NextDent Denture 3D+

NextDent Denture 3D+ is a biocompatible Class IIa material suitable for printing all types of removable denture bases. This material has significant lower shrinkage compared to standard PMMA denture base materials. Shrinkage can be compensated by using dental software resulting in excellent fitting denture bases. This material has excellent mechanical properties and is comparable to conventional denture base materials.

Accuracy Tips

In order to achieve good accuracy with Denture 3D Plus it is important to follow the part setup instructions below for orientation and supports. Some other key tips are as follows:

  1. For improved model-fit, angle palate-fitting surface 30 degrees away from the build area
  2. Rather than deleting auto-generated supports, consider angling your palate 20 or 40 degrees from the build area and auto generating supports in either of these orientations. Removing critical supports because they interfere with a margin line may affect print quality.
  1. Increase the cement gap in your part design if teeth fit poorly. 
  2. 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.

  3. Verify proper cleaning method. Insure cleaning solvents are not saturated and parts are allowed to dry before post cure.

Orientation - Palates

Orient part with the top of the teeth facing down into the grid on 3DSprint™. Use Transform functions to orient part at approximately 30-degrees with the labial side facing the XY-plane on the 3DSprint™ grid. This is the support side.

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Figure 1. Rotated and supported palate oriented 30-degrees to XY-plane supporting labial side.

 

Add Supports – Palates

Add supports to the part using the Create Supports function under the Smart Supports icon. Look at the supports and determine how they may need to be modified. The supports should not be close to or on the gum line. As shown in image on right.

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Figure 2. Bottom view of support node placement with nodes modified to be off of the gum line for the image on the right.

 

Orientation – Lower Dentures

Orient part with the top of the teeth facing toward the grid on 3DSprint™. Use Transform functions to orient part such that the front is facing towards the grid of the XY-plane in 3DSprint™.

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Figure 3. Lower denture oriented correctly.

 

In addition, a support bar should be added between the two trigonum of the arch. This can be done using 3DSprint™ GENERATE GEOMETRY function in the PREPARE tab.

Click on the part, then select PREPARE on the bottom right to move the part into the PREPARE tab window.

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Figure 4. PREPARE button is on lower right of window.

 

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Figure 5. Part is shown in PREPARE tab window.

 

Go to the GENERATE GEOMETRY icon and create a 2x60mm round bar for support. This part will be used to merge with the lower denture to create a support bar.

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Figure 6. Create 2x60mm cylinder part.

 

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Figure 7. Newly created 2x60mm cylinder part and lower denture part.

 

Use the Transform function to move the support bar into place.

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Figure 8. Support bar moved into place on lower denture part

 

Once the support bar is in place, verify it does not stick out into the fitted surface, but does extend into the lower denture part. Use the SPLIT function to shorten each end of the bar to the appropriate size. Do not use CONNECTORS when using SPLIT function.

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Figure 9. Support bar extends thru the walls into the fitted surface of the lower denture part

 

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Figure 10. SPLIT function to cut part down to fit.

 

Use the VIEW function and select TRANSPARENT to verify the support bar is in the correct position.

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Figure 11. Support bar ends are within the walls of the lower denture part.

 

Select the BOOLEAN function and highlight both parts to UNITE them into a single part. Note the parts can be selected by clicking on the names on the Parts List on the top right of the window while holding the Control key. Once complete, highlight the part and click on the Add to Print button on the bottom right.

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Figure 12. Boolean parts together.

 

Add Supports – Full Arches

Add supports to the part using the Create Supports function under the Smart Supports icon. Look at the supports and determine how they may need to be modified. The supports should not be on the fitted surface. As shown below. These are a result of bad part orientation.

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Figure 13. Supported part with added support bar.

 

Reorient the part and check for support nodes on the fitting surface. If nodes still appear, then remove them using the Modify tools in Smart Supports window.

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Figure 14. Right and back view of supported arch. The part on the right has relocated support nodes to be off of the gum line.

 

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Figure 14. Correctly supported lower denture.