Application Guide

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Dental Die

Application Guide for Printing

Application: Model
Subtype: Die
Resin: QuraMODEL 2.0
Software: Alpha 3D

Dental Die Orientations

This guide covers printing dies in two similar orientations:

A. Angled: Dental dies are normally designed at an angle to match the normal shape of a dental model. Printing dies at an angle is relatively easy, but it may require more supports, and the final accuracy of the print at the tooth or crown fitting location may reduce. However, the fit of the die may be tighter than printing vertically, especially if printing the model horizontally (flat).

B. Vertical: Printing vertically usually improves overall die accuracy, and possibly reduces the amount of necessary supports. It takes a little more time to orient a die vertically, and it will take a little longer to print, because printing vertically increases the number of layers.

Both orientations print well enough for clinical and lab applications. Sometimes the same print will include dies designed from the same model that are better printed both ways, so it is possible to have both orientations in the same print.

1. Print Analysis

A. Critical Areas – Do Not Support

  • A- The goal for both die printing orientations is to have the best fit possible as well as the most accuracy on the die head, which may have a tooth or crown fitting. As such, both orientations position the die head at the top, so these orientations will have no supports along most of the die body, and, in particular, no supports on the tooth or fitting surface.

B. Intended Support Area

  • B1- The bottom of the die, including any friction nodes, will need the majority of the supports of this print.
  • B2- If the print has overhangs on the die head, those overhangs will need supports. More of these supports may be necessary when printing the dies in the angled orientation

2. Orientation

A. Angled Orientation: In the angled orientation, the majority of the die is positioned at an angle, but the bottom of the die is positioned flat. In this orientation, avoid having any local minimum points on the bottom of the die.

  • In Alpha 3D, to place a print flat, select the object, go to Orientation tab, and use the Select Base function.

B. Vertical Orientation: In the vertical orientation, the die is positioned as vertically as possible. This may add minimum points on the bottom, which will need to be supported individually.

  • In Alpha 3D, to position an object vertically, select the object, go to Orientation tab, and turn dies so that their sides are as straight as possible.
  • You may want to use the preset views to see the dies from the front and sides.

C. For both orientations, raise the part off the platform.

  • In Alpha 3D, you raise a part along with setting up its supports. Go to the Supports tab, and set the height in the parameters.
  • Support Height: 1.5 – 2.0 mm

3. Supports

You can print most dies using the same support parameters. However, larger dies require larger supports to be able to support their weight.

Support Parameters

  • Point Size: 0.4 – 0.7 mm
  • Elbow Size: 0.6 – 1.0 mm
  • Bottom Size: 0.9 – 1.4
  • Support Density: 84%
  • Support Height: 1.5 – 2.0 mm

Angled Orientation

  • The bottom will be flat, so there is not as much concern for finding the local minimum points. However, the part will be tilted enough that more supports are required on the side that the die is tilted toward.

Vertical Orientation

  • The bottom of the die will have at least one local minimum point, and if there is a friction node, at least one more point will appear above the friction node. This orientation may require supports for the overhangs, but usually fewer than the angled orientation.

Tip

Do not use Automatic Supports for this print. This print can be supported much faster with Manual Supports.
If your supports are too close together, move their bottoms so the supports have an angle and there is some separation between the bottoms of all supports.

Angled Orientation Support Area

Angled Orientation Support Result

Vertical Orientation Support Area

Vertical Orientation Support Result

4. Base

Ackuretta recommends adding a base to almost all supported prints. Adding a base allows the print to stick to the build platform securely, and it makes the print easier to remove during post processing.

  • If you use the General support setting, Alpha 3D automatically adds a small base to every support. This small base is sufficient for most prints.
  • Additionally, you can add a base around the entire print using the Base Thickness setting. This may make it easier to remove the print from the build platform.

Warning

A thicker base does not improve print performance. A base of 0.400 mm or thicker may even make a print less likely to succeed.

5. Print

Arrange all of the models that you want to print, and then go to the Print tab.

  • Select your Layer Thickness. Ackuretta recommends 100 microns.
  • Give your print a Job Name.
  • Click Save.

On your printer, make sure that your settings match what you need for your resin.

Diplo / Ackuray Print Settings

  • Buffer Layers: 5 layers
  • First Layer Curing: ×8

FreeShape 120 Settings

  • Burn-In Layers: 4 layers
  • Burn-In Layer Curing Time: ×3 curing time
  • Z-Axis Peel Speed: 950

7. Finishing

After printing, clean, dry, and cut your supports if you have any.

  • Cleaning Alcohol: Ethyl alcohol (95%) or isopropyl alcohol (99%)
  • Ultrasonic Cleaner or Soak Time: 2 minutes
  • Suggested UV Oven: Ackuretta UV Oven – Flash Setting
  • Suggested UV Oven Time: 4 minutes, flip, and then another 4 minutes
    • Use the Flash Setting by holding the start button down when beginning the cycle