Dental News - Celtra Press – Makes the difference

Dentsply Sirona

Tue. 22. August 2017

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The new generation of high strength glass-ceramic, zirconia-reinforced lithium silicate (ZLS), is now available in a pressable version.

Celtra Press is the new class of zirconia-reinforced lithium silicate material available to labs for pressing. This unique material provides top aesthetics and is virtually impossible to tell apart from a natural tooth.

Dentsply Sirona has been supplying Celtra Duo zirconia-reinforced lithium silicate, in the form of CAD/CAM blocks for CEREC and inLab machines, since 2013. Celtra Duo can be processed with two alternative methods. The first method follows CAM processing or milling and only requires one single polishing stage before final placement. This method offers a restoration of around 210 MPa in just 15 minutes. Alternatively, the material can be stain/glaze fired to achieve the strength of lithium disilicate (370 MPa). Each method can be selected according to the indication and desired strength of the restoration, providing flexibility and speed.

The launch of Celtra Press now allows laboratories to benefit from the unique microstructure of ZLS in the traditional pressing procedure.

With its strength in excess of 500 MPa, Celtra Press creates a new benchmark in the high strength glass-ceramics segment. The 10 percent zirconium oxide (already dissolved in the glass matrix) and the power firing (which in the case of monolithic restorations, forms part of the stain/glaze firing), provides this exceptionally high strength. Owing to the good surface texture, intraoral polishing is possible.

In addition to its high strength, Celtra Press creates unmatched aesthetics. The high glass content and fine crystalline structure provides outstanding light-optical properties. Thanks to this combination of high translucency and opalescence, Celtra Press exhibits an amazingly natural chameleon effect which allows restorations to blend into the natural dentition extremely well.
During the development of Celtra Press, a great deal of attention was paid to ensure an exact match to the VITA shade system for excellent shade accuracy and reproduction. The HT, MT and LT translucency shades are closely matched and permits users to reliably reproduce the desired degree of translucency. Celtra Ceram veneering porcelain is available to labs for additional customisation.

When used with the specially developed Celtra Press Investment, only a minimal reaction layer forms during pressing which is already sandblasted off during devesting. Further pickling in acid or sandblasting is no longer required. Thanks to the precision of fit, fine and homogenous surfaces as well as “soft” devesting properties, users can work quickly and reliably.

The low viscosity of Celtra Press provides optimum flow properties so that only one pressing sprue needs to be attached. This is applicable for the entire indication spectrum including up to three-unit bridgework on second bicuspids in the anterior region. Even the most delicate of structures and restoration margins are reproduced accurately.

For more information, please contact your local Dentsply Sirona representative, or for background details on the press version of zirconia-reinforced lithium silicate please visit www.celtra-dentsplysirona.com

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