Schwestka R, Engelke D, Kubein-Meesenburg D, Luhr H G
Georg-August-University, Gottingen, West Germany.
Int J Adult Orthodon Orthognath Surg. 1990;5(2):133-6.
The Le Fort I osteotomy can be used to change the position of the maxilla in all three dimensions. A presurgically fabricated occlusal splint is used to reproduce the planned sagittal and transverse position of the maxilla. Various methods for determining the proper vertical position have been described. The major difficulty in vertical control when these techniques are used is the sagittal change of the lower reference point as the maxilla is advanced. The relative error in the vertical plane increases with larger sagittal movements. The sandwich splint technique, with two stable intraoral reference points, can be used to ensure proper vertical positioning of the maxilla. This method enables exact measurement of the vertical dimension during cast surgery and in the operating room. Vertical measurements are based on the relationship between the mandible and skull base. This distance remains constant during splint fabrication and when the splint is used at surgery. Postoperatively, the mandible can be rotated into the new centric occlusion.
勒福Ⅰ型截骨术可用于在三维空间中改变上颌骨的位置。术前制作的咬合板用于重现上颌骨计划的矢状位和横向位置。已经描述了多种确定合适垂直位置的方法。使用这些技术时，垂直控制的主要困难在于随着上颌骨前移，下方参考点的矢状位变化。矢状位移动越大，垂直平面内的相对误差就越大。具有两个稳定口腔内参考点的三明治咬合板技术可用于确保上颌骨的正确垂直定位。该方法能够在模型手术期间和手术室中精确测量垂直维度。垂直测量基于下颌骨与颅底之间的关系。在制作咬合板期间以及手术中使用咬合板时，这个距离保持不变。术后，下颌骨可旋转至新的正中咬合位。
