Provisional dentures

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Drawing the margin line

The first step is to define the margin for all teeth marked as provisional crown or provisional pontic. Start drawing the margin line by clicking on the scan where the margin line of the future preparation should be. Click to add new points. You can still move existing points by dragging and dropping.

WarningDo not go up to the interdental contact areas. You can draw the margin line "through" the scan, by setting one control point on the vestibular side, and the next one on the lingual side.
RIGHT WRONG
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TipSet the scan data visualization to transparent to get a better view of the entire margin


After clicking “Apply Margin” you can still move the points, but this will change the shape of the tooth. You can click “Apply Margin” again to re-adapt the shape to the existing tooth.

TipTry to make sure that the margin is not placed under the adjacent tooth, otherwise the provisional tooth will be too large to fit. Also, margin lines of adjacent teeth should not intersect each other. Look at the margin lines from below to check for intersections.





Manual correction of the tooth boundary detection

The software will detect automatically the shape of the tooth that belongs to the margin you drew. If the detection is not correct, (e.g some parts are missing from the tooth, or parts that belong to the adjacent tooth are included) you can correct it manually.

Areas belonging to the tooth should be yellow, areas belonging to adjacent or gingiva should be grey.

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Freeforming

When working on broken dentition, reshape the tooth approximately into the desired shape, because the crown bottom will be created from this form.

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Adjust the shape of the teeth as described under Freeforming

TipProvisional pontics can be moved by dragging their lower part with the mouse (see area marked by the star in the screen shot below).
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Provisional crown bottoms

The next step is to design the inside of the provisional (the virtual preparation).

TipTo get a view of the generated crown bottoms, set “Full Anatomy” to transparent in the "Show/Hide groups" window
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A number of parameters can be adjusted that affect the shape of the crown bottom.

Shoulder Width [A]: This defines the width of the shoulder preparation

Shoulder Slope[B]: This defines the angulation of the shoulder.

Taper[C]: This defines the angulation of the axial walls of the preparation





Setting insertion axis

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To change the insertion axis, drag and drop the ball [4] above to the insertion axis indicator (yellow arrow). If the check box 'Unique insertion direction for jaw' [1] is checked, then the change will be applied to all teeth; if it is unchecked, you can change insertion axis individually.

When finished adjusting the parameters, click 'Update Crown Bottoms' [2] to apply the changes.





Choosing the next step

By default, the provisional crown shape will be derived from the original tooth shape in the scan data. In case of heavily damaged dentition, it may be better to design the provisional using library teeth instead. The mode of operation can be selected under 'Next step' [3]:

  • Choose 'Design without tooth library' (default) to use original tooth shape for crowns
  • Choose 'Design crown using tooth library'. If you select this option, the wizard will automatically copy the existing tooth and use it as a pre-op scan.


When done, click 'Next'. The wizard will guide you through the remaining steps, which are well known to you from 'normal' crown and bridge designs.