The purpose of this study was to compare the dentoalveolar changes produced when using two different intraoperative surgical procedures for maxillary distraction osteogenesis. Eight patients were assigned into two gro...The purpose of this study was to compare the dentoalveolar changes produced when using two different intraoperative surgical procedures for maxillary distraction osteogenesis. Eight patients were assigned into two groups according to the surgical procedure: down-fracture (DF, n = 6) vs non-down-fracture (NDF, n = 2). Lateral cephalograms and 3-D models before and after maxillary distraction were analyzed. The Mann-Whitney U test was used to compare the differences in the amounts of advancement and dento-alveolar changes between the DF and NDF groups. The significance level was established at 0.05. Although a significantly greater amount of maxillary movement was observed in the DF group (10.0 mm ± 2.2) than in the NDF group (5.9 mm ± 2.3), significantly greater arch length (8.7 mm ± 5.2) and arch width changes (6.0 mm ± 1.0) were observed in the NDF group than in the DF group, (arch lengths 3.0 mm ± 1.1 and arch width changes 3.2 mm ± 2.0). A significantly greater amount of dental anchorage loss was observed in the NDF group. The use of the NDF procedure resulted in greater amounts of dental anchorage loss than resulted from the DF procedures when tooth-borne devices were used during maxillary distraction osteogenesis. The type of surgical procedure might play an important role in the amount and direction of the dental changes.展开更多
目的观察中面部牵引成骨技术对眼眶周围软、硬组织结构的三维空间位置变化的影响。方法回顾性分析2003年9月至2006年6月接受LeFortⅢ型截骨＋中面部牵引成骨术的8例Crouzon综合征患者CT数据，平均年龄11．9岁，实施影像三维重建后，采...目的观察中面部牵引成骨技术对眼眶周围软、硬组织结构的三维空间位置变化的影响。方法回顾性分析2003年9月至2006年6月接受LeFortⅢ型截骨＋中面部牵引成骨术的8例Crouzon综合征患者CT数据，平均年龄11．9岁，实施影像三维重建后，采用眶耳平面（术前）作为测量的基准平面，分别选择眶上点、眶下点、眶内缘点、眶外缘点、眼球前点、眼球后点，以及上、下、内、外四直肌与眼球的附着点作为评估标志，以双侧耳门上点连线作为颅底宽度基准，记录各个主要标志点至耳门上点连线的矢状距（Y轴向）、垂直距（Z轴向）以及眼球前点、眼球后点的水平间距（Z轴向）变化，行配对t检验，并与健康对照组比较。结果牵引成骨术前后眼球前点的Y轴向及Z轴向位置并没有显著性变化，但X轴向间距变化为一3．40mm；眶下点移动在Y轴向平均12．24mm，Z轴向平均4．25mm；眶内缘点移动在Y轴向平均10．11mm，Z轴向平均2．80mm；眶外缘点移动在Y轴向平均9．86mm，Z轴向平均2．31mm；下直肌支点移动，Y轴向平均3．63mm，z轴向平均2．98mm。其余各标记点未见有临床意义的位移变化。结论以Le Fort Ⅲ型截骨为主的面中部牵引成骨技术，可以使Crouzon综合征患者的术后眼眶内、外、下侧壁均出现明显的前、下方移位，而患者的眼球没有显著性的矢状向位置变化，仅呈现轻度的内移、下降和前上方旋转。展开更多
文摘The purpose of this study was to compare the dentoalveolar changes produced when using two different intraoperative surgical procedures for maxillary distraction osteogenesis. Eight patients were assigned into two groups according to the surgical procedure: down-fracture (DF, n = 6) vs non-down-fracture (NDF, n = 2). Lateral cephalograms and 3-D models before and after maxillary distraction were analyzed. The Mann-Whitney U test was used to compare the differences in the amounts of advancement and dento-alveolar changes between the DF and NDF groups. The significance level was established at 0.05. Although a significantly greater amount of maxillary movement was observed in the DF group (10.0 mm ± 2.2) than in the NDF group (5.9 mm ± 2.3), significantly greater arch length (8.7 mm ± 5.2) and arch width changes (6.0 mm ± 1.0) were observed in the NDF group than in the DF group, (arch lengths 3.0 mm ± 1.1 and arch width changes 3.2 mm ± 2.0). A significantly greater amount of dental anchorage loss was observed in the NDF group. The use of the NDF procedure resulted in greater amounts of dental anchorage loss than resulted from the DF procedures when tooth-borne devices were used during maxillary distraction osteogenesis. The type of surgical procedure might play an important role in the amount and direction of the dental changes.
文摘目的观察中面部牵引成骨技术对眼眶周围软、硬组织结构的三维空间位置变化的影响。方法回顾性分析2003年9月至2006年6月接受LeFortⅢ型截骨＋中面部牵引成骨术的8例Crouzon综合征患者CT数据，平均年龄11．9岁，实施影像三维重建后，采用眶耳平面（术前）作为测量的基准平面，分别选择眶上点、眶下点、眶内缘点、眶外缘点、眼球前点、眼球后点，以及上、下、内、外四直肌与眼球的附着点作为评估标志，以双侧耳门上点连线作为颅底宽度基准，记录各个主要标志点至耳门上点连线的矢状距（Y轴向）、垂直距（Z轴向）以及眼球前点、眼球后点的水平间距（Z轴向）变化，行配对t检验，并与健康对照组比较。结果牵引成骨术前后眼球前点的Y轴向及Z轴向位置并没有显著性变化，但X轴向间距变化为一3．40mm；眶下点移动在Y轴向平均12．24mm，Z轴向平均4．25mm；眶内缘点移动在Y轴向平均10．11mm，Z轴向平均2．80mm；眶外缘点移动在Y轴向平均9．86mm，Z轴向平均2．31mm；下直肌支点移动，Y轴向平均3．63mm，z轴向平均2．98mm。其余各标记点未见有临床意义的位移变化。结论以Le Fort Ⅲ型截骨为主的面中部牵引成骨技术，可以使Crouzon综合征患者的术后眼眶内、外、下侧壁均出现明显的前、下方移位，而患者的眼球没有显著性的矢状向位置变化，仅呈现轻度的内移、下降和前上方旋转。
