Sagittal Split
To virtually perform a sagittal split osteotomy:
Click Sagittal Split 
on the Surgery tab.
Click the 3D viewer on the left or right side of the mandible, depending on where to simulate the sagittal split osteotomy.
Only half of the mandible is visualized in the scene for better visibility and it rotates to the correct orientation. If a dental segmentation has been performed, the segmented teeth are visible in the 3D viewer. If the mandibular nerve has been annotated, it is also shown in the 3D viewer. Indicate two points to construct the lingual osteotomy line as shown in the instruction panel on the left. If you want to replace the points, click Reindicate cutting line.
When done, click Next.
The bone model rotates to a lateral view for a correct orientation. Indicate two points to construct the buccal osteotomy line. If you want to replace the points, click Reindicate cutting line.
When done, click Next.
The model is rotated to the frontal view. The osteotomy plane is constructed. Rotate the model to check the osteotomy plane. Ensure it completely intersects the mandible model. If necessary, adjust it by clicking and dragging the blue points.
Then click Next.
The model is cut. The mandible and the ramus are added to the visibility editor. The ramus is highlighted in blue. Check whether the osteotomy was simulated correctly and whether the mandible and the ramus fragments are correctly identified. If not, click Back and resolve the issue. If the osteotomy was simulated correctly, click Finish.
Depending on the executed sagittal split osteotomy, the right or the left ramus is added to the scene, and to the surgery models group in the Patient Visibility smart panel. The objects are colored in green. Change the bone fragment properties by right-clicking on the fragment in the 3D scene.