REDEFINING WHAT “UNIVERSAL”  MEANS

When discussing the universal properties of a dental adhesive, most of us probably think of its compatibility with various etching techniques (from self-etch to total-etch) and a wide indication range. After all, universal adhesives are typically used as bonding agents for direct restorations made of light-curing composite, for immediate dentin sealing, for repair procedures and also in the context of indirect restoration placement.

However, in our opinion, there is more to it:

This means it should be compatible with any resin-based composite and self-adhesive resin cement, regardless of the manufacturer.

BREAKING FREE FROM SYSTEM BOUNDARIES

This is not self-evident: For a long time, “staying within the manufacturer’s own system ” has been a key prerequisite for the successful use of dual-cure core build-up materials and self-adhesive resin cements. Manufacturers worldwide have strongly recommended combining components from the same manufacturer and system to provide for chemical compatibility, optimal alignment, and the best possible outcomes. 

CLEARFIL™ Universal Bond Quick 2: FREEDOM AND FLEXIBILITY

With the new CLEARFIL™ Universal Bond Quick 2, this is no longer necessary: The R&D team of Kuraray Noritake Dental Inc. in Japan has developed an adhesive that works well not only with the company’s self-adhesive resin cement PANAVIA™ SA Cement Universal, but also with other manufacturers’ products. The same applies to core build-up materials: Compatibility is no longer limited to CLEARFIL™ DC CORE PLUS, but extends to solutions offered by other companies. Thorough testing has confirmed that it works well – provided each product’s official instructions for use are followed.

ONE ADHESIVE FOR EVERY CHALLENGE

This makes CLEARFIL Universal Bond Quick 2 a truly universal adhesive and, in fact, the only one needed in your dental practice. Interested? Learn more about the product and its innovative features, including its effortless application with no waiting time. 

SMART. STREAMLINED. UNIVERSAL.

At Kuraray Noritake Dental Inc., we understand the demands of modern dental practices. Balancing complex procedures, tight schedules, and patient needs is no easy task. That is why we have been on a relentless journey to streamline, enhance, and refine every step of your work for decades. Our vision is clear: a world where your materials and tools work seamlessly in your hands, where complexity is minimized, and where you are given enough time to focus on what matters most: the individual desires and needs of every single patient. This is the future of dentistry, and together, we’re making it happen.

We invite you to explore our comprehensive Universal Excellence portfolio —  from bonding agent to composites and resin cement. For Smart Streamlined Solutions in your practice.

DENTAL ADVISOR 2026 AWARDS RECOGNISING KURARAY NORITAKE PRODUCTS FOR EXCELLENCE AND RELIABILITY

As clinical demands continue to rise and chairside time becomes increasingly precious, dental professionals are nowadays looking for materials and devices that truly deliver in daily practice – while demanding less of themselves. In this context, efficiency, ease of use and long-term performance have become decisive factors in product selection.

In a market characterized by frequent product introductions and bold claims, however, identifying the most suitable solutions can be challenging. A useful guide to well-founded decisions: Independent evaluations that combine rigorous laboratory testing with real-practice clinical assessments. One of the most trusted institutions offering this kind of evaluations in the Dental Advisor. Once per year, this respected authority in dental product testing publishes its Top & Preferred Product and Research Awards – highlighting those products that stand out not only for innovation, but for proven, consistent performance.

In 2026, several solutions from Kuraray Noritake Dental Inc. were recognized – ranging from a new universal flowable composite to long-established materials that continue to define modern restorative and adhesive dentistry.

A PROMISING BLEND OF CHARACTERISTICS: RESEARCH AWARD WINNERS

According to Dental Advisor, “Companies that receive Research Awards demonstrate a commitment to advancing dental technology and enhancing patient care.” Product properties are tested in the Dental Advisor Biomaterials Research Center to evaluate the scientific performance and identify those materials with the most promising blend of characteristics.

1. CLEARFIL™ Universal Bond Quick 2 (Research Award and Preferred Product)

Launched in 2025, CLEARFIL™ Universal Bond Quick 2 is an enhanced version of the popular multi-mode adhesive CLEARFIL™ Universal Bond Quick. Both stand out due to their minimal application time. Research conducted at the Dental Advisor Biomaterials Research Center demonstrated excellent bond strength to enamel and dentin, even after artificial aging and saliva contamination. The latter indicates a consistent performance even in wet environments like the oral cavity. The in-vitro tests also confirmed a thin film thickness (3-5μm), supporting accurate seating of indirect restorations.

2. CLEARFIL MAJESTY™ ES Flow Universal (Research and Top Product Award)

CLEARFIL MAJESTY™ ES Flow Universal is a highly filled flowable composite launched in 2025. It features submicron fillers (78% by weight) and a simplified universal shade system enabled by light diffusion technology. Independent testing in the Biomaterials Research Center of the Dental Advisor confirmed that it delivers some of the highest strength values in its class, along with excellent radiopacity and great shade matching compared with other universal-shade composites. Designed for efficient placement, its syringes and application tips help minimize voids, a benefit confirmed by radiographic analysis of filled syringes and attached tips after dispensing of material. Viscosity testing reveals that the material offers a low-flow, no-slump consistency that allows precise cusp build-up and detailed anatomical sculpting. While the material is available in two flowabilities (Low and Super Low) in Europe, Super Low  is the variant offered in the United States and tested in the Dental Advisor Biomaterials Research Center.

3. KATANA™ Cleaner

KATANA™ Cleaner became a 2026 Research Award winner without prior clinical evaluation. The universal cleaning agent contains MDP salt, designed to effectively remove contaminants from both restorative materials and tooth structure. Laboratory testing by the Dental Advisor demonstrated that it restores bond strength on saliva-contaminated zirconia and lithium disilicate to optimal levels, with SEM analysis confirming nearly complete surface cleanliness. In its summary of research highlights, the Dental Advisor team stressed that KATANA™ Cleaner is one of the few commercially available cleaners approved for intraoral use.

4. PANAVIA™ Veneer LC (Research Award and Preferred Product)

PANAVIA™ Veneer LC is widely recognised for delivering strong, durable bonding and highly aesthetic outcomes in veneer procedures. Laboratory testing revealed that, when used with the US-recommended components – PANAVIA Veneer LC Paste, CLEARFIL™ Universal Bond Quick and CLEARFIL™ Ceramic Primer Plus – the system maintains a high bond strength even after artificial aging. This performance was consistent across multiple substrates, including enamel, dentin, silica-based ceramics (lithium disilicate) and zirconia. Furthermore, the system outperformed two other leading veneer cements in gloss retention and wear resistance.

TOP PRODUCT AWARD WINNERS

Top Products are “exceptional products [that] have consistently demonstrated their excellence and reliability, earning a lasting place in our publication“. The winners are selected based on laboratory testing and clinical evaluations conducted under real-life conditions: “Our dedicated volunteer evaluators provide unbiased insights from their real-world experiences, ensuring that only the very best receive this prestigious accolade”, as stated on www.dentaladvisor.com.

1. CLEARFIL MAJESTY™ ES Flow

A proven favourite, CLEARFIL MAJESTY™ ES Flow earned a Top Award for the 10^th time(!), reaffirming its position as a leading product in the direct restoratives category (Composite: Highly Filled Flowable). Recognized for its excellent handling, ease of use, and true-to-life aesthetics, it remains a trusted choice for clinicians seeking versatility and consistently high-quality results. Aesthetic properties were highlighted by one of the evaluators as follows: "The material blended so well with the tooth structure that you had to look hard to find the interface." 

2. CLEARFIL MAJESTY™ ES Flow Universal (Research and Top Product Award)

This product not only excels in the laboratory setting, but also in the practice environment. Among the top features highlighted clinically are its ideal, non-slumping consistency, optimised translucency and great blend-in ability supported by light-diffusion technology. The blend-in ability, along with the benefits resulting form the delivery system, are reflected in a comment: “Excellent shade matching and no air bubbles.”

3. CLEARFIL™ SE Protect

CLEARFIL™ SE Protect continues to set the standard among self-etch adhesives, combining antibacterial properties with fluoride release. Backed by a strong history of clinical success, it received a Top Award this year for its outstanding bonding performance and long-term reliability, making it a key component in modern restorative dentistry. An evaluator commented: "The gold standard in bonding to reduce post operative sensitivity."

4. PANAVIA™ SA Cement Universal

Designed for straightforward and dependable self-adhesive cementation, PANAVIA™ SA Cement Universal earned a Top Award for its high-quality bonding to a wide variety of substrates – without the need for additional primers. Its user-friendly handling and predictable outcomes make it a popular choice for clinicians who value both efficiency and performance. Evaluators highlighted its moisture tolerance as well as its "Amazing viscosity, tack cure-ability and very easy cleanup."

5. TEETHMATE™ DESENSITIZER

Awarded a Top Award for the nineth consecutive year, TEETHMATE™ DESENSITIZER continues to stand out for its exceptional effectiveness in managing hypersensitivity. This non-invasive solution remains highly regarded for delivering durable, long-lasting relief from sensitivity. Its long-lasting effect was confirmed in a comment: “At six months, the majority of patients continue to experience marked improvement from their pre-operative sensitivity or no sensitivity at all."

PREFERRED PRODUCT AWARD WINNERS

According to www.dentaladvisor.com, “The Preferred Product Awards highlight those items that not only excel in performance but also resonate with the needs of dental practitioners.“ Products are selected for this award based on clinical evaluations and in-vitro test results, and a preferred feature is always highlighted.

1. CLEARFIL™ Universal Bond Quick 2 (Research Award and Preferred Product)

Apart from winning a Research Award, CLEARFIL™ Universal Bond Quick 2 became a Preferred Product mainly for its rapid working time, enabled by a formulation with a unique blend of proven and new monomers. It allows clinicians to apply the adhesive and begin working instantly – a feature that is very well received by the consultants: "Extremely quick application time that allowed me to get right to work. Every time saving ability is ideal." Film thickness is low and application extraordinarily easy.

2. CLEARFIL™ CERAMIC PRIMER PLUS

The fact that it is a versatile, one-step solution made CLEARFIL™ CERAMIC PRIMER PLUS become a Preferred Product in the category Indirect Restoratives – Universal Primer once again. An evaluator was particularly happy that it is “Easy to use on a variety of materials”.  While highly versatile in application, the product also stands out for delivering exceptional bond strength – especially when applied to silica-based ceramics, zirconia, and composites. Its proven performance has made it a trusted choice among clinicians around the world.

3. PANAVIA™ Veneer LC (Research Award and Preferred Product)

PANAVIA™ Veneer LC’s preferred feature is its excellent handling, as stated by the evaluators. They liked to apply and model it, as it offered the desired combination of flowability, stability, viscosity and non-stickiness. While matching try-in pastes were well-received, one evaluator particularly highlighted the opacity of the white shade: ""

A SHARED FOCUS ON IMPROVING PATIENT CARE

At Kuraray Noritake Dental Inc., innovation is guided by a clear understanding of clinical realities. The awards received in 2026 reflect an ongoing commitment to developing materials that balance scientific excellence with practical usability – supporting predictable outcomes, efficient workflows and improved patient care. As dentistry continues to evolve, the recognition from the Dental Advisor underscores the importance of solutions that stand the test of time. By listening closely to clinicians and investing continuously in research and development, Kuraray Noritake Dental Inc. remains focused on advancing dental science in ways that matter most – supporting dental professionals in their striving for success and for enhancing their patients’ quality of life, every day.

Dentistry is evolving fast, and so are the expectations of patients and dentists. Nowadays, most dental practitioners know that different zirconia variants are available and that there are certain quality standards the selected material should meet to provide for aesthetic, functional and durable outcomes. Consequently, they often demand the use of a specific zirconia variant for their planned restorations.

Due to the widespread use of Tosoh zirconia in the market, however, many of these dentists are only familiar with the Tosoh 3Y / 4Y / 5Y zirconia terminology. This means that when prescribing a specific type of zirconia, they mention the desired yttria concentration. Unfortunately, this can create confusion in communication between dentists and dental laboratories: Not every zirconia brand and variant on the market fits into this Tosoh classification system.

KATANA™ Zirconia discs of Kuraray Noritake Dental Inc. are made of proprietary powders and advanced multi-layered technology developed in-house. The unique performance these blanks deliver cannot be simply described with the aid of the Tosoh system. Instead, we rely on the internationally recognized ISO 6872 classification — a standard that reflects clinical indications and material performance with precision.

WHY THE ISO 6872 CLASSIFICATION MATTERS

Unlike brand-specific powder classifications, ISO 6872 provides a clear, scientific, and globally accepted framework. It ensures that when a dentist prescribes a solution, or a technician selects a material, everyone speaks the same language – based on strength, translucency, and indication range. 

CONCLUSION

KATANA Zirconia is an advanced dental zirconia family that does not fit into standard boxes like 3Y, 4Y, or 5Y. It redefines what zirconia can do – blending beauty and strength with a scientifically validated ISO classification system. By embracing globally defined and accepted ISO 6872, we can contribute to peace of mind and eliminate confusion in the market.

Always follow Information for Use provided with the product and any other relevant local regulations.

A SMARTER GUIDE TO SELECTIVE DENTIN EXCAVATION

The modern approach to restorative dentistry emphasizes tissue preservation and clinical precision. Instead of extensive removal, today’s clinicians aim to conserve as much sound and remineralizable dentin as possible.

Caries Detector provides a simple yet effective way to achieve this precision by visually differentiating infected from affected dentin during caries excavation.

UNDERSTANDING THE DENTIN LAYERS

Dentin carious lesion is not homogeneous. It can be divided into two distinct zones:

• Infected dentin — irreversibly demineralized and heavily contaminated with bacteria; must be completely removed.
• Affected dentin — partially demineralized but capable of remineralization; should be preserved to maintain tooth vitality and strength.

The difficulty lies in identifying the exact transition between these two layers. Caries Detector facilitates this decision by providing a visual endpoint for excavation.

MECHANISM OF ACTION

Caries Detector selectively stains the infected outer dentin a vivid scarlet red while leaving the affected and sound dentin unstained.

This clear chromatic differentiation allows clinicians to identify residual infected tissue and avoid unnecessary removal of reparative dentin.

Depending on the clinical situation, the material can be used:

• In shallow cavities, prior to cavity opening for assessment.
• In deep lesions, following initial excavation to guide further selective removal while preventing pulpal exposure.

CLINICAL PROTOCOL

1. Preparation – After rubber dam placement, wash and dry the carious tooth.
2. Application – Place one drop of Caries Detector on a disposable brush and apply to the cavity.
3. Reaction time – Allow ten seconds for staining to occur.
4. Rinsing – Rinse thoroughly with water to remove excess dye and reveal the stained areas.
5. Selective removal – Excavate the red-stained infected dentin with a low-speed rotary instrument, avoiding the unstained tissue.
6. Verification – Repeat application if necessary to ensure complete removal of infected dentin.

The procedure yields a clean, sound dentin surface ready for adhesive bonding and restoration.

INTEGRATING WITH MINIMALLY INVASIVE RESTORATIVE WORKFLOWS

Caries Detector represents the first step in a conservative restorative protocol, aligning with the philosophy of minimum intervention dentistry (MID).

When combined with Kuraray Noritake Dental’s range of adhesive and restorative materials, clinicians can achieve:

• Controlled removal of infected dentin 
• Enhanced bonding to sound, remineralizable dentin
• Optimized aesthetic and long-term restorative outcomes

CONCLUSION

By translating histological principles into a practical chairside tool, Caries Detector allows clinicians to perform caries excavation with greater accuracy and confidence.

It supports minimally invasive principles, preserves tooth vitality, and lays the groundwork for durable, esthetic restorations.

Caries Detector — precision you can see.

Restorative dentistry continues to evolve — driven by smarter materials, refined techniques and a growing demand for streamlined solutions that do not compromise the outcomes.

In BOND 12 Magazine, we explore how modern ceramics, composites and adhesive technologies are shaping more efficient, predictable and aesthetic restorative workflows.

This latest issue brings together clinical expertise and material science, featuring inspiring case reports, expert insights and innovative techniques for both dental practitioners and dental technicians. Highlights include a tribute to Kiyoko Ban, a pioneer in dental technology, in-depth perspectives on the evolution of zirconia, and practical approaches to anterior and posterior restorations — from simplified composite layering to flowable injection and hybrid techniques.

Check out BOND Magazine Vol. 12 to discover the stories, techniques, clinical cases and ideas shaping contemporary restorative dentistry.

Start Reading: BOND | VOLUME 12 | 12/2025

Previous versions:

BOND | SPECIAL LAB SIDE EDITION | 07/2025

BOND | VOLUME 11 | 07/2024

BOND | VOLUME 10 | 10/2023

BOND | VOLUME 9 | 08/2022

BOND | VOLUME 8 | 12/2021

HOW TO OPTIMIZE ALL-CERAMIC RESTORATION BOTH AESTHETIC AND MECHANICAL?

A homogeneous porcelain structure, a strong bond between framework and veneering layer and a natural play of colours: All those characteristics of a high-quality all-ceramic restoration are not only strongly dependent on manual skills of the dental technician, but also on ideal firing conditions.

Only with a well maintained and properly functioning furnace and the right protocols, it is possible to obtain consistently great results in terms of aesthetics and function.

This is true for all kinds of all-ceramic restorations consisting of a framework and a veneering layer: It applies to full layering with a classical anatomical framework design and a relatively thick layer of porcelain, as well as to various cut-back designs finished using the modern micro-layering technique. A material that belongs to the latter category of porcelains and is becoming increasingly popular among dental technicians worldwide is CERABIEN™ MiLai (Kuraray Noritake Dental Inc.). The set of low-fusing porcelains and internal stains has been specifically developed for micro-layering, and works well with different variants of lithium disilicate and zirconia.

While the firing parameters provided by manufacturers like Kuraray Noritake Dental serve as reliable and thoroughly tested guidelines, experienced technicians often explore beyond these standards to achieve the highest possible aesthetic and functional outcomes.

This is precisely what MDT Nondas Vlachopoulos has done with CERABIEN MiLai.

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High-quality treatment is probably the most important element on the road to patient satisfaction. During every single appointment, the patient wants to feel well cared for by a skilled professional, while chair time and the number of appointments should be reduced to the necessary minimum. This implies that, in the context of prosthodontic treatment, a restoration needs to fit perfectly straight away and be stable over time to avoid remakes and extra appointments.

As explained in the first part of this series of articles, the quality of the selected prosthetic material – e.g. zirconia – has a decisive impact on the design, overall quality and long-term performance of definitive restoration. That is why you as a dental practitioner should

• order restorations that are produced domestically or in a region with the same standards as your own,
• know about the source of the zirconia your laboratory partner uses, and
• avoid deals that are too good to be true.

WHY ASK YOUR LABORATORY TO USE KATANA™ Zirconia

When quality matters, and you want to be sure that the zirconia restorations from your dental laboratory partner offer the desired mechanical and optical properties, requesting KATANA™ Zirconia can be a wise choice. This family of high-quality dental materials provides laboratories with everything they need to deliver restorations that you and your patients will appreciate, regardless of indication and no matter how unique the requirement. This is largely thanks to two factors: sophisticated multi-layered technology and a meticulous blank production process.

THE KEYS TO BRILLIANT AESTHETICS

Early zirconia materials often had a whitish, opaque appearance and were used mainly as framework materials. On the other hand, the dental zirconia used by dental laboratories today is typically pre-shaded and available in various levels of translucency. Some blanks even offer multi-layered technology: Recognising the importance of varying chroma and translucency in different areas of a natural tooth, Kuraray Noritake Dental Inc. has pioneered this trend. In 2013, the company became the first to introduce a blank with a polychromatic structure (KATANA™ Zirconia ML), featuring a natural gradient in chroma and a seamless transition between layers for a tooth-like appearance.

Initially developed for monolithic restorations, which are just polished or characterized with external stains and glazed, this new type of zirconia also inspired the micro-layering technique. Here, restorations are designed in full contour with only a slight cutback in the vestibular area, allowing for subtle porcelain effects that replicate the optical properties of enamel.

Continuous improvements of this first multi-layered zirconia generation ultimately resulted in the current zirconia portfolio offered by Kuraray Noritake Dental Inc. It consists of a multi-layered block for chairside milling machines, a classical framework material, and the KATANA™ Zirconia Multi-Layered discs series – even including a blank with flexural strength gradation:

Fig. 1. Four-layer colour structure of the KATANA™ Zirconia Multi-Layered series

KATANA™ Zirconia Block – Multi-layered block for chairside milling (available for CEREC and other chairside milling machines), with an 18-minute speed-sintering option* for natural tooth-coloured single restorations and short-span bridges.

^{*Speed-sintering option available only with compatible furnaces.}

KATANA™ Zirconia HT – High-strength zirconia for single-unit copings and long-span bridge frameworks, available in five different disc thicknesses.

KATANA™ Zirconia UTML – Ultra-translucent zirconia with a multilayered colour structure, ideal for monolithic anterior restorations including veneers.

KATANA™ Zirconia STML – Balanced translucency and strength for beautiful monolithic restorations, with natural colour gradation. This variant is ideal for crowns and up to three-unit bridges.

KATANA™ Zirconia HTML PLUS – High-translucency option with the strength needed for long-span bridges, offering vivid, natural colour.

KATANA™ Zirconia YML – Advanced zirconia with colour, translucency and strength gradation, featuring a strong body and highly translucent enamel layer for a virtually unlimited indication range.

THE KEYS TO HIGH-QUALITY RESTORATIONS

Zirconia quality depends on factors such as raw material purity, chemical composition, grain size and particle distribution. Every stage of production – from powder preparation to pressing and pre-sintering – affects the final mechanical and optical properties. Kuraray Noritake Dental Inc. optimises each of these steps to achieve consistently high quality.

1. RAW MATERIALS

Unlike most manufacturers who purchase pre-fabricated powders (from partners like Tosoh Corporation), Kuraray Noritake Dental Inc. produces all components in-house, including zirconium oxide, yttrium oxide, aluminium oxide, and those elements forming the company’s proprietary multilayer technology. This innovative technology is used to form a polychromatic blank structure and – in the case of KATANA™ Zirconia YML – additional translucency and flexural strength gradation.

Fig. 2. Powder for KATANA™ Zirconia

BENEFITS

• Natural translucency
• Shades matching VITA classical A1-D4™ shade guide concept
• Well-balanced flexural strength
• Precise millability for outstanding fit
• High ageing resistance
• Predictable sintering performance

2. PRESSING

A uniform density distribution throughout the blank and homogeneous material structure are essential for predictable processing outcomes and accurate fit. Kuraray Noritake Dental Inc. uses a unique pressing process that is designed to create even pressure distribution, minimise airborne particle contamination and reduce gravitation forces. This results in the desired purity and density of the zirconia blanks.

BENEFITS

• Uniform mechanical and optical properties
• Outstanding edge stability
• High surface quality
• Controlled sintering deformation

3. PRE-SINTERING

Pre-sintering gives pressed blanks the stability needed for milling. The selected temperature profile and duration of the pre-sintering cycle determine the material’s strength and hardness and processing properties, and have an impact on the final sintering process. The procedure used by Kuraray Noritake Dental Inc. results in blanks that are stable yet easily machinable with standard diamond-coated tools, without increased breakage risk or excessive tool wear.

Fig. 3. Restoration margins have been milled to a very thin profile, and yet they still show smooth margins without any chipping

BENEFITS

• High surface quality after milling
• Shorter sintering times possible (54 minutes for single tooth restorations and bridges with up to three units made of KATANA™ Zirconia UTML, STML, HTML PLUS or YML; 18 minutes in the case of KATANA™ Zirconia Block)

EVERYTHING YOUR LABORATORY PARTNERS NEED

Whether your partners in the laboratory prefer to work with different zirconia variants tailored to specific needs or a single material for all indications, whether they prefer full porcelain layering or simplified finishing techniques: KATANA™ Zirconia delivers the versatility needed – with a consistently high quality aimed at exceeding expectations.

Knowing this – and knowing how to distinguish high from poor quality zirconia materials – allows you to contribute significantly to the high quality of the prosthetic work produced in the dental laboratory. If you then also establish a well-structured, standardized and bidirectional flow of information maintaining records between practice and laboratory (e.g. by using checklists or a digital platform), all members of the restorative team are able to perform at their best for predictable treatment outcomes and long-term success.

COMPLEMENTARY PRODUCTS FOR THE DENTAL PRACTICE

Regarding the remaining clinical steps like the successful cementation of the delivered zirconia restorations, Kuraray Noritake Dental Inc. is a trustworthy partner, too: As well as offering complementary products for polishing, staining, glazing and veneering of zirconia restorations, the company is also a leading provider of clinical products such as resin cements, adhesives and cleaning agents. KATANA™ Cleaner, for example, can be applied both intra-orally and extra-orally, removing contamination from the bonding surfaces (tooth and restoration) after try-in. Applied to the pre-treated surface directly after cleaning, high-performance resin cement systems like PANAVIA™ V5 establish a strong bond to tooth structure and zirconia (as well as other restorative materials), so that high success rates are achieved even with partial restorations that offer minimal macro-mechanical retention1,2. Finally, if modifications are needed, TWIST™ DIA for Zirconia is a great option. It is suitable for polishing intra-orally and delivers a natural surface gloss. The products are well aligned and designed to complement each other for smooth workflows and outstanding results.

Literature

1. Blatz MB, Alvarez M, Sawyer K, Brindis M. How to Bond Zirconia: The APC Concept. Compend Contin Educ Dent. 2016 Oct;37(9):611-617; quiz 618. PMID: 27700128.
2. Alqutaibi AY, Alghauli MA, Almuzaini SA, Alharbi AF, Alsani AA, Mubarak AM, Alhajj MN. Failure and complication rates of different materials, designs, and bonding techniques of ceramic cantilever resin-bonded fixed dental prostheses for restoring missing anterior teeth: A systematic review and meta-analysis. J Esthet Restor Dent. 2024 Oct;36(10):1396-1411.

Article by doctors Tom Boujenah and Olivier Boujenah.

KEEP IT SIMPLE WHILE MEETING THE PATIENT’S INDIVIDUAL DEMANDS

Every day in our practices, we are faced with a choice between different treatment options. Experience, scientific literature, and patient preferences all help guide us toward one direction or another.

The case presented below could have been managed using a different approach, but the chosen solution aligned with our philosophy: keep it simple while meeting the patient’s individual demands.

A PATIENT WITH HIGH AESTHETIC DEMANDS

A young patient, in his early twenties, presented for consultation with a purely aesthetic concern. He had been wearing a double-retainer resin-bonded fixed dental prosthesis (Maryland bridge) (Figure 1) for several years, placed due to the congenital absence of the mandibular central incisors. Although the bridge had served him well functionally, the patient now wished to replace it with a more aesthetic solution, better matching the current shade of his natural teeth. After clinical and radiographic assessment, several treatment options were considered, taking into account the patient’s age, bone volume, and aesthetic expectations.

The final decision was to fabricate a new resin-bonded bridge, optimized in terms of both design and shade, using a multilayered zirconia to achieve a natural-looking result.

Fig. 1. Initial situation

Fig. 2. iTero 5D+ optical scan

PRELIMINARY STEPS IN THE DENTAL OFFICE

A pre-treatment impression of the bridge was taken before removal, using the iTero 5D+ scanner (Align Technology; Figure 2). These pre-treatment scans, which are performed almost systematically for our prosthetic reconstructions, allow the laboratory to capture the volume of the existing prosthesis, replicate the previous shape (if suitable), and often visualize wear facets. This helps minimize or even eliminate the need for subsequent adjustments. Then, the existing resin-bonded bridge was removed, and the abutment teeth were prepared as minimally invasive as possible. Once again, the intraoral scanner was used to take an impression of the situation (Figure 3).

Fig. 3. Impression after bridge removal and minimal preparation of the lingual surfaces

PRODUCTION OF THE RESIN-BONDED BRIDGE

The scan was sent directly from the intraoral scanner to the Design4me platform (a 3D design platform) to carry out the digital design of the planned bridge (Figures 4 and 5). A repositioning key was also designed by the dental technicians to provide for accurate seating of the bridge during cementation (Figure 6). The material of choice was KATANA™ Zirconia YML, a multi-layered zirconia from Kuraray Noritake Dental Inc., shade B1. It seemed most appropriate due to its outstanding physical and aesthetic properties—specifically its gradient in shade translucency and flexural strength (Figure 7).

Fig. 4. Design of the new bridge using exocad software (Design4me platform)

Fig. 5. View of the soft tissue underneath the bridge showing slight gingival compression

Fig. 6. Repositioning key designed using exocad software (Design4me platform)

Fig. 7. KATANA™ Zirconia YML disc (shade shown not representative of the case presented)

The production centre, DIGISMILE, subsequently received the STL files of the bridge and the positioning key, modeled by the dental technicians on the Design4me platform, ready for milling and printing. We also provided the laboratory with intraoral photos to replicate the surface texture, possible characterizations, and shades. The laboratory performed the milling of the bridge using a DWX-52D milling machine (Roland DG). Polishing, surface finishing, and staining were carried out using Komet burs and Miyo liquid porcelain (Jensen). The repositioning key, meanwhile, was 3D printed with a NextDent 5100 3D Printer (3D Systems) using surgical guide resin (Figure 8).

Fig. 8. Milled bridge and 3D-printed key after polishing and staining

DEFINITIVE PLACEMENT IN THE DENTAL OFFICE

The adhesive cementation procedure is one of the most critical steps of the whole workflow. Once the bridge had arrived in the dental office and try-in was successfully completed, the focus was on moisture control and the establishment of ideal bonding conditions. In this context, strict working field isolation with saliva ejectors, cotton rolls, and ideally a rubber dam is essential, followed by the pre-treatment of the abutment teeth and the retainer wings of the zirconia bridge.

PRE-TREATMENT OF THE TOOTH STRUCTURE

Since the tooth preparations are strictly limited to enamel, the following conservative bonding protocol was adopted:

• Etching with phosphoric acid for 30 seconds on the enamel surfaces.
• Thorough rinsing with water, followed by gentle drying without desiccating the enamel.
• Application of PANAVIA™ V5 Tooth Primer (Kuraray Noritake Dental Inc.), followed by thorough drying with mild air after a 20-second waiting time. This primer contains MDP, which is essential for reliable enamel/zirconia adhesion.

PRE-TREATMENT OF THE ZIRCONIA WINGS OF THE BRIDGE

Even though the intaglio surface was sandblasted in the laboratory, it is crucial to repeat this step in the clinic:

• Cleaning with KATANA™ Cleaner (Kuraray Noritake Dental Inc.) for 10 seconds or ultrasonic cleaning for 5 minutes, followed by rinsing with water.
• Sandblasting with 50 μm aluminum oxide (Al2O3) at 2 bar.
• Application of CLEARFIL™ Ceramic Primer Plus (Kuraray Noritake Dental Inc.) to the intaglio surface without rinsing, followed by gentle drying. This primer also contains MDP, providing for a proper chemical bond to zirconia.

ADHESIVE CEMENTATION

With all surfaces pre-treated appropriately, adhesive cementation proceeded as follows:

• Application of PANAVIA™ V5 Paste (universal shade A2) to the intaglio of the bridge.
• Insertion of the bridge using the repositioning key.
• Light curing (“tack” cure) for 3 to 5 seconds to stabilize the restoration.
• Removal of excess resin cement with a dental explorer. Alternatively, excess may be removed immediately with a soft brush before applying to light cure for the margins.
• Final complete light curing according to the manufacturer’s instructions (Figures 9 and 10).

Fig. 9. Clinical situation captured immediately after cementation

Fig. 10. Lateral view of the restoration immediately after cementation

TREATMENT OUTCOME

Thanks to the pre-treatment scan and the overlay of the old bridge with the new one, no adjustments were necessary, although occlusion control remained essential. At a recall after 18 months, gingival integration was satisfactory: The patient was able to use interdental brushes and maintain the prosthesis properly (Figures 11 and 12).

Fig. 11. Clinical situation 18 months after definitive placement

Fig. 12. Lateral view at 18 months

CONCLUSION

In this clinical case, the choice to produce a double retainer resin-bonded bridge, almost identical in design to the previous one, may seem conservative. However, this decision is supported by several factors: The patient’s good tolerance of the previous prosthesis, the tissue integrity of the abutment teeth, and, most importantly, the opportunity to significantly improve aesthetics thanks to advances in materials and bonding techniques, which allowed us to keep preparations minimal and minimally invasive.

This new bridge, designed with highly aesthetic multilayer zirconia and bonded using a strict protocol, achieved a perfectly integrated and natural result without resorting to more invasive options (therapeutic gradient). Furthermore, this approach invites the restorative team to consider emerging trends in resin-bonded bridge design, notably the option of two single-retainer cantilever bridges, which might be considered in similar cases in the future.

This case highlights the importance of individualized treatment planning, which does not rely solely on innovation, but on precise clinical assessment, attentive listening to patient needs and expectations, careful implementation of available tools, and the use of high-quality materials and protocols.

Dentists:

OLIVIER BOUJENAH

Dr. Olivier Boujenah earned his Doctorate in Dental Surgery from Paris V in 1994 and a University Diploma in Maxillofacial Surgical Rehabilitation from Paris VII in 2008. A pioneer in digital dentistry, he founded DIGISMILE, a training center and fully digital laboratory, and DIGISMILE LAB, dedicated to prostheses and surgical guides. He teaches in the Master’s program in Digital Dentistry at the University of Geneva and has pursued advanced training at Harvard University in digital workflows and guided surgery.

TOM BOUJENAH

Dr. Tom Boujenah graduated from the European University of Madrid in 2023 and completed a University Diploma in Oral Implant Rehabilitation at the Pitié-Salpêtrière Hospital in Paris. Based in private practice in the 16th district of Paris, he focuses on aesthetic and functional oral rehabilitation with a particular interest in implant dentistry and digital workflows. Passionate about innovation, he integrates the latest advances in implantology, prosthodontics, and digital dentistry to deliver personalized and long-lasting treatments.

The impact of a material switch in the dental laboratory

Switching to a different type of zirconium is not something you do lightly. Was the leap to KATANA™ Zirconia worth it? Three dental lab owners share their experience!

Not all zirconium oxide materials are created equal. Dental technicians worldwide recognise that zirconium oxide discs vary significantly in quality depending on their composition and manufacturing process. The most noticeable differences lie in their mechanical and optical properties, both of which are determined during production. At first glance, zirconium oxide products from leading manufacturers may seem similar. However, —sometimes invisible—differences can exist. Achieving the highest quality requires the use of premium raw materials, advanced cleaning and pressing techniques, and precise pre-sintering methods. These factors help ensure superior results while minimizing the risk of remakes. Selecting a high-quality zirconium oxide product is crucial, particularly when working with complex structures or specialised processing techniques. The right choice can significantly impact the final outcome and durability of dental restorations.

We had a conversation with three decision makers of Norwegian dental laboratories to learn more about their reasons to switch to the KATANA™ Zirconia Multi Layered Series (Kuraray Noritake Dental Inc.) and their path to success with these materials. Espen Rørstad is the owner and general manager of Vestfold Dental in Tønsberg, Lucas Andvik the general manager of Cicero Dental AS in Trondheim and Hilsen Egil Berg the general manager of dental technology at Berg Dental in Askim. They are happy to share their experience and practical tips and tricks.

Time for change

The reasons to start testing alternative zirconium oxide materials were different: Espen Rørstad, who has been a dental technician for 24 years, was looking for improvements in strength and aesthetics: “Nowadays, zirconium materials are evolving quickly, and specifically those blanks with multi-layered colour, translucency and flexural strength attracted my attention. I first tested a material from another leading manufacturer. Then, I received a single disc of KATANA™ Zirconia YML. I was immediately impressed by the homogeneous, densely pressed material and its optical properties. Ever since my first trial case with KATANA™ YML, I have not used any other zirconium oxide again.”

Choosing the right material

Hilsen Egil Berg uses KATANA™ Zirconia YML for most indications, and KATANA™ Zirconia HTML Plus for large reconstructions of ten or more units. The design is predominantly monolithic with a small (vestibular) cutback. The approach of Espen Rørstad is similar. He also uses KATANA™ Zirconia YML on a regular basis for reconstructions with up to ten units, even on implants in combination with Ti-bases. “For larger-span restorations, I most frequently opt for KATANA™ Zirconia HTML Plus or, occasionally KATANA™ Zirconia HT combined with a traditional layering approach”. Lucas Andvik uses all four types of multi-layered zirconia from Kuraray Noritake Dental Inc. (KATANA™ Zirconia UTML, STML, HTML Plus and YML) to have the best of all worlds.

Establishing workflows

Switching materials always means investing time and effort until processes run smoothly and predictably. According to Espen Rørstad, it did not take long with KATANA™ Zirconia to get the parameters right and obtain high-quality results. According to him, a factor that is critical for good outcomes with KATANA™ Zirconia YML is positioning of the restoration in the disc. “Proper positioning is key to success – long-span reconstructions are only stable if positioned according to the manufacturer’s recommendations. The learning curve is quite steep and we have no issues with fractures,” he says. Lucas Andvik slightly adjusted his production procedure to provide for great outcomes: “Initially, we tried to position our restorations in blanks of the heights we had used before, and this turned out to be quite challenging. In order to have enough space for the connectors and be able to position long-span restorations in the middle of the disc as recommended, we started utilising higher blanks. With this strategy, the initial challenges were a thing of the past.”

What makes KATANA™ Zirconia different

KATANA™ Zirconia is engineered with precision at every step of the production process, from raw powder production to disc pressing, every step is tightly controlled for consistency and quality. It’s the result of decades of expertise in ceramics and full in-house control. Every disc reflects that precision and expertise, offering you high quality zirconium oxide with outstanding features;

• Dual gradient structure (YML): A seamless transition in both translucency and strength.
• High green-state stability: Thin margins, no chipping. Fewer sprues, smoother carving, and optimal material use.
• Targeted yttria balance: Optical translucency where needed, strength where it matters, each layer is purposefully composed.
• Speed sintering: 54-minute cycles delivering consistent aesthetics and mechanical performance.
• Optimized density and CTE: Uniform density and a stable coefficient of thermal expansion in all layers ensure minimized sintering deformation and high fitting accuracy.

Easy carving

One of the practical benefits of using KATANA™ Zirconia is the fact that it is perfectly suitable for carving. Lucas Andvik states: “Carving is easier with KATANA™ Zirconia than with other materials. It is even possible to go close to the margins without increasing the fracture risk. Other materials seem to be much less dense and softer, which may result in marginal fractures. Carving is really a feature that transformed our inhouse production procedure and contributes to great outcomes.” Espen Rørstad and Hilsen Egil Berg agree that carving feels great with this material, while the former also stresses that the overall aesthetics when using the carving technique are very well received by partners from dental offices.

Mastering the sintering process for optimal results

A procedure known as a critical step in the production procedure is the sintering. Virtually every leading manufacturer of hightranslucency zirconium oxide advises users to calibrate furnaces and check the achieved temperatures on a regular basis to provide for optimal outcomes. The actual sintering protocols recommended for each material, however, are very different. Kuraray Noritake Dental Inc. offers three sintering programms valid for all four materials of the KATANA™ Zirconia Multi-Layered series: The standard sevenhour programme is available for all kinds of prostheses, while the high-speed 54-minute and 90 minute programmes are suitable for restorations with up to three units. For KATANA™ Zirconia Blocks, even18-minute sintering is possible. Lucas Andvik uses the seven-hour programme for over-night sintering of all large restorations, and speed sintering for single-tooth restorations and small bridgeworks during the day. With his new furnace, he simply adopted the recommended protocols. Espen Rørstad modified the protocols slightly for his furnace and regards speed sintering as a great option for rush cases. Hilsen Egil Berg prefers over-night sintering. He reports: “It is really important to have a high-quality, modern furnace, calibrate it regularly and follow the manufacturer’s instructions. My recommendation for everyone experiencing issues is to pay extra attention to warming up and cooling down properly. That way, you achieve the highest possible strength and aesthetics, including an absolutely smooth transition between the different layers in the blank.”

Micro-layering: A game changer for finishing

In all three dental laboratories, the integration of KATANA™ Zirconia has led to a shift towards higher-efficiency finishing approaches. Espen Rørstad reports: “The switch to KATANA™ Zirconia enabled us to increase the amount of monolithic and micro cut-back zirconium oxide restorations from around 40 to 80 percent. In the anterior area, we use a minimal vestibular cutback and micro-layering, while the restorations are purely monolithic and only minimally pre coloured in the posterior area. Classical layering is only delivered on special request.” Hilsen Egil Berg states: “We completely stopped using traditional porcelain layering approaches and prefer micro-layering instead – especially in combination with KATANA™ Zirconia YML. The aesthetic outcomes are so good that a cosmetic dentist recently called me and asked if I had used lithium disilicate instead of zirconium.” Lucas Andvik also likes to add a little bit of porcelain: “We moved away from a full cutback to micro-layering approaches, using the same porcelain system for lithium disilicate and zirconium oxide,” he says. In subgingival areas, he often just polishes the restorations for highest biocompatibility, a concept that is very well received by dental practitioners.

Happy with the results?

Hilsen Egil Berg concludes: “Once you have implemented the workflow and set all parameters, working with KATANA™ Zirconia is really great. My staff likes its handling during carving, the efficient workflows and predictable results. Although sometimes the product may be more expensive than other brands’ zirconium oxide, the total economy is a lot better: We do no longer face any issues with fractures and remakes, and due to the homogeneous material structure, the service life of our milling tools is extended, while, at the same time, the edge stability of the milled restorations is increased. The blanks are so homogeneous that I am able to sinter long-span restorations without a lateral support!”

The conclusion of Lucas Andvik is similarly good: "everyone in my laboratory working with KATANA™ Zirconia is more than satisfied. My co-founder, Katharina, has tested many different materials on behalf of notable manufacturers and has never seen anything that compares to KATANA™. All the technicians that work with KATANA™ here consider it to the most versatile and aesthetic we have ever utilized. I think that all four variants are super nice to work with. My personal recommendation is to attend one of the courses offered by Kuraray Noritake Dental Inc. The instructors are super knowledgeable and we got a completely new conception of zirconium oxide as well as practical advice that was really useful for our daily work.”

Espen Rørstad is sure that “in terms of aesthetics, KATANA™ Zirconia is the best zirconium oxide tested, and I really tested a lot in the past decades! I am happy with the material, the interaction with the Kuraray Noritake Dental team and the support offered. My team is also happy with the material, but even more important is the positive feedback of my customers: One of them requested a specific zirconium all the time, and when we switched, we did not tell him immediately. Now he knows and is very happy with what he gets.” Espen is sure that economically, KATANA™ Zirconia YML is even able to compete with cheap zirconium oxide brands, as the production procedure is much more efficient and the results are predictable.

Switching zirconium oxide materials is a significant investment in both time and resources, but for many dental laboratories, the results speak for themselves. The experiences shared by these Norwegian technicians demonstrate that KATANA™ Zirconia offers a balance of aesthetics, strength, and efficiency. While adapting to new workflows takes effort, the improved outcomes, fewer remakes, and enhanced handling make the transition worthwhile. For those considering the switch, thorough testing and training are key to ensuring a smooth and successful integration.

PRACTICAL IMPLEMENTATION TIPS

• Review and adjust milling, sintering, and finishing protocols to match the manufacturer’s recommendations.
• Train technicians on best practices for positioning restorations within the blank to ensure strength and aesthetics.
• Optimise material selection for different cases
• Regularly calibrate sintering furnaces and check temperature accuracy to avoid issues like fractures or compromised aesthetics.
• Work closely with the supplier for technical support and guidance when setting up new workflows.

ACHIEVE CONSISTENT, NATURAL-LOOKING RESTORATIONS WITH CONFIDENCE

Shade selection is one of the most critical steps in restorative dentistry — and one of the most challenging. The KATANA™ Zirconia Shade Selection Guide provides practical, evidence-based recommendations to help clinicians and technicians achieve predictable, lifelike results every time.

Inside, you’ll find clear guidance on how abutment color, restoration thickness, milling and sintering conditions, and finishing methods influence the final shade outcome. Backed by Kuraray Noritake Dental’s expertise, this guide is designed to simplify your decision-making, minimize remakes, and support optimal aesthetics across different workflows.

Download now and equip your practice or lab with proven strategies for shade selection success.