	US 12,226,271 B2
	Coloring solution for zirconia
Yuta Tajima, Aichi (JP)
Assigned to KURARAY NORITAKE DENTAL INC., Kurashiki (JP)
Appl. No. 17/418,407
Filed by KURARAY NORITAKE DENTAL INC., Kurashiki (JP)
PCT Filed Dec. 25, 2019, PCT No. PCT/JP2019/050814 § 371(c)(1), (2) Date Jun. 25, 2021, PCT Pub. No. WO2020/138163, PCT Pub. Date Jul. 2, 2020.
Claims priority of application No. 2018-243476 (JP), filed on Dec. 26, 2018.
Prior Publication US 2022/0061967 A1, Mar. 3, 2022
Int. Cl. A61C 13/08 (2006.01); A61C 7/14 (2006.01); A61C 8/00 (2006.01); A61C 13/00 (2006.01); A61C 13/083 (2006.01); C04B 41/00 (2006.01); C04B 41/45 (2006.01); C04B 41/82 (2006.01)

CPC A61C 13/082 (2013.01) [A61C 13/083 (2013.01); C04B 41/009 (2013.01); C04B 41/4535 (2013.01); C04B 41/4578 (2013.01); C04B 41/82 (2013.01); A61C 7/14 (2013.01); A61C 8/0012 (2013.01); A61C 13/0006 (2013.01); A61C 13/0022 (2013.01); C04B 2235/3244 (2013.01); C04B 2235/9661 (2013.01)]

20 Claims

1. A coloring solution, comprising:

(A) a coloring agent that is decolorized after firing of zirconia; and

(B) a metal ion solution comprises a coloring cation,

wherein the coloring cation comprises Al, K, Na, and/or Ni, in ionic form, and

wherein, when zirconia is colored with the coloring solution and then subjected to firing, the color difference of the zirconia before and after the firing satisfies ΔL*≤5.8, Δa*≤2.4, and Δb*≤4.3.