KeySplint Soft resin


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265,00 €
265,00 €

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Biocompatible resin designed for the 3D printing of flexible orthodontic devices with elastic memory.

In 2018 KeyStone Industries launched the KeyPrint line of 3D printing materials and ever since then numerous high quality KeyPrint dental resins have entered the market. One of those materials is the KeySplint Soft resin intended for the 3D printing of flexible nightguards, mouthguards, splints, repositioners and bleaching trays that combine the strength needed to protect teeth against disorders like bruxism with added flexibility for better patient comfort. It guarantees a faster turnaround and easy replacement, it can be warmed in water for easy placement and minimal chairside adjustments, and it only requires a simple cleaning procedure on the patient’s part (consult Care Guide document in Downloads Section).

Video 1: Introducing the KeySplint Soft resin. Source: KeyPrint.

Like all KeyPrint dental resins, the KeySplint Soft resin is fully biocompatible (cytotoxicity, irritation and sensitization) with 3 years of guaranteed shelf life, color stability and validation for multiple open-source printers thanks to its wide range of compatible wavelengths (385-405 nm). Some examples of compatible resin 3D printers are the UniZ Slash 2 and Phrozen Sonic XL 4K 2022, and a full list of validated equipment is available in the Downloads section. The KeySplint Soft resin is BPA, MMA and phthalate free, FDA cleared in the USA (510K), health licensed in Canada, and CE marked (class IIa).

A batch of splints 3D printed with the KeySplint Soft resin

Image 1: A batch of splints 3D printed with the KeySplint Soft resin. Source: KeyPrint.

Similarly to the KeySplint Hard resin, the KeySplint Soft resin is tough and durable enough to withstand the damage caused by bruxism, and it demonstrates tremendous abrasion and fracture resistance. Unlike the Hard version of this resin, KeySplint soft remains flexible with elastic memory, which allows the splint or guard to adjust well to the patient’s teeth and guarantees comfort with prolonged use. A study on the wear of the KeySplint Soft resin can be found in the Downloads section.

A splint before and after polishing with the KeyPolish kit

Image 2: A splint before and after polishing with the KeyPolish kit. Source: KeyPrint.

A common practice aimed at improving the surface finish of splints and guards is polishing. The edges and occlusal surfaces of splints 3D printed with the KeySplint Soft resin can be polished with the help of the KeyPolish polishing kit. Polishing the intaglio surface is not recommended as it can adversely impact the fit of the printed device. A complete polishing guide for this resin can be found in the Downloads section and a tutorial video is available in the Usage Tips section.

The KeySplint Soft precision dental resin by KeyPrint is the result of over a hundred years of experience that KeyStone Industries has accumulated in the polymer and dental sector. The KeySplint Soft resin produces biocompatible and reliable orthodontic devices that help many end users minimize the devastating effects of bruxism and guarantee ease of use for both the patient and the orthodontic specialist thanks to their flexibility and compatibility with many 3D printing and post-processing workflows.

Elongation at break (%) 110
Flexural strength (MPa) 4.4
Flexural modulus (MPa) 200
Surface hardness 9
Medical use Medical use

Before using the resin, the user should thoroughly study the product instructions, as well as the safety and technical datasheets available in the Downloads section. It must be remembered that dedicated accessories (resin tank, build platform, curing station) must be used for the KeySplint Soft resin (Downloads section). The dedicated accessories must not mix with any other resins to ensure the biocompatibility of the parts 3D printed with the KeySplint Soft resin.

The KeySplint Soft resin should always be stored in a cool, dry place (15-30 °C) and away from light, as it may cause curing of the resin and failed prints. In order to ensure successful prints, the bottle should be well shaken 1 hour before use and the resin should be tempered to around 23 ºC. If bubbles are present in the resin, they should be removed with a clean spatula prior to printing. It is a good practice to filter resin that has been in the tank for a while in order to avoid failed prints. Proper personal protective equipment should be worn at all times when handling the KeySplint Soft resin and uncured printed parts to avoid burns and other injuries. Protective gloves and garments as well as face protection should be used.

Video 1: How to wash parts 3D printed with the KeySplint Soft resin. Source: KeyPrint.

Parts 3D printed with the KeySplint Soft resin require washing and curing in order to perform their function. The parts should be washed twice in a clean IPA alcohol (>97% purity) bath just like shown in video 1, and then dried with compressed air. Any residual resin will be highly noticeable and it will not dry under the compressed air. This residue should be removed completely by repeating the bath and drying process. The total IPA alcohol exposure should not exceed 5 minutes as the parts may start to degrade. As far as curing, the recommended curing parameters can be consulted on the manufacturer’s website.

Video 2: How to polish parts 3D printed with the KeySplint Soft resin. Source: KeyPrint.

In order for the orthodontic device 3D printed with the KeySplint Soft resin to have an aesthetically pleasing surface finish, polishing should be done just like shown in video 2. A complete polishing guide can be found in the Downloads section.

In case the 3D printed parts are going to be used as tooth whitening/bleaching trays, additional post-processing steps must be performed. For further instructions please consult the Instructions document in the Downloads section. The finished medical device resulting from following this validated post-processing workflow is safe, biocompatible, and effective for its intended use.

General information
Manufacturer KeyStone Industries
Technology  DLP
Material Photopolymer
Wavelength UV 385-405 nm
Format 0.5 kg
1 kg
1 kg cartridge for XiP (Nexa 3D)
Color Clear, violet
Compatible 3D printers List of compatible resin 3D printers
Printing properties
Layer height -
Layer exposure time -
Layer cooling time-
Lifting height-
Exposure of bottom layers-
Number of bottom layers-
Curing and washing properties
Washing time IPA 1: 15-30 s
IPA 2: 15-30 s
(Ultrasonic bath: 2-3 min)
Curing time Curing settings
Curing temperature -
Mechanical properties
Izod impact resistance (ASTM D256) 45-48 J/m (notched)
Charpy impact resistance -
Elongation at break (ASTM D638) 110 %
Tensile strength -
Tensile modulus -
Flexural strength  44-47 MPa (ASTM D790)
2.6-4.4 MPa (ISO 20795-2)
Flexural modulus  1100-1400 MPa (ASTM D790)
135-200 MPa (ISO 20795-2)
Surface hardness (ASTM D2240) Shore 80-85D
Thermal properties
Softening temperature -
Brightness value -
Additional information
Service life 36 months
HS Code 2916.1

* The typical values listed in this table should be considered as a reference. Actual values may vary depending on the 3D printer model used, part design and printing conditions. We recommend confirming the final results and properties with your own tests. For further information please refer to the product data sheet.


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