Patent ID: 11958970
Assignee: TOKUYAMA DENTAL CORPORATION
Field: Pharmaceuticals (Chemistry)
Classification: CPC A  C  Y | IPC A  C

Claim 0:
1. A resin block for dental cutting work comprising a resin matrix (A) and a spherical filler (B) whose average particle size falls within a range of 230 nm to 1000 nm,
wherein the resin block for dental cutting work further comprises inorganic particles (C) having an average particle size of less than 100 nm, and wherein an amount of the inorganic particles (C) is 0.1 to 30 parts by mass relative to 100 parts by mass of the resin matrix (A),
wherein the resin block for dental cutting work is such that, when having a thickness of 10 mm and measured with a colorimeter, the lightness (V) is less than 5.0 and the saturation (C) is less than 2.0 as measured values in a Munsell color system of a colored light on a black background and a white background, and is such that, when having a thickness of 1 mm and as measured with a colorimeter, the lightness (V) is less than 5.0 and the saturation (C) is 0.05 or more as measured values in a Munsell color system of the colored light on a black background, but on a white background, the lightness (V) is 6.0 or more and the saturation (C) is less than 2.0 as measured values in a Munsell color system of the colored light, wherein 90% or more of the individual particles constituting the spherical filler (B) are present within a range of the average particle size ±5%, and the resin matrix (A) and the spherical filler (B) each are selected so as to satisfy a requirement (X1) represented by the following expression (1):

nP<nF  (1)

where nP represents a refractive index of the resin matrix (A) at 25° C., and nF represents a refractive index of the spherical filler (B) at 25° C.