Figure 9

With a modified parallelometer perpendicular and horizontal lines (ML1-ML8) could be traced on the mounted plaster models. The horizontal marker lines are drawn in their individual heights obtained from the cephalometric analysis. The vertical marker lines are oriented according to the dental landmarks on the plaster model. Alternatively to the parallelometer this orientation can be found with a simple ruler (triangle), with little compromise in accuracy and more time consuming. After model surgery the lines in the new position (postoperative) have to be drawn, to get the 3D skeletal displacement.