Patent ID: 7608552
Filing Date: 2009-10-27
Classification: A61K,B82Y,C04B

Abstract:
1. 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 d 50 value in a range of 0.2 μm to 12 μm, and the second nanoscale metal oxide powder (b) has a d 50 value in a range of 10 nm to 200 nm; wherein the size ratio of the d 50 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 ZrO 2 , HfO 2 , TiO 2 , and Al 2 O 3 , undoped or optionally doped with one or more dopants selected from the group consisting of CeO 2 , CaO, MgO, Sc 2 O 3 , and Y 2 O 3 .