Global Registration Tab
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Global Registration Tab

Use the Global Registration tab to adjust the position of the upper and lower arch models relative to the 3D space.

You can also use this tab to simulate movements from mechanics used, such as elastics.

Translation [mm] / Rotation [deg] Controls

Click in the table cell to adjust translation and rotational movements for the upper and lower jaws.

Note: Global movements for surgical cases can only be made from the Surgery tab. The table cells are unavailable for any arch which has been marked surgical in the Special Instructions of the MACROS form.

Use Common Rotation Axis

Default is checked. Uncheck if you do not want both arches to use a common axis of rotation.

Note: Using the common axis in the center of the model does not change the bite, as both jaws are moved together.

When checked, the whole model with both jaws uses a common coordinate system with the xyz axis always in the middle of the model.

When unchecked, each arch moves independently on its own axis.

Note: Global and surgical movements can only be made using the common rotation axis.

Demonstration: Common Rotation Axis

If you want to experience the difference between the common and single rotation axis, perform the following exercise:

  1. Open a Plan in production without tooth movements.

  2. Go to the Global Registration tab.

  3. Display the Lower Occlusal view.

  4. Show the upper/lower contacts.

  5. Check the Use Common Rotation Axis check box.

  6. Type 20° into the upper and lower cell for rotation around the sagittal axis.

  7. Observe the location of the contacts.

  8. Click Reset. The location of the contact areas is exactly the same.

  9. Click Redo  to verify that the location of the contacts is always the same  when using the Common Rotation Axis feature.

  10. Now uncheck the Use Common Rotation Axis check box.

  11. Repeat steps 2-9.

  12. Note that this time the location of the upper/lower contacts change, because each jaw uses its own rotation axis.

Sync U/L

Check to synchronize both the upper and lower arches together when making global adjustments.

Use Condyle Axis

Check to simulate the natural movement of the lower jaw rotating around the condyle axis. When you rotate the bone segment, the axis of rotation is relative to the condyle.

When checked, all other cells are grayed out. Clearing the check box adds movements to the other cells, such as anterior/posterior or vertical movement. This is due to the different rotation axis.

Malocclusion Includes Max. / Mand. Alignment Adjustments

When checked, the therapeutic model includes planned global movements. In the Global Registration Tab the default is unchecked, because typically you want to see the global movements back and forth between white and blue teeth.

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Horizontal incl. AP

Use the controls or enter values directly to rotate the model anteriorly /posteriorly to adjust its position with the ceph.

Facial axis inclination

Use the controls or enter values directly to rotate the model left or right to adjust the cant.

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Articulation

Check to open the Articulation window. Use the Articulation tool to check if there are any tooth collisions or other problems during chewing, and to adjust the angle of the articular eminence as necessary .You can also adjust the angle of the articular eminence to more accurately display the patient’s chewing motion.

Tip: You can use the Articulation tool anytime, but a good point in your workflow would be during therapeutic model review.

To adjust the angle of the articular eminence during the therapeutic model review:

  1. Click the Checklist icon in the menu bar and click the Ceph Review step.

    Result: The articular eminence slope line is shown by default in the ceph view, as this is the recommended view for setting the articular eminence slope.

    Tip: Zoom the model out to educe the view so that you can see the condyle.

    The anatomical points display in a default position—the top line is the horizontal plane, which is parallel to the Frankfort plane. The left most point is initially set by the Digital Lab to mark the dorsal point of the articular eminence. The other point is the handle for changing the slope of articular eminence. It is set to a default angle of 20 degrees.

    Note: In some CBCT scans, the condyle may appear less clear than expected. This is due to the condyle being less dense than the surrounding bone mass.

  2. Select the slope line handle by clicking on it. It turns pink when selected. Drag it up or down to define the slope of articular eminence relative to the horizontal (Frankfort) plane. Drag anteriorly or posteriorly to shorten or lengthen the line. Notice that the angular value (in degrees) changes as you move the point. The slope of the articular eminence determines how the mandible slides forward and moves excursively as it opens. The length of the line of articular eminence determines how wide the bite will open in the chewing simulation.

    The large green dot corresponds to the condyle. It moves along the line of articular eminence when you run an articulation animation.

    Note: The horizontal plane is defined on the Ceph. Adjust as needed using the Horizontal Inclination control under the Global Registration tab.

  3. Click Apply in the articular eminence slope confirmation box to save your changes

    or

    Click Undo to discard your changes.

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View and Test the Articular Eminence Slope

Use the Articulation tool to check if there are any tooth collisions or other problems during chewing.

Note: It is not necessary to view articulation when you set the articular eminence slope, but the feature is available if needed.

  1. Under the Global Registration tab, click Articulation.

    Result: The Articulation window opens.

    In the side windows, view the upper and lower 3D models occlusally with contacts on.

  2. On the Animation control box:

    • Click the upper Run Animation button to run the articulation simulation

     or

    • Click and drag the slider control to manually operate the animation.

    Result: The jaws open and close. Notice that the green condyle indicator moves along the line of articular eminence.

  3. In the side windows, check for any collisions.

  4. On the Animation control box:

    • Click the lower Run Animation button to run the excursive simulation.
      OR

    • Click and drag the slider control to manually operate the animation.

    Result: The left-to-right movement (lateral excursion) is animated.

    Note: Because the virtual articulator does not consider cuspid rise, multiple tooth collisions will be seen.

  5. In the side windows, check for any collisions.

  6. Click either Run Animation button a second time to stop the animation.

Surgery On/Off check box

The Surgery On / Off check box  allows doctors who have an approved surgical setup to create a new non-surgical setup or simulation. This check box becomes visible on the Global Registration tab for a setup or simulation in work if the previous setup for the case is a finished surgical setup.

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