A coating composition and a dental structure are described. The coating composition can include an acidic copolymer having acidic acrylate monomeric units, acidic methacrylate monomeric units, or a combination thereof； a solvent having ethanol and water； and a pigment. The coating composition can comprise two phases and the wt- % of each component is based on the total weight of the composition. The dental structure can include a dental article, and a film on a surface of the dental article, wherein the film is formed by drying the coating composition on the dental article. A method for generating contrast for oral scanning on a dental structure and a method for scanning a dental structure are described.
