Margin line detection
Detecting the margin line
The first step in the construction is the preparation margin detection. In most cases, the wizard will prompt you to click on the margin line for a specific tooth [2].
See Keyboard shortcuts design module for the available specific margin line detection keyboard shortcuts.
As you move the mouse over the scan data, a bubble will appear to show you a sectional 2D view of the area below the mouse pointer. This helps you to find the ideal position of the start point for the automatic margin line detection. For crowns and related restorations, a single click will typically suffice. The automatic margin line detection will start after the first click.
Adjusting the light source to help you see the margin
Rotate the object to look at it from the insertion axis, and then click Adjust Light [6] to adjust the virtual light source, so that it comes from this view point. If you look at the margin from the side afterwards, the shadows will help you see the margin.
Dealing with misdetected margin lines
In some cases, especially when working with non-optimal preparations, the margin line may not be detected correctly. Help the algorithms by clicking on one or more additional points on the margin line by clicking Add point [3]. On the example above, the user has set an additional point (the pink dot) after the initial misdetection. After each point is set, the automatic detection will take advantage of the additional points.
Tip
Typically, adding a single point will be enough. In difficult cases two to four points may be required. Setting large amounts of points is unnecessary.
If you have accidentally clicked on a point which is not actually on the margin, switch to Remove point [4] and click on points to remove them. Switch back by clicking Add point [3].
Clearing and starting over
If you have clicked on the wrong tooth, or outside of the margin, click Clear [7] to start over.
Editing the margin line
Edit or manually draw the margin line by clicking the Correct/draw [1] tab in the Margin Line Detection dialog. The detected margin line changes to green and features little dots, which get bigger as the mouse approaches them. These are the control points that help you edit the margin.
Different modes for editing the margin line are available:
Move [2]: Drag and drop individual control points.
Add new points by clicking on the green line.
Remove points by clicking them with both mouse buttons (first hold the left mouse button on a point and, while holding it, click the right mouse button).
Up/Down [3]: Drag the mouse near the margin. Control points will move up or down, as if the mouse pointer was magnetic.
Draw [4]: Draw a portion – or the entire margin – freely. If a margin has been previously set, start drawing close to the existing margin, and add points by clicking on the object.
Move margin up or down [5]: Enter a value in the preceding box or use the slider to determine the distance by which the whole margin will be moved. Then click 
or 
.
To undo all the changes, click Clear [6].
If you are working with sectioned models, check the Auto-hide adjacents [7] to enable or disable the adjacent die.
No matter how you are editing the margin line, you can always go back one or more steps by clicking Undo/Redo [8]. When done with the margin line editing, click Next to continue to the next step.
Tip
Use the [PageUp] and [PageDown] keys to rotate, in order to inspect the margin line from all sides.