Dental material or product and method of forming a dental product
AssigneeChemichl AG
InventorsGerhard Meyer, Thomas Conrad
Life of this patent
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Abstract
The disclosure relates to metal oxide powders with a bimodal particle size distribution, to ceramics that can be made from these metal oxide powders, especially milling ceramics for use in dental technology, to a method for the production of the metal oxide powders and of the ceramics, to the use of nanoscale metal oxide powders for the production of the metal oxide powders and of the ceramics as well as to dental ceramic products.
Claims16
A ceramic or dental material or dental product comprising a ceramic, having a bimodal particle size distribution, whereby a first phase comprises a metal oxide having an average particle size of at least 250 nm, and a second phase comprises a metal oxide having an average particle size in a range of 25 nm to 250 nm;
- made from a bimodal metal oxide powder comprising (a) a first metal oxide powder, and (b) a second, nanoscale metal oxide powder;
- wherein the first metal oxide powder has a d50 value in a range of 0.2 μm to 12 μm, and the second nanoscale metal oxide powder (b) has a d50 value in a range of 10 nm to 200 nm;
- wherein the size ratio of the d50 values of (a) to (b) lies at a maximum of 40 to 1;
- wherein the quantity ratio of (a) to (b) is in a range of 0.1:99.9 to 99.9:0.1;
- and wherein the metal oxide is selected from one member of the group consisting of ZrO2, HfO2, TiO2, and Al2O3, undoped or optionally doped with one or more dopants selected from the group consisting of CeO2, CaO, MgO, Sc2O3, and Y2O3.
Dependencies are inferred from the claim text.