Dental mill blank with intermediate color layer at 30% position

A dental mill blank including three or more layers which are stacked on each other, wherein

• in a case in which a chromaticity of each layer based on a L*a*b* colorimetric system is expressed by √(L*2×a*2×b*2), a layer which has the highest chromaticity is defined as a W layer, wherein chromaticities in the W layer based on the L*a*b* colorimetric system are expressed by WL, Wa, and Wb, and a layer which has the lowest chromaticity is defined as a D layer, wherein chromaticities in the D layer based on the L*a*b* colorimetric system are expressed by DL, Da, and Db,
• the W layer and the D layer are respectively disposed on opposed surface layers of the dental mill blank,
• a color of a 30% position layer, wherein chromaticities in the 30% position layer based on the L*a*b* colorimetric system are expressed by 30% position L, 30% position a, and 30% position b, which includes a position spaced from a surface of the dental mill blank of a W layer-side by 30% of a dimension between the surface of the dental mill blank of a W layer-side and a surface of the dental mill blank of a D layer-side, wherein when a boundary of the layers is positioned at the position spaced from the surface of the dental mill blank of the W layer-side by 30%, wherein the 30% position layer includes a position exceeding the position spaced from the surface of the dental mill blank of the W layer-side by 30% satisfies the following relations:
• 30% position L is within a range of ((WL+DL)/2)×(0.90 to 1.10),
• 30% position a is within a range of ((Wa+Da)/2)×(0.90 to 1.10), and
• 30% position b is within a range of((Wb+Db)/2)×(0.90 to 1.10),
• a contrast ratio of the D layer is within a range of 0.55 to 0.95, and
• a contrast ratio of the 30% position layer is within a range of the contrast ratio of the D layer×(0.70 to 1.00).