Zirconia-based Oral All-ceramic Restoration Materials

Zirconia ceramics have been focused as one of the best candidate materials for all porcelain restoration and fixed partial denture by computer aided design and computer aided manufacturing(CAD/CAM), because of their excellent mechanical properties, hydrothermal phase stability, and biocompatibility. However, Zirconia ceramic is too hard to machined by CAD/CAM. This study is conducted to synthesize the CePO4/TZ-3YB-E ceramics, which is beneficial to the CAD/CAM of porcelain restorations.In this article, research on CePO4 coated TZ-3YB-E and the effect of Ce3+ Concentrati- on,pH values,bathing temperatures and calcining temperatures on the coating results were studied. The morphology and phase form of reaction products and coating results were investi- gated by TEM,SEM and XRD.The powers were first dry pressed in mould under pressure of 2 MPa, then cold isostatic pressed under pressure of 200 MPa and then the green bodies were sin- tered separately at 1300℃～1600℃.At last,the mechanical and machinable properties were measured.The experimental results showed that using precipitation processing method , the CePO4 could be coated on ZrO2 powders at 50℃. After calcination at 1000℃, t-ZrO2 and m-CePO4 could be obtained.Then were pressed through dry and cold isostatic pressing, sintered at 1000℃. By the comparison of the mechanical and machinable properties before and after coated,we could conclude that the CePO4/TZ-3YB-E ceramic after coated has m- uch better machinable property .But the material has good machinability as well as maintaining outstanding mechan- ical properties. The material has good machinability as well as maintaining outstanding mech- anical properties.