Discoloration of various CAD/CAM blocks after immersion in coffee

Abstract

The Δ<i>E</i>s of CAD/CAM blocks after immersion in coffee varied among products and were comparable to those of restorative composite resins. The discoloration of CAD/CAM composite resin blocks could be effectively removed with prophylaxis paste polishing, while that of some restorative composites could not be removed.