Relative color stability of ceramic stains subjected to glazing temperatures

Ceramic stains are routinely used to modify Hue or characterize ceramic dental restorations. Subjective opinion has led to the hypothesis that certain stains are not color stable when subjected to glazing temperatures. This study tested the individual stains in nine different ceramic staining kits for color stability when subjected to glazing temperatures. Ceramic disks were made with gingival porcelain and coated with individual stains. Colorimetric recordings were made before and after glazing and the color difference (delta E) was calculated. Significant color changes were noted for specific individual stains from each of the ceramic staining kits tested.