Schwestka R, Engelke D, Zimmer B, Kubein-Meesenburg D
Department of Orthodontics, University Hospital of Goettingen, West Germany.
Eur J Orthod. 1991 Oct;13(5):367-71. doi: 10.1093/ejo/13.5.367.
In orthognathic surgery a three-dimensional positioning of the maxilla is possible by means of the Le Fort I osteotomy and subsequent maxillary movement. In treatment planning and at the time of surgery it is very important to achieve an exact positioning of the upper incisors in relation to the upper lip and the rest of the skull. The Model Positioning Device described here allows three-dimensional positioning of the upper incisors in one- or two-jaw surgery. The reference plane is the upper surface of the upper part of a semi-individually adjustable articulator. The application of the Sandwich Splint enables the three-dimensional positioning of the maxilla in relation to the rest of the skull. The Sandwich Splint ensures that the vertical position of the mandible in relation to the rest of the skull above the osteotomy plane is exactly reproducible in the pre- and post-operative situation in both model surgery and at time of surgery. To this mandibular position the maxilla is positioned in three dimensions, as preplanned. The vertical dimension, which is identically reproducible before and after surgery is measured with a caliper. After surgery the mandible can be rotated into the planned new intercuspidation.
在正颌外科手术中，通过勒福Ⅰ型截骨术及随后的上颌骨移动，可以实现上颌骨的三维定位。在治疗计划制定和手术过程中，使上颌切牙相对于上唇及颅骨其他部分实现精确的定位非常重要。这里描述的模型定位装置可在单颌或双颌手术中对上颌切牙进行三维定位。参考平面是半个体化可调牙合架上部的上表面。三明治夹板的应用能够使上颌骨相对于颅骨其他部分进行三维定位。三明治夹板确保在模型手术及手术时，截骨平面上方下颌骨相对于颅骨其他部分的垂直位置在术前和术后情况中都能精确再现。上颌骨按照预先规划，相对于此下颌位置进行三维定位。垂直维度通过卡尺测量，手术前后可精确再现。术后下颌骨可旋转至计划的新牙尖交错位。
