Hybrid resin blank for dental milling, and method for fabricating crown

A hybrid resin blank for dental milling, the hybrid resin blank comprising:

• a monolayer- or multilayer-structure workpiece portion comprising a layer of a colorant-containing structural color hybrid resin comprising:
• a resin matrix of a structural color hybrid resin containing dispersed inorganic particles and exhibiting a structural color with a specific color tone;
• and a colorant including one or more coloring materials and dispersed in the resin matrix,
• the colorant-containing structural color hybrid resin containing 800 to 8,000 ppm by mass of the colorant based on the total mass of the colorant-containing structural color hybrid resin, the colorant comprising 70 mass % or more of a similarly chromatic coloring material, as determined by the following manner:
• in a spectral reflectance curve of the colorant-free structural color hybrid resin obtained by measuring a 3 mm-thick sample of the colorant-free structural color hybrid resin on a black background with a colorimeter, in which a horizontal axis represents reflected light wavelength (nm) and a vertical axis represents reflectance (%), a wavelength at which a maximum reflectance derived from the structural color occurs is defined as a structural color wavelength and a wavelength region in which 85% or more of the maximum reflectance occurs is defined as a wavelength region A;
• and
• in spectral reflectance curve of a coloring material, of the one or more coloring materials, obtained by measurement on a black background with a colorimeter, a wavelength at which a maximum reflectance occurs is defined as a coloring wavelength of the coloring material, a coloring material, of the one or more coloring materials, whose coloring wavelength exists in the wavelength region A is defined as a similarly chromatic coloring material, and a coloring material, of the one or more coloring materials, whose coloring wavelength exists outside the wavelength region A is defined as a differently chromatic coloring material.