It also means that there is a center of trench line for the machine driver to select as an alignment within machine control for more accuracy. If you use the VPI method to elevate your lines youi set the distance along the line for your level, so there are never any overlaps, and it is eaasy to correct if you type in the wrong level at the top/bottom of the step. I found that doing this generally increased my efficiency. The assembly was then reattached to the model and the fluid filtration rate of the smear layer-covered dentin was measured again. For the SiC group, the smear layer was created by manually grinding the dentin surfaces with 600-grit SiC paper for 60 seconds under running water. This cuts out the need to edit the lines along the side of the trench to the correct level and also cuts out the need for breaklines at the top and bottom of the steps. The bur was replaced with a new one after 5 samples were prepared. This automatically makes the software triangulate the top and bottom of the steps straight across the trench as they are VPI points which become automatic triangulation points in surface generation. After I have created the VPIs for the center line I offset it in both directions for 1/2 the width of the final trench. I generally make the steps 2mm as this makes them almost vertical in Machine Control. I used to do that, but now I create a 2D linestring at the center of trench then edit it and use the vertical edit to add VPIs for the steps.
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