Direct printing of aligners requires detailed integration of aligner specifications and control of the overall workflow and process variables (software, aligner thickness, resin design, printer specifications such as power, wavelength, printing settings, includoing exposure time, z layer thickness, postcuring and cleansing settings and protocols, types of cleaning fluids used, cleaning time and temperature, light power, wavelength and temperature during postcuring, etc.

All the mentioned variables affect and determine the final aligner mechanical properties, their clarity and biocompatibility, such as  its hardness, rigidity, stress relaxation resistance during usage, color, overall resistance, durability, and safety.

Different printers and printing settings and specifications, cleaning, postcuring, and post processing protocols etc, affect significantly the overall quality and performance properties for any 3D printed photoreactive resin.