1. Furthermore, the varying processes by which dental zirconia powders are formed into milling zirconia blocks significantly influences the quality of the final product. Unidirectional axial pressing creates a milling zirconia block shape that is very precise but lacks material consistency and therefore is not ideal for larger restorations.
2. On the other hand, cold isostatic pressing (CIP) uses a liquid medium, like water, to apply pressure uniformly in all directions to the zirconia powder enclosed in a mold to maintain its shape
3. The very high pressures involved with CIP minimize and remove voids in the powder to increase material density and produce a green-state (unsintered) zirconia block with excellent homogeneity throughout the entire material. The green-state zirconia block is then pre-sintered to allow it to be easily milled and post-processed by the technician. The final production step involves sintering the zirconia at very high temperatures (1350°C to 1500°C) whereby the final restoration hardens and shrinks linearly by 20% to 25% to achieve the desired strength and optical properties.
The first generations of high-strength CIP zirconia milling materials resulted in monochromatic and densely opaque restorations that exhibited limited esthetics unless layered. However, over the past 5 years, newer iterations of zirconia block materials have evolved into milling zirconia blocks that are trending toward ever higher translucency and pre-shaded zirconia block or multilayer zirconia blocks that greatly increase the esthetic outcome while reducing production processes. A great benefit to these high-translucency materials is that they require less reduction than monolithic glass-ceramic restorations and are kinder to natural opposing dentition.
In the past year, new formulations of zirconia milling blocks have included those that can be sintered in as few as 2 hours. As the top three zirconia block manufacturer in china, Yucera’s zirconia block fully reach this requirement with above production process, which can be fast sintered in 2 hours for some urgent case, below 3 units zirconia crown. Preshaded zirconia block and multilayer zirconia block efficiently save dental technician’s time to dying colors, ideal for large-span restorations.
Where to buy dental zirconia block? Absolutely Yucera, welcome contact us.
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