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KeySplint Hard resin

Ref.: KPRINT-KEYSPLINT-HARD-500

265.20 €

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Approximate delivery date: Monday 15 December

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KeyPrint is a line of 3D printing resins for the dental industry developed by KeyStone Industries. These materials are known for their high quality, affordability, versatility, and safety. One of the dental resins in the portfolio is the biocompatible photopolymer KeySplint Hard, designed for 3D printing orthodontic and dental appliances such as bite splints, mouthguards, night guards, snoring devices, aligners, repositioners, and retainers. KeySplint Hard produces biocompatible medical devices that are FDA-cleared in the U.S., licensed for sale in Canada, CE-marked (Class IIa), and free of BPA, MMA, and phthalates.

Video 1: The advantages of using KeySplint Hard resin. Source: KeyPrint.

One of the most outstanding characteristics of KeySplint Hard resin is the durability of the orthodontic appliance printed with it. Most similar resins on the market turn out to be too brittle to withstand severe bruxism. KeySplint Hard, however, is extremely resistant to abrasion, staining, and wear, demonstrating excellent fatigue resistance without tearing or cracking, outperforming competing materials. A wear study on KeySplint Hard can be found in the Downloads section.

A batch of 3D-printed splints made with KeySplint Hard resin

Image 1: A batch of 3D-printed splints made with KeySplint Hard resin. Source: KeyPrint.

KeySplint Hard resin is also particularly useful in cases where teeth need to be immobilized after an injury, as its rigidity prevents unwanted movement. This rigidity also allows for finer details and thinner segments in more complex devices, broadening the range of 3D dental applications achievable with this resin. Another successful application of KeySplint Hard was the 3D printing of durable intraoral communication devices for emergency workers and military personnel. A detailed care guide for orthodontic devices printed with KeySplint Hard is available in the Downloads section.

A common practice to improve the surface finish of splints and guards is polishing. The edges and occlusal surfaces of splints 3D-printed with KeySplint Hard resin can be polished using the KeyPolish polishing kit.

A splint before and after polishing with the KeyPolish kit

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

Polishing the intaglio surface is not recommended, as it may negatively affect 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.

KeySplint Hard resin has been designed for DLP printers operating at wavelengths between 385–405 nm, whereas most similar resins on the market only work within the lower wavelength range. This makes KeySplint Hard compatible with many printers, such as the UniZ Slash 2 and the Phrozen Sonic XL 4K 2022. A full list of validated equipment is available in the Downloads section.

The KeySplint Hard resin is also available in sand, clear, and translucent versions, compatible with the A2D HD printer from HeyGears. In addition, each resin includes an RFID card that allows the printer to automatically identify the resin type, ensuring a precise and efficient printing process.

Thanks to its strength, durability, and ease of printing and post-processing, KeySplint Hard resin significantly outperforms competing 3D printing resins available on the market. Its simple and reliable workflow results in parts that stand the test of time, and the potential applications of KeySplint Hard extend well beyond orthodontic devices. KeySplint Hard is not only biocompatible but also highly regarded by dental health professionals.

General information
Manufacturer	KeyStone Industries
Material	Photopolymer
Format	0.5 kg / 1 kg
Density	- g/cm³
Technology	DLP/LCD
Wavelength	UV 385-405 nm

Printing properties
Layer height	- µm
Layer exposure time	-
Layer off time	-
Bottom layer exposure	-
Bottom layer count	-

Curing and washing properties
Washing time	15-30 s / 2-3 min
Curing time	- min

Mechanical properties (uncured / cured)
Izod impact strength	- KJ/m²
Charpy impact strength	- KJ/m²
Elongation at break	(ASTM D638) 9 %
Tensile strength	- MPa
Tensile modulus	- MPa
Flexural strength	(ASTM D790) 100-110 MPa / (ISO 20795-2) 60-65 MPa
Flexural modulus	(ASTM D790) 2300-2400 MPa / (ISO 20795-2) 1510-1600 MPa
Surface hardness	(ASTM D2240) Shore 89 D

Thermal properties (uncured / cured)

Other
HS Code	2916.1
Lifetime (since manufacturing)	36 M

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 Hard 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 Hard resin.

The KeySplint Hard 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 Hard 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 Hard resin. Source: KeyPrint.

Parts 3D printed with the KeySplint Hard 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. The finished medical device resulting from following this validated post-processing workflow is safe, biocompatible, and effective for its intended use.

Video 2: How to polish parts 3D printed with the KeyPrint resins. Source: KeyPrint.

In order for the orthodontic device 3D printed with the KeySplint Hard 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.