Placement of library teeth

Legacy software documentationThis page documents an old version of the exocad software. See documentation for the latest version

The software will load library teeth and place them automatically. In this step, you have the possibility to manually optimize the placement of the model teeth, by moving, rotating, and scaling. Switch between these modes using buttons [1-3]. Then, simply drag and drop the mouse on the teeth to make your adjustments.

TipNote that the tooth models are displayed in yellow – this means that they are responsive to mouse clicks. Whenever objects are displayed in yellow in the viewer, they will react to clicking and/or dragging the mouse.

For crown preparations, don't be overly worried about positioning accuracy at this point – a rough placement will be enough; you can always do fine-tweaking later in the "Freeforming" step. It doesn't matter if the model tooth doesn't properly fit the preparation (see [7] for an example) – as long as the tooth model is positioned somewhat reasonably in relation to the preparation, the software will adapt the library tooth automatically in the next step.

For inlay preparations, accurate positioning is crucial already at this point. The closer you position the model tooth to the prepared tooth, the better the result will be, so it is worth to invest a little time here.

TipA semi-transparent display of the model teeth might help you see both the prepared tooth and the model tooth, thus facilitating accurate placement. Right-click on „Anatomic shapes“ in the "Show/Hide groups" window to toggle transparency for all library teeth – for details, see the "Showing/hiding objects in the viewer" section.

A light red color (for example [6]) marks an area where the tooth model is placed so close to the preparation that it lies within the material's minimum thickness. The software will automatically fill these areas during the adaptation of the tooth models. So, in the area marked by [6], once the tooth is adapted to the preparation, the fissure will not be as deep as in the original model tooth, due to the restriction enforced by the minimum material thickness.

HotkeyInstead of using the mouse for switching between modes [1-3], you can also leave button [1] pressed and use hotkeys to quickly toggle modes – this will save you a lot of time : Hold <CTRL> to switch to rotation, <SHIFT> to switch to scaling. Note that whenever hotkeys are available, they will be displayed in a "tool tip" for the respective button. So, in this case, you can simply move the mouse over button [1], and a help bubble will appear which reminds you of the available hotkeys.

When placing tooth models, it may be helpful to visualize intersection with the antagonists, if you have performed an antagonist scan ("View → Distance to antagonists" in the context menu). See the section "Visualizing intersections/distance to antagonists or anteriors" for details.

Restricting movements

In some cases, it may be useful to restrict possible movements to certain directions. Especially novice users who are not yet used to navigation in virtual 3D space will appreciate the options [4] which allows you to limit movements/scaling only to:

  • Mesial/distal direction only
  • Buccal/lingual direction only
  • Occlusal direction ("up and down") only
  • Mesial/distal and buccal/lingual direction only („move to all sides, but keep height“)

Moving all teeth simultaneously

You can move all teeth simultaneously by checking checkbox [5]. This is useful e.g. when all teeth are positioned too low or too high in the software's initial set-up suggestion. When done with the adjustments, click 'Next' to proceed to the next step. The model teeth will then be adapted to the preparations.

Chosing a different tooth model

To replace a tooth model by a different model (e.g. to put a premolar-shaped tooth on a molar preparation, due to space restrictions), right-click the tooth to replace and chose Load custom tooth model... - you can now select a different tooth model.