US 12,304,873 B2
Functionalized ceramic article
Zoe Koelbing, Basel (CH); Philippe Chavanne, Holstein (CH); Sven Simeunovic, Winterthur (CH); and Marc Stephan, Lorrach (DE)
Assigned to INSTITUT STRAUMANN AG, Basel (CH)
Appl. No. 17/784,402
Filed by INSTITUT STRAUMANN AG, Basel (CH)
PCT Filed Nov. 13, 2020, PCT No. PCT/EP2020/082132
§ 371(c)(1), (2) Date Dec. 5, 2022,
PCT Pub. No. WO2021/115727, PCT Pub. Date Jun. 17, 2021.
Claims priority of application No. 19215987 (EP), filed on Dec. 13, 2019.
Prior Publication US 2023/0131023 A1, Apr. 27, 2023
Int. Cl. B29C 67/00 (2017.01); A61C 13/00 (2006.01); A61C 13/08 (2006.01); A61C 13/083 (2006.01); A61K 6/802 (2020.01); A61K 6/818 (2020.01); A61K 6/82 (2020.01); A61K 6/824 (2020.01); B28B 1/00 (2006.01); B33Y 10/00 (2015.01); B33Y 70/00 (2020.01); B33Y 80/00 (2015.01); C04B 35/626 (2006.01); C04B 35/64 (2006.01); C04B 41/00 (2006.01); C04B 41/45 (2006.01); C04B 41/50 (2006.01); C04B 41/86 (2006.01)
CPC C04B 41/4578 (2013.01) [A61C 13/0019 (2013.01); A61C 13/0022 (2013.01); A61C 13/082 (2013.01); A61C 13/083 (2013.01); A61K 6/802 (2020.01); A61K 6/818 (2020.01); A61K 6/82 (2020.01); A61K 6/824 (2020.01); B28B 1/001 (2013.01); B33Y 10/00 (2014.12); B33Y 70/00 (2014.12); B33Y 80/00 (2014.12); C04B 35/6264 (2013.01); C04B 35/64 (2013.01); C04B 41/0072 (2013.01); C04B 41/009 (2013.01); C04B 41/4535 (2013.01); C04B 41/5007 (2013.01); C04B 41/86 (2013.01); C04B 2235/3217 (2013.01); C04B 2235/3225 (2013.01); C04B 2235/3229 (2013.01); C04B 2235/3244 (2013.01); C04B 2235/36 (2013.01); C04B 2235/6026 (2013.01); C04B 2235/661 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A method for additive manufacturing of a position sensitive colored dental ceramic article comprising:
a) providing at least one flowable ceramic component;
b) forming a green body by sequential deposition of the flowable ceramic component provided in step a) and optionally a support material not intended to be part of a final article, wherein the flowable ceramic component is sequentially deposited in the form of particles dispersed in a dispersion medium;
c) position sensitive application of a coloring substance in a solvent to at least a part of a surface of the green body being formed in step b), wherein the coloring substance is applied simultaneously to the sequential deposition;
d) heat treatment or curing of at least a part of the green body surface obtained in step c);
wherein the method steps a)-d) are at least performed once;
e) optionally removing the support material from the green body; and
f) sintering the green body to obtain the ceramic article,
wherein the coloring substance is a dyestuff according to ISO 18451-1:2019 (E); and
wherein the dispersion medium comprises ≥10 wt. % and ≤40 wt. % 2-(2-Butoxyethoxy)ethanol and the dispersed particles comprise ≥30 wt. % and ≤60 wt. % zirconium oxide, ≥0.001 wt. % and ≤3 wt. % hafnium oxide, ≥0.001 wt. % and ≤8% yttrium oxide; or,
wherein the dispersed particles comprise ≥2 wt. % and ≤10 wt. % yttrium oxide, ≥0.001 wt. % and ≤10 wt. % hafnium oxide, ≥0.001 wt. % and ≤3 wt. % aluminum oxide.