Keystone KeySplint Hard and Hard Clear

17 min

Keystone KeySplint Hard™ and Keystone KeySplint Hard Clear™ are available to produce splints and night guards.

The materials are rigid, biocompatible resins that are ideal for fast production. KeySplint Hard is tinted and KeySplint Hard Clear is clear.

This resin is compatible with the AO Polishing Cassette for splints and night guards in the vertical orientation only.

Resource Links

About. IFU, SDS

About the Material

Manufacturer Instructions for Use

Safety Data Sheet

Protocol

This downloadable handout provides important usage information, including instructions about storage and post-processing. Print it out and bring it into the lab!

KeyPrint KeySplint Hard Protocol v02.20.pdf

Dental Post-Processing Grids

One of our most popular downloads! This table provides washing and curing instructions for all supported dental resins.

Print it and use it in the lab as a quick reference.

English

Dental-Post-Processing-Grids_v0501.pdf

German/Deutsch

ZAHNÄRZTLICHES NACHBEARBEITUNGSGITTER v03.71 DE Deutsch.pdf

Spanish/Español

Rejilla de Posprocesamiento Dental v03.71 ES Espanol Spanish.pdf

Performance Qualification Certificate

Download the certificate here.

Tthe following resin dropdowns may be used with the printer/cassette combinations noted with ✔️.

	M2		M3/M3 Max
Resin Dropdown	C2	C4	D1	D4
AO-Polish Keystone KeySplint Hard Clear*	❌	✔️	❌	✔️
AO-Polish Zirlux Nightguard & Splint Rigid*	❌	✔️	❌	✔️
Keystone KeySplint Hard	✔️	❌	✔️	❌
Keystone KeySplint Hard Clear	✔️	❌	✔️	❌
Zirlux Nightguard & Splint Rigid	✔️	❌	✔️	❌

*The AO Polishing Cassette is available for splints and night guards in the vertical orientation only.

Design Recommendations

Carbon does not provide design recommendations for these indications.

Carbon encourages users to follow the guidelines of your design software for Splints and Night Guards.

For example, 3Shape Splint Designer requires a 1.5 mm minimum wall thickness.

Both single and double-sided splints and night guards print well when following design software guidelines.

Perimeter Edge

Ensure that the perimeter of the splint does not come to a sharp 'knife' edge, as this makes support attachment difficult.

The perimeter should at least be as wide as the tips of the supports to ensure ample space for support connection.

Supports connect well to a round edge

Supports will not connect to a sharp knife edge

Print Preparation

Orientation and Supports varies by part type and orientation strategy for splints and night guards.

All Types | Vertical Orientation Compatible with the AO Polishing Cassette

Single-Sided | Tilted Orientation

Double-Sided | Tilted Orientation

Layout, Print Controls, and Project Analysis are the same for all indications.

Orientation and Supports

Select the indication type and orientation strategy (where applicabe) to expand the steps for orientation and supports.

Proper orientation of splints is critical to:

Maximize yield by minimizing print defects

Achieve the required accuracy and surface quality

Single-Sided Splint

40º tilt with anterior rotated away from platform

Intaglio surface facing platform

Orient

Click on Orient (Shift + O) in the top bar in the printer interface.

In the lower right corner of the bottom bar, turn on Overhang Detection (V) and set to 40 degrees. Areas that need support will appear red.

Orient the splint so that the intaglio surface is facing the platform

Adjust the splint so that it is mostly parallel with the platform

Rotate the splint so that it is at a 40 degree angle from the platform with the posterior close to the platform

Support

Carbon recommends using fences. They are easy to remove and do not increase the footprint of the splint, enabling more to be fit onto the build platform.

💡Toggle Platform Off ('B' keyboard shortcut) This will hide the platform and allow a clear view while you are adding supports.

Click on Supports (Shift + S) in the top bar in the printer interface.

For the Part Position, select Above to lift parts off the platform.

Click the Manual tab and select Fence for supports generation method.

Add supports

Click a series of points on the perimeter of the splint to define a fence.

Click Esc key on keyboard to end a fence and begin another.

Carbon recommends making a series of small fences, rather than making a single continuous fence, to give greater flexibility to reposition points.

Hold down the E key and click with the mouse to reposition points.

Click Generate to create the fence geometry. This may take a few minutes.

Continue steps 1 - 4 until the entire perimeter is supported.

Click Done in the upper left corner when finished.

https://player.vimeo.com/video/1035385172

Support the entire perimeter of the platform side of the model.

Avoid supporting areas that come in direct contact with teeth as this can affect fit and function.

Example of well-supported tilted splint

Double-sided splints are oriented similarly to single-sided splints, but determining which side should be supported requires comparing both sides using Overhang Detection. Carbon recommends supporting the side that has the fewest overhangs and thus requires the fewest supports. This has a number of benefits:

Part accuracy resulting from fewer unsupported overhangs on intaglio surface.

Minimizes time creating the supports in the software.

Reduces resin usage.

Reduces finishing time by minimizing support nubs.

Each splint is evaluated by duplicating it, flipping the copy, turning on the Overhang Detection tool, and then seeing which part has the fewest overhangs (red area).

If there is not a clear difference, then either side may be supported.

In this example, the maxillary side of the splint has fewer overhangs and should be the side that is supported.

Proper orientation of splints is critical to:

Maximize yield by minimizing print defects

Achieve the required accuracy and surface quality

Double-Sided Splint

40º tilt with anterior rotated away from platform

Mandibular or maxillary surface facing platform to minimize supports

Orient

Click on Orient (Shift + O) in the top bar in the printer interface.

Adjust the splint so that it is mostly parallel with the platform. Either side of the splint can face the platform.

Duplicate and flip the splint

Click Layout in the main bar in the printer software.

Click the splint model to select it.

Enter 1 in Number of copies and click Duplicate.

A duplicate of the model will appear.

Click Orient in the main bar.

Type 180 in the Y Axis field and press Enter.

Click Layout again.

Move the models apart from each other so they do not overlap.

https://player.vimeo.com/video/1035419148

You now have 2 copies of the splint:

One with maxillary impression facing the platform.

One with mandibular impression facing the platform.

Rotate double-sided splints so that it is at a 40 degree angle from the platform with the posterior close to the platform

Select both models

Rotate the splints until the anterior portions are at 40 degrees from the platform.

The posterior of the splint should be touching the platform.

Compare overhangs

Click Toggle Platform button in the lower toolbar or press the B key to hide the platform. This will allow you to see the overhang areas clearly.

Click Overhang Detection or press the V key and set to 30º to find areas that need support.

Orient the camera so that you see the models from the bottom (platform side) and can clearly see the red overhang areas.

Orbit around the models as needed to make sure you can see all overhang areas.

You may want to adjust the model tilt ±5º to reduce overhangs. You can adjust the models independently.

After carefully comparing the models, delete the model that has the most overhangs. If there is no clear difference in overhang area, either one is fine to select.

Support

Carbon recommends using fences. They are easy to remove and do not increase the footprint of the splint, enabling more to be fit onto the build platform.

💡Keep Platform Off ('B' keyboard shortcut) This will hide the platform and allow a clear view while you are adding supports.

Click on Supports (Shift + S) in the top bar in the printer interface.

For the Part Position, select Above to lift parts off the platform.

Click the Manual tab and select Fence for supports generation method.

Add fence supports along perimeter

Click a series of points on the perimeter of the splint to define a fence.

Click Esc key on keyboard to end a fence and begin another.

Carbon recommends making a series of small fences, rather than making a single continuous fence, to give greater flexibility to reposition points.

Hold down the E key and click with the mouse to reposition points.

Click Generate to create the fence geometry. This may take a few minutes.

Continue steps 1 - 4 until the entire perimeter is supported.

Click Done in the upper left corner when finished.

https://player.vimeo.com/video/1037613846

Support the entire perimeter of the platform side of the model.

Avoid supporting areas that come in direct contact with teeth as this can affect fit and function.

Add additional patch supports as needed

Double sided splints may require additional supports, especially for overhangs on the anterior lingual surfaces. Use Patch supports for these areas.

Click Patch.

Click an area of overhang.

Under Patch, set Overhang to 30º.

Set Primary Support Type to Fence.

Check the Boundary Fence box.

Click Generate All to create the supports.

Repeat as needed for additional areas of overhang.

https://player.vimeo.com/video/1037636311

Double-sided splints may require additional supports on polished/cameo surfaces.

If the supports are attaching at a horizontal angle, they may detach during printing causing part deformation. Supports should attach to the surface of the part that is facing the platform creating vertically oriented support tips. Please reapply the supports and move the attachment points to address this issue if this problem occurs.

Troubleshooting

If the supports are attaching at a horizontal angle, they may detach during printing causing part deformation. Supports should attach to the surface of the part that is facing the platform creating vertically oriented support tips. Please reapply the supports and move the attachment points to address this issue if this problem occurs.

Example of well-supported tilted splint

Layout

If necessary, nesting can be changed manually:

Click and drag parts to adjust their position.

Modify Z rotation by using the Spin tool The software will try four 90 degree rotations to maximize the build. You may rotate the part in the Z axis prior to running autolayout where it may be advantageous to fit more models.

Any Z orientation is acceptable

Use the Part List tab as needed to more easily select models and focus on them.

Print Controls

Project Analysis

Post-Processing

Pre-Cure

Reminder from the Keystone Industries® KeyPrint® KeySplint Hard™ IFU :

Using a clean foam swab dipped in IPA, wipe the entire intaglio surface of each part.

Curing

All approved curing units use the same settings for both KeySplint Hard Clear and KeySplint Hard with the following exception:

Post-Curing Coloration

A yellow tint is expected and normal after curing parts printed in the KeySplint Hard and KeySplint Hard Clear resins.

The yellowish tint will fade away within 24-48 hours.

If after this time period you are still experiencing issues with discoloration, please contact Carbon Support with a detailed description of the issue.

The final color of your tinted splints is dependent on the cure chamber used.

Dreve PCU LED chamber results in a gray tint

Otoflash and PCU 90 cure chamber result in a light violet tint

Uvitron Intelliray 400W will produce a coloration that falls between the PCU LED and PCU 90

KeySplint Hard Clear is translucent after curing. Polishing reveals a water clear appearance.

Dreve PCU LED

Hard Clear - Use program Splint HC/KG

8 mins at 90% intensity with Nitrogen.

Hard - Use program Splint HT

10 mins at 90% intensity with Nitrogen.

Questions & Support

For questions about the resin properties, printing, washing or curing your parts, please contact the Keystone technical team:

Email: [email protected]

Phone:

U.S. and Canada 1-800-333-3131

EU +49 77 31 91 21 01

For questions about your Carbon printer or Carbon software settings used for this resin, please contact Carbon:

Email: [email protected]

Phone:

U.S. and Canada 1-650-285-6307 option 2

Germany +49 6102 5790849

UK +44 (0) 2082 647484

Printer UI: On the dashboard, select the Prints tab. Select one of the printed projects. Click Request Help in the lower right corner.