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To clarify the color of porcelain fused to metal crowns, we examined opaque porcelain baked on a metal base using a color and color difference meter. The following types of materials were used in fabricating the samples:(1) 84.3% Au-Pt-Pd-Ag alloy, (2) 81.9% Pd-Cu-Ga alloy, (3) 77.0% Ni-Cr alloy, (4) Brown opaque porcelains; A10, A20, A30, A40, (5) Grey opaque porcelains; C1O, C20, C30, C40, (6) Red opaque porcelains; D20, D30 and D40. The masking effect on the color of the metal base was examined.The following results were obtained.1. The color of the opaque porcelain fused to the metal was affected by all opaque porcelain colors having 0.10-0.20 mm thick opaque porcelain layer. The masking effect on the color of the metal was as follows; In case of light color opaque porcelain, D group colors were the highest, followed by C group colors, with A group colors being the lowest. In case of dark color opaque porcelain, C group colors were highest, followed by A group colors, with D group colors being the lowest. Opaque layers thicker than 0.25 mm were not affected by the opaque porcelain colors.2. The color of opaque porcelain fused to the metal was affected by all metal colors for 0.10-0.20 mm thick opaque porcelain layers. The masking effect on the color of the metal base was as follows; Au-Pt-Pd-Ag alloy was the highest, followed by Ni-Cr alloy, with PdCu-Ga alloy being the lowest. Opaque layers thicker than 0.25 mm were not affected by the metal colors.

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A colorimetric study on the opaque porcelain of porcelain fused to metal crowns. Part II. Hiding effect on the color of metal base in case of the brown, the grey and the red color opaque porcelain.