FAQs

The existing KATANA™ Zirconia multi-layer materials (KATANA™ Zirconia UTML/ STML/HTML) have a color gradation, while the base material of the respective type is the same for all layers and, besides, the strength and translucency are the same for all layers of the respective type. KATANA™ Zirconia YML is different in this regard. It is the latest KATANA™ multi-layer disc with a balanced combination of color/translucency and flexural strength gradation. Each series has the following mechanical properties and translucency levels: Please refer to the inserted charts.

"All-In-One" means all application range with one disc. KATANA™ Zirconia YML is characterized by a unique raw material combination of highly translucent zirconia with high strength, which are integrated together by an advanced manufacturing technology. As a “All-IN-ONE Solution" KATANA™ Zirconia YML offers exceptional design flexibility from long-span full-arch monolithic bridge restorations up to highly aesthetic anterior monolithic crown restorations.

From complicated full-arch restorations to highly aesthetic demanding anterior single-unit restorations, an exceptional design flexibility is available. In each of these cases, you can choose a monolithic, cut-back or framework design with the appropriate fabrication process, depending on your specific needs.

KATANA™ Zirconia is characterized by the unique in-house production of zirconia raw materials: By using materials that Kuraray Noritake Dental has developed by themselves specifically for KATANA™ Zirconia, completely different from those of other competitors, it is possible to realize high-speed sintering without compromising the aesthetic and mechanical properties.

KATANA™ Zirconia YML is available in a shade selection of 14 shades, which are adapted to the VITA-classical A1-D4™ Shade Guide.  Please refer to the following table overview for more information about shape and disc-thickness.

Please observe the following guidelines of applicable minimum wall thickness:

The thickness specifications apply to full zirconia restorations. The thickness of build-up porcelain is not included. The minimum wall thicknesses apply to full zirconia restoration or to frame-work for build-up porcelain restoration. In these cases, 0.4 mm (anterior) or 0.5 mm (posterior) should be kept for the area located in the bottom (lower) half of the disc. If full zirconia veneer restoration is used for combination with the porcelain, 0.8 mm or more should be kept for the area located in the upper half of the disc.

Please observe the following of sintering schedule:

The above sintering recommendations represent only a guideline; depending on each individual furnace and condition, some adjustments might be necessary. If the 54 or 90-minute sintering program is not programmable in your furnace, it is not possible to set the furnace according to one of these schedules.

No, this is not possible. 54- or 90-minute sintering is only possible up to a three-unit bridge restoration.

The body layer has a higher content of tetragonal crystals, while the cubic content gradually increases towards the enamel layer.

KATANA™ Zirconia YML can be finalized by glazing, staining or porcelain application. With an integrated translucency, color and strength gradient, KATANA™ Zirconia YML is designed to achieve highly aesthetic results by simply using the glazing technique. In case of additional color adjustments, characterizations or individualizations are desired, the unique CERABIEN™ ZR FC Paste Stain can be used to achieve the final high aesthetic result according to your preferences.

Of course, this is possible. For this purpose, the desired high-polished finishing can easily be achieved with the PEARL SURFACE™ Z (polishing paste).
Please note that the shade of KATANA™ Zirconia YML should be pre-set for glazing, due to the fact that zirconia has a tendency to become darker during the polishing process. Therefore, select in advance one shade lighter than the target shade.

It is generally not recommended to wet-mill KATANA™  Zirconia, because the desired esthetic effect may not be achieved due to the possibility of contamination, which can reduce the translucency.

If a restoration is contaminated before sintering, it will cause white spots on the restoration during the sintering process. Causes for this are for example oily fingers, excessive purging with high air pressure, residuals of silicon point substance that has been applied to the pre-sintered zirconia during adjustment procedures, the use of scanning spray, or the insufficient removal of zirconia powder that has been created during the milling process/removal of sprue. Please take care not to contaminate the restoration.

This is not recommended, as the desired level of translucency or color development cannot be achieved.

The sintering parameters differ from other manufacturers' zirconia products. The maximum sintering temperature for the 54-minute program is 1600°C (2912°F), for the 90-minute program 1560°C (2840°F) and for the 7-hour program 1550℃ (2822°F).

*The material is removed from the furnace at 800°C. High-speed sintering is possible for up to three-unit bridge restorations.

Any sintering furnace capable of setting the KATANA™ Zirconia YML sintering program according to its technical specifications can be used, regardless of the manufacturer. If the KATANA™ Zirconia YML sintering program is not programmable in your sintering furnace, it is unfortunately not possible to set the furnace according to this schedule.

Yes, this is possible using several options in your CAD/CAM software. These options allow the designer to change the restoration position within the disc profile to achieve the best gradation map for the restoration. Please refer to our "Handy Chart" as a guideline for this.

When placing the disc in the milling unit, how is it possible to identify the right side from the wrong side of KATANA™ Zirconia disc?

The sintering schedules for KATANA™ Zirconia YML, HTML PLUS, UTML, and STML are unified for both short-time and regular firing. UTML and STML can be fired with either the new or old firing schedule, while YML and HTML PLUS cannot be fired with the old firing schedule.

The 26 mm is mainly intended for thick and large cases and are designed with a longer body layer to fabricate the gingival portion.

Not lined up at this time.

EW0/NW/A1/A2/B1/C1/D2 are available.

Firing can be performed according to the sintering schedule described in the instructions for use.

Use a sintering furnace that has been properly maintained. If the restoration is dirty, it may affect the coloring after firing. Please be very careful not to contaminate the restoration during fabrication. Examples of factors that may cause corrupting of the restoration include: dirty hands when working, excessive cleaning of the restoration at high air pressure, dust from the silicon tip adhering to the zirconia before sintering, use of scanning sprays, and zirconia dust generated during cutting or sprue removal that has not been sufficiently removed.