The Effects of Beverages and Surface Treatments on the Color Stability of 3D-Printed Interim Restorations.

3D-printed interim restorations showed significant discoloration after 6-months immersions in the artificial saliva and common beverages (including tea, coffee, and wine). Among all the chromogenic beverages, red wine caused the most significant discoloration on the interim restorations. When 3D-printed interim restorations are needed for extended intraoral service, nano-filled, light polymerizing protective coating can reduce the restoration discoloration caused by chromogenic beverages. The protective effect is most significant against coffee.