively (2.29°±2.28°; P<0.05). The bioabsorbable group also exhibited significant EOP changes (-1.21±1.54 mm; P<0.05) at 3-6 months, which gradually returned to non-significant levels by 1 year postoperatively.
UNASSIGNED: Osteofixation using bioabsorbable plates and screws is comparable to that achieved with titanium in long-term skeletal stability and maintaining pharyngeal airway dimensions. However, a tendency for relapse exists, especially regarding the MPA.
摘要：
■本研究比较了下颌骨复位手术后骨骼稳定性和咽气道的顺序变化，该手术涉及用钛或生物可吸收板和螺钉固定。
■本研究随机选择了28例下颌骨前突患者，通过钛或生物可吸收固定术进行双侧矢状劈开截骨术。术前和术后1周进行侧位头颅测量分析，3-6个月,术后1年。下颌稳定性通过检查水平（BX）进行评估，垂直(BY),和角度测量，包括蝶鞍到B点的角度和下颌平面角（MPA）。通过分析鼻咽部评估咽部气道变化，小舌咽部,舌咽,和会厌咽间距离（EOP）。依次检查下颌和咽气道变化。为了评估组内的术后变化，采用Wilcoxon符号秩检验，而Mann-WhitneyU检验用于组间比较。使用Spearman等级检验，术后气道的即时变化与手术运动相关。
■在手术后3-6个月，钛和生物可吸收组均观察到MPA的显着变化，术后1年生物可吸收组有显著性(2.29°±2.28°;P<0.05)。生物可吸收组在3-6个月时也出现明显的EOP变化（-1.21±1.54mm；P<0.05），术后1年逐渐恢复到非显著水平。
■使用生物可吸收板和螺钉的骨固定在长期骨骼稳定性和维持咽部气道尺寸方面与钛的骨固定相当。然而,存在复发的趋势，尤其是MPA。
■本研究随机选择了28例下颌骨前突患者，通过钛或生物可吸收固定术进行双侧矢状劈开截骨术。术前和术后1周进行侧位头颅测量分析，3-6个月,术后1年。下颌稳定性通过检查水平（BX）进行评估，垂直(BY),和角度测量，包括蝶鞍到B点的角度和下颌平面角（MPA）。通过分析鼻咽部评估咽部气道变化，小舌咽部,舌咽,和会厌咽间距离（EOP）。依次检查下颌和咽气道变化。为了评估组内的术后变化，采用Wilcoxon符号秩检验，而Mann-WhitneyU检验用于组间比较。使用Spearman等级检验，术后气道的即时变化与手术运动相关。
■在手术后3-6个月，钛和生物可吸收组均观察到MPA的显着变化，术后1年生物可吸收组有显著性(2.29°±2.28°;P<0.05)。生物可吸收组在3-6个月时也出现明显的EOP变化（-1.21±1.54mm；P<0.05），术后1年逐渐恢复到非显著水平。
■使用生物可吸收板和螺钉的骨固定在长期骨骼稳定性和维持咽部气道尺寸方面与钛的骨固定相当。然而,存在复发的趋势，尤其是MPA。
