Orthodontic

NextDent Model 2.0 is characterized by its high degree of accuracy, making this material suitable for detailed master prosthodontic and orthodontic models where high precision is needed. The models show highly visual details due to color and opacity and has an ideal surface for scan impressions.

The accurate printed models are the perfect base for creating your dental work piece. Available in colors Oker, Peach, White and Grey.

Accuracy Tips

In order to achieve good accuracy on Model 2.0 materials it is important to follow the part setup instructions below for orientation and supports. Some other key tips are as follows:

  1. For best results use the Resin Mixer to gently stir between prints and after the resin has been sitting overnight.

    CAUTION: Do NOT press down on the film when stirring.

  2. Allow parts to dry completely, a minimum of ten minutes, before post cure.
  3. Verify proper cleaning method. Insure cleaning solvents are not saturated.
  4. The Orthodontic build style in 3D Sprint is optimized for fast printing of orthodontic models.

Orientation - "Horseshoe" Model

All horseshoe models regardless of the orientation must be supported by a bar between the model’s molars.

model-bar-support.jpg
Figure 1. Support bar example.

There are two methods to create a support bar:

  1. Create Bars tool - 3D Sprint 2.13 and above
  2. Generate Geometry tool - 3D Sprint 2.12 and lower

1. Create Bars - 3D Sprint 2.13 and above

  1. Import your model into 3D Sprint.
  2. Click the create-bars.jpg tool.
  3. Enter values for all parameters. The below image shows the recommended values:
    create-bars-params.jpg
    Figure 2. Create bars dialog.

     

  4. Click on the two contact points and click Apply.
    create-bars-connect-points.jpgcreate-bars-bar-connected.jpg
    Figure 3. Create support bar.

2. Generate Geometry - 3D Sprint 2.12 and lower

  1. Click Generate Geometry tool generate-geometry.jpg.
  2. Create a cylinder with a 2mm radius.
    mod-20-ortho-fig-2.jpg
    Figure 4. Create cylinder.
  3. Orient the support bar to 90° from the Y axis. Then use the Transform tool transform-tool.jpg to place the support bar between the model's molars.
    mod-20-ortho-fig-2-1.jpgmod-20-ortho-fig-2-2.jpg
    Figure 5. Insert cylinder in model.
  4. Ensure both the orthodontic model and the support bar are selected. Then use the Combine/Separate tool combine-separate.jpg to combine the support bar and orthodontic model into one part. Now, auto-generate supports with the Smart Support tool.
    mod-20-ortho-fig-3.jpg
    Figure 6. Use Combine/Separate Tool.

Orientation - Arches

  • Solid horseshoe models must be printed vertically.
  • Hollow horseshoe models can be printed vertically or horizontally.

Orientation - Full Palate Models

Full palate models should be oriented in a way that prevents cupping. Depending on the model, an angle between 15° and 30° may be needed to remove the trapped volume and for resin/air clearance.

Rotate the part and then use the Z-Clipping Tool in the View window to see the cross sectional areas of the part. Find the largest cross section and then rotate the part 15-30 degrees to reduce the cross sectional area.

model-20-fig-6.jpg

Figure 7. Cross sectional view of full palate model using Z-Clipping tool.

 

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Figure 8. Cross sectional view of full palate model using Z-Clipping tool at largest cross section.

 

model-20-fig-8.jpg

Figure 9. Right side view of full palate model oriented parallel to XY-plane.

 

model-20-fig-9.jpg

Figure 10. Right side view of full palate model oriented at angle to reduce cross section.

 

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Figure 11. Cross sectional view of full palate model using Z-Clipping tool at largest cross section after rotation.

Figure 12. Example of right vs. wrong orientation to prevent cupping.

Supports - Arches

  • Ensure the Orthodontic support style is used.
  • Vertical arches can be tilted to minimize supports on critical surfaces (~10° depending on model).
    tilt-arch.jpg
    Figure 13. Left - Vertical model with more supports. Right - Tilted model to reduce supports.

Supports - Full Palate Models

  • Ensure the Orthodontic support style is used.
  • Extra supports may be required around the palate area to ensure accuracy and print quality.
mod-20-ortho-fig-7.jpgmod-20-ortho-fig-7-1.jpg
Figure 14. Left - Default supports. Right - More supports added.