[Colorimetric study of color reproduction in porcelain-fused-to-metal restoration. The application of Kubelka-Munk theory in porcelain mixtures].
To get a more natural and harmonious color of porcelain-fused-to-metal restorations, an objective and precise systematic method from shade selection to color evaluation is needed. Thus, the absorption and scattering coefficients were determined to develop a CCM system for porcelain-fused-to-metal restorations. The Kubelka-Munk Theory was applied on the dental porcelain, opaque, dentin, and enamel. From these data, we predicted the color of the porcelain mixtures from the both coefficients. From the results of comparing the spectral curves and analyzing the color differences between measured values and predicted values of porcelain mixtures, the following was analysed; 1. In opaque, spectral curves of the predicted and measured values were exactly alike and the mean dE between two values was 0.39. 2. In dentin, the spectral curved of the predicted and measured values were exactly alike, and the mean dE was 1.13. The measured values indicated a slight increase in the level of chroma and lightness. 3. In enamel, the spectral curves were exactly alike and the mean dE was 1.16. The measured values indicated a slight decrease in the level of lightness. Therefore, it was possible to predict the color of opaque, dentin and enamel porcelain mixtures, by applying the Kubelka-Munk Theory.
Ishikawa
S
S
Dept. of Fixed Prosthodontics, School of Dentistry, Iwate Medical University.
Miyoshi
F
F
Ishibashi
K
K
D000269:Adhesives; D017438:Bisphenol A-Glycidyl Methacrylate; D003116:Color / Q000592:standards*; D003124:Colorimetry; D003743:Dental Enamel; D003776:Dental Porcelain; D003804:Dentin; D004955:Esthetics, Dental; D016876:Metal Ceramic Alloys
D000269:Adhesives; D016876:Metal Ceramic Alloys; D003776:Dental Porcelain; D017438:Bisphenol A-Glycidyl Methacrylate