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The unit enables the photopolymerisation of all light-curing materials within the wavelength range of 280–580 nm, thereb
Light-curing unit for the polymerisation of 3D-printed components in just 6 - 10 minutes. The high-performance LEDs used
The role of light curing (post-polymerisation) in dental 3D printing
Post-curing determines the quality of your 3D-printed objects. It is this process that gives the printed objects (e.g. denture bases, splints) their final properties – from mechanical strength to biocompatibility. Working closely together, our materials scientists, dental technologists and product experts develop coordinated solutions for the 3D printing workflow in dental laboratories or dental practices, including our optiprint premium resins. Light curing, as part of the post-processing stage in 3D printing, always plays a key role.
Basics of polymerisation
The principle is simple and effective: targeted light exposure causes liquid monomers to cross-link into solid polymers. We rely on a combination of UVA and UVB radiation. Whilst UVA penetrates deep into the material, UVB ensures rapid surface curing. Our three coordinated devices utilise this technology to achieve optimal results.
An overview of our light-curing units
RapidShape RS cure combines high-performance LED technology with heating and vacuum for exceptionally fast results. The uniform 360-degree curing in just 6 to 10 minutes makes the unit particularly efficient – ideal for complex structures in the UV-A and UV-B ranges. Otoflash G171 impresses with a broad wavelength spectrum of 280–580 nm. This versatility not only enables effective UV curing but also accommodates different material formulations and pigmentations. The special flash technology ensures particularly thorough curing. The Ackuretta UV Box offers maximum flexibility with wavelengths of 365, 385 and 405 nm. Two operating modes – flash or continuous radiation – allow for optimal adaptation to different material requirements whilst ensuring uniform curing from all sides.
FAQs: Frequently asked questions about light curing (post-processing)
Why is light curing so important in dental 3D printing?
Light curing is far more than just a post-processing step. During 3D printing, only an initial curing of the resins takes place. It is only the post-curing process that leads to complete polymerisation and, consequently, optimal mechanical properties, maximum biocompatibility and long-term dimensional stability. In dental applications, this step is particularly important for consistently precise results and safety.
What exactly happens during polymerisation?
In photopolymerisation, light triggers a chemical reaction. The photoinitiators contained in the material absorb the light and form free radicals, which initiate the cross-linking of the monomers into polymers. Various factors influence this process: light intensity determines the reaction rate, whilst the wavelength is crucial for the activation of the photoinitiators. Temperature also plays an important role – moderate heating can increase the degree of polymerisation.
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What role do UVA and UVB radiation play?
The different types of UV radiation have varying effects: UVB (280 – 315 nm) is higher in energy and ensures rapid surface curing. UVA (315–380 nm) penetrates deeper into the material and ensures thorough curing. Our equipment utilises both types of radiation in a targeted manner to achieve optimal results. The Otoflash G171 even covers an extended wavelength range up to 580 nm, which is particularly advantageous for pigmented materials.
How can optimum curing be achieved?
The quality of the curing process depends on several factors:
- Proper cleaning of the object to remove any unpolymerised resin
- Suitable wavelengths for the respective material
- Optimised exposure time (usually 6 to 10 minutes)
- Uniform curing from all sides
- Monitoring the ambient temperature
Our equipment is specifically designed to meet these requirements and offers validated programmes for all optiprint resins.
What should you bear in mind when handling the equipment?
Proper handling is crucial for optimum results:
- Thorough cleaning of the objects prior to re-exposure
- Correct positioning within the unit to ensure uniform curing
- Adherence to material-specific exposure times
- Regular maintenance of light sources
- Observe the safety instructions when handling UV radiation
Our detailed application recommendations and technical support are here to help you.