formlabs RS-F2-DLCL-02 Dental LT Clear V2 Resin User Guide

MANUFACTURING GUIDE
Dental LT Clear V2 Resin
Prepared: 03/08/2023 PRNT-0099 Rev 01

Dental LT Clear V2 Resin is a light-curable polymer-based resin designed for the fabrication of biocompatible, long-term use, removable dental and orthodontic appliances such as occlusal splints, night guards, or mouthguards by additive manufacturing. This Manufacturing Guide will give equipment, printing and post-processing recommendations and requirements to ensure the correct and safe usage of this material.

Specific Manufacturing Considerations

Dental LT Clear V2 Resin specifications have been validated using the hardware and parameters indicated below. For biocompatibility compliance, validation used a dedicated resin tank, build platform, wash unit and post-processing equipment that were not mixed with any other resins.

1. Hardware:
   a. Formlabs 3D Printer: Form 2, Form 3B/3B+, Form 3BL
   b. Print Accessories: Formlabs Build Platform, Formlabs Stainless Steel Build Platform, Formlabs Build Platform 2, Formlabs Tanks

2. Software:
   a. Formlabs Preform

3. Printing Parameters:
   a. Part Orientation: Intaglio surface facing away from the build platform at a 0 – 40° tilted angle
   b. Layer Thickness: 100 μm
   c. Part Thickness:
   • Occlusal Surfaces: 2 mm minimum
   • Walls: 1 mm minimum

4.  Recommended Post-Processing Equipment:
   a. Formlabs Processing Accessories: Form Auto
   b. Formlabs Validated Wash Unit: Form Wash, Form Wash L, Ultrasonic Wash Unit
   c. Formlabs Validated Cure Unit: Form Cure, Form Cure L, Fast Cure

PRINTING

1. Shake cartridge: Shake the cartridge before every print job. Color deviations and print failures may occur if the cartridge is shaken insufficiently.
2. Set up: Insert resin cartridge into a compatible Formlabs 3D printer.
3.  Printing:
   a. Prepare a print job using PreForm software. Import desired part STL file.
   b. Orient and generate supports.
   c. Send the print job to the printer.
   d. Begin print by selecting a print job from the print menu. Follow any prompts or dialogs shown
   on the printer screen. Printer will automatically complete the print.

PART REMOVAL

Remove the build platform from the printer. To remove parts from the build platform, wedge the part removal tool under the printed part raft, and rotate the tool. Formlabs Build Platform 2 may be used for easy, tool free removal. For detailed techniques visit support.formlabs.com.

WASHING

Place the printed parts in a Formlabs-validated wash unit with 99% Isopropyl Alcohol.

1. Form Wash or Form Wash L:
   a. Wash for 15 minutes or until clean in Form Wash or Form Wash L.
   b. Remove parts from the wash unit and soak in fresh Isopropyl Alcohol for 5 minutes.
   c. If parts do not appear clean after washing, consider replacing used Isopropyl Alcohol in Form Wash or Form Wash L with fresh solvent.

2. Ultrasonic Wash Unit:
   NOTE: Using Isopropyl Alcohol in an ultrasonic bath presents a risk of fire or explosion. When using an ultrasonic wash read and follow all safety recommendations from the ultrasonic wash manufacturer.
   a. Use clean 99% Isopropyl Alcohol for each wash.
   b. Place parts in a secondary disposable plastic container or plastic resealable bag then fill with 99% Isopropyl Alcohol, ensuring parts are fully submerged.
   c. Place the secondary container in the ultrasonic unit water bath and sonicate for 2 minutes or until clean.
   Washing efficacy depends on the ultrasonic unit size and power. Formlabs testing was conducted with ultrasonic units at 36 W/L or higher.

DRYING

1. Remove parts from Isopropyl Alcohol and leave to air dry at room temperature for at least 30 minutes. NOTE: Dry times can vary depending on the design of parts and ambient conditions. Do not let parts sit in Isopropyl Alcohol for longer than needed.
2. Inspect printed parts to ensure that parts are clean and dry. No residual solvent, excess liquid resin or residue particles should remain on the surface before proceeding to subsequent steps.
3.  If the residual solvent is still present, dry parts longer. If resin residue is still visible, rewash parts until clean and dry.

POST-CURING

Place the printed parts in a Formlabs-validated post-curing unit and cure for the required time.

1. Form Cure or Form Cure L:
   a. Cure for 60 minutes at 60 °C
   b. Allow the Form Cure or Form Cure L unit to cool down to room temperature between cure cycles.

2. Fast Cure:
   a. Cure for 6 minutes at Light Intensity 5
   b. Allow the Fast Cure unit to cool for at least 10 minutes between cure cycles.

SUPPORT REMOVAL & POLISHING

1. Support marks can cause abrasion if not removed and polished. Remove supports using a cutting disk and handpiece, cutting plier, or other appropriate finishing tools.
2.  Polish the printed appliances using typical dental polishing methods prior to patient use.
3. Inspect the parts for any cracks. Discard if any damage or cracks are detected.

CLEANING & DISINFECTION

1. Fully post-processed parts can be cleaned using a dedicated soft toothbrush with neutral soap and room-temperature water. Do not use toothpaste or any other cleaning products on parts printed with Dental LT Clear V2 Resin.
2.  The appliances may be cleaned and disinfected according to facility protocols. Tested disinfection method: soaking the finished appliance in fresh 70% IPA for 5 minutes. Do not leave the part in the alcohol solution for longer than 5 minutes.
3.  After cleaning and disinfection inspect the part for damage or cracks to ensure that the integrity of the designed part meets performance requirements. Discard if any damage or cracks are detected.

HAZARDS, STORAGE & DISPOSAL

1.  Cured resin is non-hazardous and may be disposed of as regular waste.
2.  See SDS for more information at support.formlabs.com

References

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