Zirconia Restorations
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The Benefits & Applications of
Katana STML Monolithic Zirconia Restorations

Written by Andrew Sedler

Current zirconia can be classified into three basic generations based on the yttria content.

Full contour zirconia is the most prescribed restoration in dentistry today. It has filled a significant need to address the patient’s demands for metal-free restorations while being budget friendly.

The initial monolithic zirconias were very strong but were not as translucent as many clinicians desired. Zirconia restorations have evolved and improved over the last 11 years. Katana by Noritake is one of the most advanced monolithic zirconias in the dental industry today. The subject of this article will focus most of the details specifically on Katana Super Translucent Multi-Layer (STML), due to its’ favorable benefits in several areas.

Katana STML Monolithic Zirconia Restorations - Benefits

Background of Dental Zirconia

Yttria-stabilized tetragonal zirconia (Y-TZP) has been used in orthopedics to manufacture artificial joints. Y-TZP was found to be highly biocompatible. In addition, Y-TZP is extremely strong and resistance to fracture, with a flexural strength of 900–1400 MPa. When a crack initiates on the surface of Y-TZP zirconia, the stress at the top of the crack causes a transformation in the tetragonal crystal and this transformation leads to compressive stress that inhibits the crack from growing, thus enhancing the fracture toughness.

Background of Zirconia

Current zirconia can be classified into three basic generations based on the yttria content.

Katana Strength Comparison Chart

Noritake Katana Strength and Translucency

Katana has three (3) distinct strength and translucency options:

Translucency comparison of Katana to e.max
Left to Right: Katana HT/ML, Katana STML, e.max LT, e.max MT

Application for Katana Family Zirconias

UTML - Inlay & Onlays, anterior crowns, Posterior crowns

Attributes of Katana STML Monolithic Zirconia

Katana STML Monolithic zirconia is the best balance of strength and esthetics. As stated, the focus of this article is specifically on Katana STML restorations. STML is a multi-layered material that is pre-colorized in the puck, so the color is through and through the restoration, not just in the surface layers. Burbank Dental Lab has found that STML has a very favorable balance of strength and translucency. STML actually is virtually identical in translucency with e.max LT, with a thickness of 1.5 mm.

Cementation & Bonding

The cementation protocols for zirconia restorations are similar to those used when cementing gold crowns. Since zirconia restorations are not etchable, It is important to create resistance and retention form in the preparation. Because zirconia cementation uses a traditional cementation procedure, there are many cementation material options. While it is possible to use several categories of cement product types, glass ionomers and resin-modified glass ionomers are the most commonly used types of cement.

The Katana family of zirconia has something for every application that can be filled with zirconia restorations. Katana STML specifically is fast becoming one of the go-to restorations for Burbank Dental Lab because it is a nearly perfect balance of cosmetics, strength, and is one of our best value restorations.

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Burbank Dental Lab has three new state-of-the-art Carbon M2 printers. We are very excited about the options that these cutting-edge printers will allow us to offer our dental clients. Here are some of the advantages that these printers will begin to deliver to you and your dental practice.

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Fabrication
of the future
is here!

Burbank Dental Lab has three new state-of-the-art Carbon M2 printers. We are very excited about the options that these cutting-edge printers will allow us to offer our dental clients. Here are some of the advantages that these printers will begin to deliver to you and your dental practice.

Our New
State-Of-The-Art
3d Printers

Carbon offers a highly dependable 3D manufacturing solution for many dental applications with its breakthrough Digital Light Synthesis™ technology, enabled by a wide range of dental materials.