Blank comprised of a zirconium oxide ceramic with an oxide additive and the use thereof

A method for preparing a blank comprising zirconium oxide-based ceramic, said method comprising the steps of:

• (1) preparing a powder or granules containing:
• (A) at least 91 wt.-% zirconium oxide,
• (B) 0 to 3.5 wt.-% hafnium oxide,
• (C) 1.5 to 6.0 wt.-% yttrium oxide,
• (D) 0.15 to 0.50 wt.-% of at least one of the oxides of the elements aluminum, gallium, germanium, and indium,
• (E) 0.2 to 1.5 wt.-% coloring additives, selected from the group consisting of the oxides Fe2O3, Er2O3 and MnO2,
• wherein in which the wt.-% must add up to 100,
• (2) molding the granules or powder by applying pressure to produce preforms,
• (3) treating the performs With heat to produce the blank.

A denture having a structure wherein at least a portion of the structure comprises a zirconium oxide-based ceramic, containing:

• (A) at least 91 wt.-% zirconium oxide,
• (B) 0 to 3.5 wt.-% hafnium oxide,
• (C) 1.5 to 6.0 wt.-% yttrium oxide,
• (D) 0.15 to 0.50 wt.-% of at least one of the oxides of the elements aluminum, gallium, germanium, and indium,
• (F) 0.2 to 1.5 wt.-% coloring additives, selected from the group consisting of the oxides Fe2O3, Er2O3 and MnO2,
• wherein the wt.-% must add up to 100.