Colour stability of 3D-printed resin orthodontic brackets.

To evaluate the colour stability of polymeric resins that could be used to 3D-print orthodontic brackets. In vitro, laboratory study. Disc-shaped specimens were fabricated via 3D printing using three resins: Dental LT; Dental SG; and Clear. Five conditions were evaluated for each resin (n = 10 per treatment per resin) to assess its corresponding effect on colour and translucency: immersion in (1) red wine, (2) coffee, (3) tea and (4) distilled water (control), and (5) exposure to accelerated aging. Colour and translucency measurements were made before and after exposure using a spectrophotometer. Mean colour differences (ΔE Statistically significant effects of the resin material, the treatment condition and interactions effects of material and condition were observed for ΔE The colour changes of the resins investigated does not support their use in 3D-printed aesthetic bracket applications.