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Permanent Crown Resin - Formlabs

Ref.: RS-F2-PRCRW-A2

790.00 €

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Approximate delivery date: Wednesday 8 January - Monday 13 January

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Permanent Crown resin is part of the line of resins specific to the dental field from the renowned manufacturer Formlabs. In the dental field, the use of 3D printing as a manufacturing tool is becoming more and more common. The dental resins (biocompatible) allow models of crowns and bridges, surgical guides, splints or retainers to be made with incredible accuracy and with very low material costs for each element, which allows the use of the printer with any of the dental resins to be amortised in a few months.

Permanent Crown resin is a tooth-coloured ceramic-reinforced resin for 3D printing of permanent crown, inlay and onlay type restorations and veneers. Digitally created restorations allow a fast collaborative process between dentist, technician and patient.

Like other Formlabs dental resins such as Temporary CB resin, the Permanent Crown resin is available in four VITA shades, perfectly adapting to the shade of each patient's teeth:

Image 1: VITA colour sample book. Source: vita-zahnfabrik.

Thanks to the properties of the Permanent Crown resin, pieces with an excellent stability and dimensional resistance are obtained. In addition, this resin allows a resolution of 50 microns, resulting in a very high surface quality and level of detail.

To print with the Permanent Crown resin, a Stainless Steel Fabrication Platform is required. The Permanent Crown resin contains a ceramic filler that would produce abrasion on the standard printing platform, causing contamination of the resin and possible staining or colour modification. By using the Stainless Steel Fabrication Platform, abrasion and its negative effects are avoided.

In addition, parts printed with Permanent Crown resin can be tinted using light-curable coatings such as GC Optiglaze.

Image 2: Pieces printed with Permanent Crown and example of shaded pieces. Source: FormLabs.

The combined use of the Stainless Steel Fabrication Platform and the Permanent Crown resin ensures a uniform tone and the maintenance of the material's properties.

Thus, the Permanent Crown resin is a biocompatible material that can be permanently implanted. Therefore, this resin is not compatible with the Form 3 3D printer. In order to use the Permanent Crown resin and carry out the printing process optimally, the following materials and devices should be used:

Form 2 or Form 3B 3D printer.
It requires a LT resin tank if using the Form 2 printer and a V2 Form 3 resin tank if using the Form 3B printer.
Stainless Steel Fabrication Platform.
Permanent Crown Resin.
Form Wash or Finish Kit.
Form Cure.

To ensure the biocompatibility of the Permanent Crown resin, the use of dedicated tanks, stainless steel construction platform and finishing kits are required and should only be used with this and other biocompatible Formlabs resins.

General information
Manufacturer	FormLabs
Material	Photopolymer
Format	1 L
Technology	SLA / LFS
Wavelength	UV 405 nm
Compatible resin tanks	Form 2 LT / Form 3
Compatible 3D printers	Form 2 / Form 3B

Printing properties
Layer height	50 µm
Layer exposure time	-
Layer off time	-
Bottom layer exposure	-
Bottom layer count	-

Curing and washing properties
Washing time	3 min
Curing time	20 + 20 min
Curing temperature	60 ºC

Mechanical properties (uncured / cured)
Izod impact strength	- KJ/m²
Charpy impact strength	- KJ/m²
Elongation at break	- %
Tensile strength	- MPa
Tensile modulus	- MPa
Flexural strength	(ASTM D790) 116 MPa
Flexural modulus	(ASTM C790) 4090 MPa
Surface hardness	-

Thermal properties (uncured / cured)
Softening temperature	- ºC

Other
HS Code	2916.1
Lifetime (since manufacturing)	24 M

Here below, a series of usage tips that must be taken into account at all times with the use of FormLabs resins are cited:

Change cartridge

Changing the resin cartridge of the FormLabs printers is very simple, just close the top cap of the ventilation duct (vent) and remove the cartridge by holding it by the handle it has. Then the other is inserted and the vent plug is opened in case an impression is to be started. To avoid drips through the 3D printer, this process must always be carried out with the resin tank mounted.

Tapón de ventilación FormLabs

Image 1: Ventilation cap for FormLabs cartridges. Source: FormLabs

After finishing each print, the top cap must be closed so that the resin maintains its properties. In addition, if the printer is not used for some time, the cartridge should be stored in its original box to keep the properties of the resin intact.

Resin tank

Each type of resin should have its own resin tank, which should be changed after using 2L of resin. The Temporary CB resin is compatible with the LT resin tank and the Form 3 resin tank.

Tanque de Resina LT de FormLabs

Image 2: FormLabs Resin Tank LT. Source: FormLabs

To protect and store the excess resin in the tank after each printing, FormLabs supplies a lid that ensures a perfect closure. Once the tank is closed, it is recommended to store it (with resin and lid) in the original box so that the resin doesn't lose its properties when exposed to UV rays for a long time. Another point to keep in mind is that the tanks can't be cleaned with any cleaning product or similar (for example, isopopyl alcohol), since they lose certain qualities that can cause continuous failed impressions.

Failed printing

When an error occurs in printing may be because solid parts of a previous printing have fallen to the resin tank. In this case, a spatula at 45° must be passed through the printing tank, gathering all the solid parts in a corner and removing them. To ensure that the tank resin doesn't contain any solid parts, the resin should be cast with a 190 μm paper filter. Once cast, it is put back into the tank and it is ready to be used again.

Video 1: Clean resin tank. Source: FormLabs

Isopropyl alcohol

Isopropyl alcohol is the key to the washing and post-processing of parts and you should know when it is time to change it. In the Finish Kit the moment to change it's when the IPA (Isopropyl Alcohol) is so saturated with resin particles, that after washing the pieces are still sticky. At that point you must remove all the liquid, clean the container well and throw new IPA, but never fill in on the previous one.

Finish Kit FormLabs

Image 3: Finish Kit FormLabs. Source: FormLabs

In the Form Wash, the wash center itself indicates through its screen when it is time to change the isopropyl alcohol.

Video 2: FormLabs Ecosystem. Source: FormLabs

If you wish you can hire our SLA 3D printing training courses (online or in person) by contacting us through the contact form. The training is oriented to obtain a wide knowledge and know how to use the 3D SLA FormLabs printers from the beginning and thus avoid major errors.