What is sintered zirconia?
During the production of high-tech ceramics, a ceramic powder is mixed with a binder and pressed to a green body. By thermal treatment the binder is removed (burned out) and the ceramic is sintered to the final part.
How much does zirconia shrink when sintered?
The zirconia restoration needs to be designed in an enlarged dimension prior to the milling process, in order to compensate for linear sintering shrinkage of zirconia by approximately 15–30% (16).
What is pre sintered zirconia?
The pre-sintered Zirconia is milled, when the material still has a soft, chalk-like consistency. For full density, it is sintered again after milling. HIP material is milled in the fully sintered state. This sheet describes the differences of pre-sintered Zirconia.
How long does it take to sinter zirconia?
Total sintering time 60 min. Super-speed sintering (SS): Crown is placed in a pre-heated furnace at 1580 °C, dwelling for 10 min, and immediately removed from the furnace. Total sintering time 10 min.
What is sintering in dentistry?
Dental sintering furnaces are used to process dental zirconia after it has been milled into a crown, bridge, framework or other restoration. These furnaces are capable of reaching the extremely high temperatures required to sinter zirconia to its final hardness.
What is Green State zirconia?
The GS Green State Contour™ System provides a variety of instruments that offer a safe and efficient way to remove sprue connectors and contour your pre sintered zirconia restorations. Sprue Connector Removal.
What is pre sintered?
Presintering is heating this green compact to prepare the powder shape by burning off the binder or starting the sinter process without binder for strength while handling the object.
Is zirconia grinding or milling?
However, the diamond burs (ex. 12, 12s, 20) actually use a grinding process to grind away the block material. The carbide and zirconia burs (Shaper 25rz, Shaper 25, finisher 10) use a literal milling process to cut and slice the material.