Zirconia as a dental ceramic is a synthetic material which exists in three different crystal structures. The polymorph materials’ phases change depending ont he temperature and pressure. This transformation phenomenon is reversible. The most stable crystal structures exist in higher temperatures only. Cooling leads to furrher stress in the crystal structure of the sintered ceramincs which results and promote fracture and cracks. To avoid the rigidity, it needs stabilizing componenets like yttria (Y2O3) or other rare-earth oxides. By adding these substitutes tot he zirconia, the result is partially or fully stabilized crystal structure. Due to this „little chemical spell” ceramics with remarkable mechanical and chemical properties could be created.
HOW IT'S MADE?!
First of all, fine and pure raw material powders are essential to produce dental ceramics.
The manufacturing TECHNOLOGY is the key to achieve the uniquw structure of the zirconia ceramic. KEROX Ltd. uses conventional ceramic technology for the preparation of ZIRCOSTAR® pre-sintered zirconia blanks for CAD/CAM dental applications.
THE MANUFACTURING TECHNOLOGY CONSISTS OF THE FOLLOWING WELL-HARMONIZED MAIN STEPS
axial pressing & cold isostatic
SCHEMATIC REPRESENTATION OF SINTERING MECHANISM
Final Sintering In Your Lab
By perfecting the right combination of raw materials, particle sizes, pressing protocols and sintering curves, KEROX has mastered the are of producing premium dental zirconia.
This refines technology is optimized for the highest quality raw materials and helps us to achieve the most durable and aesthetic dental ceramic materials. The pre-sintered ZIRCOSTAR® zirconia blanks are tested in our CAD/CAM milling laboratory to deliver the best quality to technician experts. Easy machinability, crack- and chipping less workpieces can be ensured by the usage of homogenous ZIRCOSTAR® pre-sintered zirconia blanks. KEROX evaluates and calculates the shrinkage factor in case of every single product individually for the predictable preparation and final sintering processes. ZIRCOSTAR® subtypes were developed to achieve the best result with the combination of excellent mechanical properties with lifelike aesthetic in every solution.