Digital Workflow for Rehabilitation of Severely Discolored Teeth Due to Red Staining from Endodontic Material.

The aim of this article is to present a technique to rehabilitate severely discolored teeth with CAD/CAM zirconia crowns. After confirming the absence of periapical lesions and the presence of sufficient crown structure, any caries or fractured restorations can be removed and replaced with an interim composite restoration. A shoulder subgingival preparation is performed and scanned with an intraoral scanner to design a CAD/CAM zirconia crown using a monolithic zirconia material. This crown is highly polished using a specific polishing kit but not glazed. This technique is suggested to be useful in cases of dark discolored teeth due to staining endodontic materials such as resorcinol-formaldehyde resin.