Celtra Duo Zirconia-reinforced Lithium Silicate

A proprietary Zirconia-reinforced Lithium Silicate (ZLS) microstructure makes Celtra Duo (ZLS) the one and only CEREC material that allows complete control over the workflow process without sacrificing the quality of the final restoration.

With crystallites four to eight times smaller than lithium disilicate blocks, Celtra Duo (ZLS) possesses an ultra-fine microstructure that combines high flexural strength with a high glass content, resulting in an impressive strength and beauty profile.

Excellent edge stability

Celtra Duo (ZLS) provides excellent edge stability, resulting in restorations with strong and durable margins that resist chipping.  In testing, standardized copings are cut back at the edges to a wall thickness of 200µm to examine edge stability.

The results speak for themselves.

Natural opalescence

The unique lithium silicate crystalite composition of Celtra Duo (ZLS) with 500-700µm particle size contributes to an opalescence that behaves like natural tooth enamel, creating a lifelike appearance and vitality in the mouth.

Fluorescence and chameleon effect

The high light conductivity and shade adaptation of Celtra DUO (ZLS) in conjunction with the remaining natural teeth and the pronounced opalescence create the desired chameleon effect.  With an inlay, for example, it's virtually impossible to discern where the restoration ends and the natural tooth begins. Likewise, full contour crowns are virtually undetectable among neighboring natural teeth.

High strength and longevity

Celtra Duo (ZLS) retains its high level of strength in long-term chewing simulations. Even after 6,000 thermal cycles (41°F to 131°F) and 1.2 million chewing cycles with 70 Newtons of force, Celtra Duo (ZLS) demonstrated no loss in strength.

Characterization and firing technique

Fired restorations have a flexural strength of 370 MPa.

The induction furnace CEREC SpeedFire by Dentsply Sirona combines the processes of sintering and glazing in one compact, user-friendly device. The CEREC SpeedFire reaches a maximum heating rate of 300 °C per minute – no preheating or holding temperatures are necessary. Its induction technology ensures a perfectly homogeneous temperature distribution. Its dimensions make the CEREC SpeedFire a compact device that fits in any practice.

No firing schedules are required for CEREC SpeedFire. All sintering and glazing processes are completely automated: The CEREC software sends the order with the necessary information to the furnace, eliminating the need for manual programming. 

Before applying the stain and glaze material, remove all dirt and grease from the restoration.

Mix glaze in jar thoroughly with a spatula if separation is seen.

Remove desired amount of Celtra Duo Universal Glaze paste from jar to tray.

If a different consistency is desired, adjust the consistency by diluting the material with Celtra Duo Universal Stain & Glaze Liquid.

Apply a thin layer of glaze material all over the crown surfaces using a staining brush. Make sure not to apply the glaze material either in too thick or too thin of a layer. A thin layer will result in a matte finish. A thick layer can result in a puddling or pooling of a stain.

If customization is needed, take a little of the corresponding body and incisal stains and position it on the tray.

Dilute if needed and apply it to the crown.Before applying the stain and glaze material, remove all dirt and grease from the restoration.

Position crowns directly on the firing pad and fire according to the firing instructions.

When using the CEREC SpeedFire furnace, place the restoration directly on the firing pad. Note that the pad will need to be trimmed to fit.

No special equipment is needed, as Celtra Duo (ZLS) can be fired in standard ovens. However, Celtra Duo (ZLS) has its own unique firing schedule that must be programmed prior to firing.

After the first firing, if the consistency of the glaze was too thin, the restoration may come out under-glazed. If that is the case, apply a thin layer of Celtra Duo (ZLS) overglaze material all over the crown surface using a brush. Once the overglaze is applied, conduct firing procedure according to the Celtra Duo (ZLS) Firing Schedules.