429 Too Many Requests

TECHNOLOGIE DE POLYMÉRISATION INNOVANTE
PANAVIA™ Veneer LC est un ciment photopolymérisable alliant plusieurs technologies pour vous proposer une force d’adhésion maximale.

SCELLEMENT DE L’INTERFACE
La technologie touch-cure modifiée est utilisée pour obtenir un temps de travail plus long tout en conservant la force d’adhésion qui fait la réputation de PANAVIA™. PANAVIA™ Veneer LC, combiné à PANAVIA™ V5 Tooth Primer, ajoute un composant chimique important à un ciment photopolymérisable.

En tant que primer automordançant destiné à la structure dentaire (dentine et émail), PANAVIA™ V5 Tooth Primer scelle soigneusement l’interface dent-adhésif dès que PANAVIA™ Veneer LC Paste entre en contact avec celui-ci. Cette polymérisation touch-cure « modérée » initie la polymérisation à l’interface de l’adhésif uniquement et établit une adhésion forte immédiate à l’émail et à la dentine, sans impacter la prise du ciment, ni donc le temps de travail.

TEMPS DE TRAVAIL
Pendant les procédures de collage, de multiples facteurs externes influencent votre temps de travail. La technologie à la base de PANAVIA™
Veneer LC tient compte de ces facteurs. La technologie Touch-cure permet un scellement immédiat de l’interface dentaire, ce qui constitue
la base de forces d’adhésion élevées. La technologie de photopolymérisation offre un temps de travail de 200 secondes à lumière ambiante*
avant que le PVLC ne perde sa plasticité parfaite. Ces 200 secondes vous permettent de poser et de positionner confortablement vos (multiples)
facettes. La polymérisation finale a lieu pendant l’illumination à la lampe à photopolymériser permettant au ciment de prendre correctement.
*Lumière ambiante ; 8 000 lux env.

NOUVELLES CHARGES
PANAVIA™ Veneer LC doit sa souplesse de maniement aux nouvelles charges de silice sphériques et nanoclusters (teneur en charges : 66 % poids, 47 % vol.). Plus de relâchement ni de dérive grâce aux propriétés thixotropiques du ciment. PANAVIA™ Veneer LC permet une application contrôlée, reste en place une fois appliqué, mais s’écoule bien pendant la pose de la ou des facettes.
Grâce à sa consistance et à sa faible épaisseur de film (≈ 8 μm), PANAVIA™ Veneer LC produit une couche fine et régulière de ciment, contribuant ainsi à un placement simple, sans interférence. De plus, l’utilisation de petites charges sphériques uniquement (taille des particules : 0,05 μm - 8 μm) permet d’obtenir des bords lisses, très esthétiques, tout en favorisant la polissabilité et une brillance durable.

CHARGES DE SILICE
Les nouvelles charges de silice sphériques dans le ciment garantissent son maintien là où il est appliqué, tout en s’écoulant bien pendant le placement de la facette, ce qui permet un placement aisé sans relâchement ni dérive. Pendant l’application sur la surface en creux, le ciment résine ne colle pas à l’embout applicateur, propriété obtenue par l’ajout de charges nanoclusters sphériques à la pâte.

Ces nouveaux types de charges offrent une surface particulièrement lisse, une excellente rétention de la brillance ainsi qu’un maniement aisé.

VISCOSITÉ ET THIXOTROPIE
La viscosité d’un ciment est importante et elle doit être suffisamment faible pour éviter la fracture de la prothèse lors du positionnement. Simultanément, sa fluidité ne doit pas être telle qu’il s’écoule pendant l’application et le placement de la restauration.
Comme PANAVIA™ Veneer LC contient une charge / un mélange de résine optimisés, sa viscosité peut être modifiée sous pression. Ce phénomène est appelé la thixotropie. La pâte devient plus fluide sous pression pendant le placement et le positionnement de la facette. Inversement, lorsque la pression diminue, la viscosité augmente à nouveau. Grâce aux propriétés thixotropiques PANAVIA™ Veneer LC, la pâte se répartit aisément, la pression nécessaire pour positionner la prothèse est faible et l’excès s’élimine sans difficulté. Bref, vous bénéficiez d’un contrôle maximal.

Les matériaux de viscosité identique ne partagent pas forcément la même thixotropie. En effet, la température et la pression ont un impact sur la viscosité. Lorsque la pression diminue, un matériau retrouve sa viscosité d’origine à une vitesse et dans une mesure qui dépend de sa thixotropie.

Prosthodontic treatment concepts have evolved over the past decades. While some time ago, porcelain-fused-to-metal crowns and bridges were placed wherever a defect was too large for a direct restoration, the current trend is toward less invasive therapies with highly aesthetic, tooth-coloured materials.

These modern treatment concepts can lead to reliable outcomes when a high-performance resin cement system is used that establishes a durably strong bond to tooth structure on one side and the restoration on the other. The reason is that less invasive often means that restorations have minimal or no retentive elements and extremely thin walls, and a strong chemical bond is a mechanism that holds them in place over time. Depending on the type of restoration and area in the mouth, aesthetic properties of the cementation system are also extremely important, as the typically highly translucent, thin restorations tend to reveal the appearance of the structures underneath to a certain extent.

Universal cements

In the context of striving toward the streamlining of clinical procedures in restorative dentistry, several manufacturers have developed resins cements that work with fewer components and are suitable for a large number of indications. PANAVIA™ SA Cement Universal is a popular example. The self-adhesive, dual-cure resin cement is the only product of its category that works as a standalone solution even on glass ceramics (without the need for a separate primer).

The need for specialists

There are specific clinical situations, however, that require more working time than a dual-cure resin cement can offer. This is the case whenever multiple non-retentive restorations are to be placed simultaneously, a technique that is recommended for veneers. The greatest benefits of placing the thin and highly aesthetic restorations at once lie in the proper positioning of the restorations and in the minimized risk of contamination: When the veneers are placed one after the other, a slightly malpositioned and already fixed veneer might hinder proper positioning of the adjacent restorations and haemorrhage occurring in the context of excess cement removal or finishing of the margin might contaminate the working field. When all veneers are placed simultaneously, repositioning is possible, while excess removal and polishing are accomplished in a moment when blood and debris will no longer endanger the integrity of the restorations, which increases the security during the whole procedure. This task is best fulfilled by a light-curing veneer specialist.

Handling of a thin ceramic veneer.

Required properties of veneers cements

Undoubtedly, the key feature of a specialist resin cement system is a long working time sufficient for simultaneous cementation of multiple restorations. In addition, its consistency and handling properties are also important as they can help users overcome the challenge of accurate positioning and reduce the time and effort involved in veneer placement. And finally, the system needs to provide excellent bond strength over time and support long-lasting aesthetics, properties valuable for every kind of resin cement, but the latter being particularly important for thin restorations in the aesthetic zone. Luckily, PANAVIA™ Veneer LC offers all those features.

The system consists of PANAVIA™ V5 Tooth Primer that establishes a strong bond to enamel and dentin, PANAVIA™ Veneer LC Paste as the cement and the CLEARFIL™ CERAMIC PRIMER PLUS that has been part of PANAVIA™ V5 cementation system. The latter is responsible for a high bond strength to all types of restorative materials.

Mastering the working time challenge

The light-curing cement paste offers a long working time of 200 seconds* due to its excellent stability under ambient light. As a consequence, dental practitioners may place multiple veneers simultaneously without having to race against setting. Polymerization may be started whenever the user is ready for it. The one-component self-etching tooth primer (PANAVIA™ V5 Tooth Primer) does not contain any photo initiators and does not cure alone. When applied, it etches and penetrates into the tooth surface for 20 seconds and is ready to bond strongly to PANAVIA™ Veneer LC Paste. The integrated touch-cure technology is the key feature safeguarding a high bond strength to tooth structure without shortening the working time.

*Working time under ambient light on PANAVIA™ V5 Tooth Primer (8000 Lux): 200 seconds

Providing for precise placement

In order to streamline the clinical seating procedure from cement application to polishing, PANAVIA™ Veneer LC has been equipped with a set of well-balanced handling properties. Newly developed spherical silica fillers in the cement provide that it stays put where applied, but flows well when the veneer is seated on the tooth – for easy placement without drifting or sagging. During application across the intaglio surface, the resin cement does not stick to the application tip, a property achieved by the addition of nanocluster filler technology. The special design of the syringe’s application tip optimizes control over the amount of cement applied. Ans last but not least, excess cement may be easily removed in one piece using an explorer after a one-second tack-cure, while polishing of the margins is quickly accomplished.

Hiding the margins

Being extremely thin, highly translucent and mainly used to restore teeth in the exposed anterior region of the maxilla, veneers have to be placed with a cement that is and remains undetectable underneath the restoration and at its margins. PANAVIA™ Veneer LC is available in four highly aesthetic shades with matching try-in pastes, so that a precise shade match with the restoration can be achieved and verified in the patient’s mouth. Additional features contributing to undetectable margins are the resin cement’s flowability and low film thickness: They enable users to easily produce an evenly distributed, thin cement layer for aesthetic outcomes. For those afraid that coffee, tea, acidic drinks or constant tooth brushing might reveal the margins over time, there is good news as well: PANAVIA™ Veneer LC offers a high polish retention and colour stability over time. The well-balanced formulation and the touch-cure technology are responsible for this resistance to discolouration.

Trusted expertise

All these beneficial features make PANAVIA™ Veneer LC worth testing. Additional arguments are the fact that its primers are tried and tested components of the highly popular PANAVIA™ V5 system and that Kuraray Noritake Dental Inc. is a proven expert on adhesive products. It developed the original MDP Monomer in 1981 and introduced the first adhesive resin cement containing this monomer in 1983. Since then, the company has improved existing formulations and developed existing technologies that ultimately resulted in the current line-up of cementation solutions for every need and indication.

Excellent gloss retention is one of the properties providing for undetectable margins over time.

Kuraray Noritake Dental’s reputation as a pioneer in the field of dental adhesives is grounded in its development of the MDP monomer. Patented in 1981, the monomer was used two years later in the composite cement PANAVIA™ EX and has since formed the backbone of many other successful products. Now, the company has combined the original MDP monomer with hydrophilic amide monomers to create rapid bond technology that powers CLEARFIL™ Universal Bond Quick - a universal solution emblematic of Kuraray Noritake Dental’s history of success and commitment to innovation.

Advances in modern dental bonding technology have resulted in a reduction in the number of components needed for total-etching and self-etching processes. However, the basic handling of these adhesives has, by and large, changed surprisingly little. Many adhesives require a shaking of the bottle before usage, extensive rubbing of the liquid and/or waiting for a period of time. Often the application of multiple layers is needed. A reliance on slow penetrating monomers means that, for traditional one-bottle adhesives, bonding to the challenging dentine substrate is a slow and technique-sensitive process.

Through the integration of newly developed amide monomers, rapid bond technology provides CLEARFIL™ Universal Bond Quick with excellent hydrophilic properties and the ability to penetrate the wet dentine fast and effectively. There is no need to wait after the application for air-drying before proceeding - this delay has been eliminated - and a tight and long-lasting seal of the cavity is established after light-curing. Bonding with CLEARFIL™ Universal Bond Quick is easy and efficient and comes with predictable clinical outcomes, thanks to rapid bond technology.

Impressively low water sorption

One of the most important indicators of long-term success in dentine bonding is the level of water sorption in the bond’s organic matrix. A high rate of water sorption has been clinically linked to the ongoing physical deterioration of bonds, which may lead to the development of secondary caries. For this reason, we have chosen to keep the HEMA content as low as possible.

CLEARFIL™ Universal Bond Quick creates a highly cross-linked polymer network owing to the amide monomers used in rapid bond technology. As a result, it demonstrates a relatively low rate of water sorption, meaning that these cross-linked polymers are more stable in the long term.

Aesthetic, effective bonds

Rapid bond technology does not just provide a basis for long-lasting bonding excellence. The thin film layer (5–10 μm) of CLEARFIL™ Universal Bond Quick delivers restorations a clear aesthetic appeal, and its densely cross-linked polymer network reinforces the stability of this outer layer and provides resistance to marginal discoloration.

By combining Kuraray Noritake Dental’s original MDP monomer with hydrophilic amide monomers, rapid bond technology is truly the engine that powers CLEARFIL™ Universal Bond Quick.

By Franklin Tay, BDSc (Hons), PhD

STATE-OF-THE-ART CURRENT ADHESIVES

Manufacturers have adopted an etch-and-rinse approach or a self-etch approach in the design of adhesives for bonding restorative materials to tooth structures, which differ in how these adhesives interact with dental hard tissues. Etch-and-rinse adhesives are offered as two- or three-step systems, depending on whether primer and bonding are separate or combined in a single bottle. Likewise, self-etch adhesives are available as one- or two-step systems. Etch-and-rinse adhesives are often preferred when large areas of enamel are still present, while self-etch adhesives provide more predictable bonds to dentin.

Despite current trends toward fewer and simpler application steps, one-step adhesive systems appear to be less predictable than multi-step etch-and-rinse and self-etch systems. Some manufacturers have recently introduced more versatile single-bottle “universal” or “multi-mode” adhesives that encompass self-etch chemistry but also enable the same adhesive to be used with phosphoric acid-etching in the etch-and-rinse mode. Some universal adhesives also incorporate silane primer for chemical bonding to silica-based ceramics, and methacryloyloxydecyl dihydrogen phosphate (MDP) for chemical bonding to zirconia-based ceramics. Because clinical studies on universal adhesives are short-term, they cannot be considered state-of-the-art in the context of evidence-based dentistry. Conversely, two-step mild, self- etch adhesives have been well-tested in clinical trials and represent the current state-of-the-art for bonding to dentin, with reduced incidence of postoperative sensitivity when compared to etch-and rinse adhesives.

DEVELOPMENT OF CONTEMPORARY ADHESIVES FROM A RESEARCHER’S PERSPECTIVE

The current thinking by researchers is that dentin bonding is not as durable as it was originally perceived. This lack of durability is attributed partially to secondary caries around restorative margins that are devoid of enamel and partially to the degradation of the adhesive joint. The latter may be caused by the hydrolysis of ester bonds in the adhesive component by salivary esterases, or by degradation of water-rich, resin-sparse regions of the hybrid layers by endogenous collagen-bound proteases such as matrix metalloproteinases (MMP) and cathepsin K, that are activated from their dormant preforms to active forms by the acidity of contemporary adhesives. These activated enzymes slowly degrade the denuded collagen matrix within hybrid layers, resulting in gradual loss of adhesion.

Much work has been done in developing therapeutic dental adhesives that are able to resist secondary caries and degradation of the adhesive joint. One of the most thoroughly studied antimicrobial resin monomers is the quaternary ammonium methacrylate developed by Kuraray known as methacryloyloxydodec ylpyridinium bromide (MDPB). This polymerizable resin monomer is incorporated in the two-step self-etch adhesive CLEARFIL™ SE Protect. Recent research has demonstrated that MDPB resin is also an effective inhibitor of both MMP and cysteine cathepsins, thereby providing a mechanism to increase the longevity of resin–dentin bonds by preventing collagen degradation. Indeed, an in-vitro and in-vivo study (Donmez, et al. J Dent Res. 2005;84:355-359) showed that resin-dentin bonds created with CLEARFIL™ SE Protect (aka, CLEARFIL™ Protect Bond) did not degrade after 1 year when compared with a similar self-etch adhesive that did not incorporate the MDPB resin monomer.

MOST COMMON CLINICAL APPLICATIONS OF CLEARFIL™ SE PROTECT

As a board-certified endodontist, the author uses CLEARFIL™ SE Protect as an antimicrobial adhesive to establish coronal seal after finishing root canal treatment to prevent reinfection of the peri-radicular tissues via coronal leakage through the filled root canals (Figure 1 and Figure 2). Another common use of CLEARFIL™ SE Protect is the restoration of the access cavity prepared through a zirconia-based full-coverage restoration. By taking advantage of the MDP component, the author feels more confident that he can bond to the zirconia with a resin composite without causing leakage along the composite-zirconia interface.

Disclaimer: This article was provided by Dr. Tay.

Fig 1. Preoperative radiograph of tooth No. 18. Diagnosis: pulpal necrosis with symptomatic api-cal periodontitis.

Fig 2. Postoperative radiograph of tooth No. 18. Coronal seal was created with radiolucent antimicrobial self-etching adhesive (CLEARFIL™ SE Protect, arrow) and a radiopaque flowable composite, followed by placement of a cotton pellet and a temporary restoration.

ADVANCED NEW FEATURES FOR MORE CONFIDENCE

Studies show that the risk of bacteria remaining in cavities tends to increase with smaller minimal intervention cavities (S. Imazato; Dent. Mater. J. 2009).

CLEARFIL™ SE Protect contains a new functional monomer MDPB, which exhibits an “Antibacterial Cavity Cleansing Effect” (Fig 3).

Fig 3. The bactericidal mechanism of MDPB is presumed to be similar to the well-known antibacterial agent CPC**, which is in many toothpastes and mouth rinses. **Cetyl pyridinium chloride

EXCEPTIONAL RESEARCH RESULTS

Increased durability of resin-dentin bonds

Recent research has demonstrated that MDPB is also an effective inhibitor of matrix metaloprotinases (MMP) that may deplete collagen.

The advantage of MDPB over chlorhexidine (CHX) is that it polymerizes with adhesive resins and cannot leach from the hybrid layer.

(Pashley et al. Compend Contin Educ Dent. 2011)

Fluoride-release

CLEARFIL™ SE Protect contains a patented, specially treated sodium fluoride (NaF); the NaF in CLEARFIL™ SE Protect is coated with a unique polymer capsule that allows release of NaF while the bonding layer physical properties, including strength, are maintained.

Simple proven procedure - avoid technique sensitivity

CLEARFIL™ SE Protect is a two bottle primer and adhesive bonding system.

• No scrubbing needed to achieve good bond strength to tooth structure
• No shaking required Bond itself maintains homogeneity and creates no worries in the quality of the first and last drop of adhesive.

DIRECT RESTORATION

Follow the standard procedures for isolation, moisture control, cavity preparation and pulp protection.

Dentist:

FRANKLIN TAY, BDSC (HONS), PHD

Franklin Tay is Professor and Chair in the Department of Endodontics, College of Dental Medicine, Georgia Regents University, Augusta, Georgia, and a Fellow of the Academy of Dental Materials, as well as a Diplomate of the American Board of Endodontics. With more than 400 papers published in peer reviewed journals, his research interests include biomineralization of collagen scaffolds with apatite and/or silica, remineralization of resin-dentin bonds, antimicrobial sol-gel chemistry, mesoporous silica, and endodontic materials.

First published in COMPENDIUM, April 2014, Volume 35, Number 4.

For the placement of veneers, a resin cement must be selected that supports long-lasting aesthetics, is easily applied, offers a working time sufficient for simultaneous cementation of multiple restorations and provides excellent bond strength. The new “PANAVIA™ Veneer LC” is precisely what you need.

For the pretreatment of the tooth you can use PANAVIA V5 Tooth Primer as shown in our previous workflow video.

BUT did you know that CLEARFIL Universal Bond Quick is also an option? Today’s video demonstrates exactly how. Check it out!

Hypersensitivities make patients suffer, no matter what their cause is. Kuraray Noritake Dental Inc.’s TEETHMATE™ DESENSITIZER is the solution for all of them. Designed to crystallize hydroxyapatite (HAp) from the ground up, the material effectively and durably occludes exposed dentinal tubules and enamel cracks. The tubules may be exposed due to gingival recession, dental erosion or excessive toothbrushing, professional tooth cleaning, scaling and root planning, tooth whitening or restorative procedures. TEETHMATE™ DESENSITIZER provides lasting hypersensitivity relief in all those cases – a fact that is surely one of the reasons for its winning of a Dental Advisor award for the eighth consecutive year.

Consisting of natural calcium and phosphate, the product may even be applied to freshly prepared tooth structure without negatively affecting the bond strength of subsequently utilized dental adhesives or cements.

The consultants of the Dental Advisor conducted a six-month clinical study to be able to evaluate the performance of TEETHMATE™ DESENSITIZER. They selected 27 patients with hypersensitivity issues in their dental practices. Thermal testing with cold air was used to identify the affected teeth, 54 of which were included in the evaluation. For the initial assessment, patients were asked to evaluate their level and frequency of hypersensitivity per tooth on a five-point scale (1 = severe, persistent sensitivity to 5 = no sensitivity). Subsequently, TEETHMATE™ DESENSITIZER was applied according to the instructions for use. Sensitivity was evaluated again immediately after the treatment and six months later. At baseline, 91 percent of the patients stated that they had no or only mild, sporadic sensitivity, which was still the case for 85 percent after six months. This indicates that the product is very effective in providing immediate and even long-term hypersensitivity relief.

Hence, it is not surprising that TEETHMATE™ DESENSITIZER has been among the winners of the Dental Advisor’s Top Product Award every year between 2015 and 2022.

Study results that confirm the material’s effectiveness in reducing pre- and post-operative sensitivity in the context of tooth whitening¹ and indirect restoration procedures² are also available, so that users can count on a reliable performance in a wide range of indications.

1 Mehta D, Jyothi S, Moogi P, Finger WJ, Sasaki K. Novel treatment of in-office tooth bleaching sensitivity: A randomized, placebo-controlled clinical study. J Esthet Restor Dent. 2018 May;30(3):254-258.

2 Shetty R, Bhat AN, Mehta D, Finger WJ. Effect of a Calcium Phosphate Desensitizer on Pre- and Postcementation Sensitivity of Teeth Prepared for Full-Coverage Restorations: A Randomized, Placebo-Controlled Clinical Study. Int J Prosthodont. 2017 Jan/Feb;30(1):38-42.

It is difficult to cover every flowable composite indication with a single viscosity: Sometimes, you need it to stay put where applied or malleable to create a specific shape. In other situations, you need it runny so that it flows into every corner or undercut. In order to meet all those needs, Kuraray Noritake Dental Inc. offers CLEARFIL MAJESTY™ ES Flow with three different levels of flowability: High, Low, and Super Low. The level of flowability is selected depending on the indication, the geometry and size of the cavity. For example, the high-flowability option is best suited as a cavity liner, while the super low flowability variant is preferable in the context of composite veneering.

However, the material has much more to offer, as confirmed by the consultants of the Dental Advisor who have honored the product with an Editors’ Choice and a Top Product Award for the seventh time in a row (Volume 39, Number 01, January-February 2022).

The 29 Dental Advisor consultants tested the medium flowability variant (Low) of CLEARFIL MAJESTY™ ES Flow in their dental practices. They assessed the product’s performance regarding placement/handling, aesthetics, viscosity and polishability. All four properties received an “excellent” rating. CLEARFIL MAJESTY™ ES Flow Low shows no running during placement, while it offers a good adaptation to the cavity walls and even flows into narrow areas. Equipped with Kuraray Noritake Dental Inc.’s Light Diffusion Technology, the material integrates seamlessly with the surrounding tooth structure and a glossy surface is obtained simply by wiping with a cotton roll soaked in alcohol.

Due to these properties and a convincing overall performance, the product received a 98 percent rating, and all 29 consultants stated that they would recommend CLEARFIL MAJESTY™ ES Flow to a colleague. Since 2015, the product has won the Top Product Award time and again, and with its three viscosities, it is likely to become your favourite product for an even broader range of indications.

By Dinesh Sinha, BDS, PHD, Senior Technical and Marketing Manager Dental Division, Kuraray America, Inc.

The all-ceramic restoration market, including that for zirconia, lithium disilicate, and lithium silicate, has been growing rapidly worldwide since the beginning of the 2000s. With the increasing market demand, various dental manufacturers market different dental ceramics that can be used in many dental prosthetic applications. These materials require different minimum thicknesses and preparations to successfully function in the oral environment.

STRENGTH OF DENTAL CERAMICS (FLEXURAL STRENGTH)

The most common method of measuring ceramic strength is by evaluating its flexural strength (in megapascals, MPa). The flexural strength test applies a force on the top of a ceramic specimen, which causes the specimen to bend and fracture. The International Standards Organization (ISO) and the ADA have developed a standard for measuring the flexural strength of dental ceramics. Two methodologies are commonly used today:

• The biaxial flexural strength method (Figure 1): a circular, ceramic specimen/disc that is supported by 3 points, and force is applied in the middle.
• The 3-point bend method (Figure 2a): a rectangular specimen/bar is used and supported by 2 points, and force is applied in the middle. The 3-point bending test for flexural strength is mostly used with zirconia.

Both tests are acceptable; however, ceramics tend to produce higher values when tested with the biaxial method compared to the 3-point bend method. Furthermore, even in a 3-point bending test, if the span lengths (Figures 2b and 2c) of the specimens are increased, ceramic tends to bend abruptly and fail or crack easily. The span length setting in the 3-point bending test for flexural strength plays a critical role in establishing the flexural strength test value. The ISO does provide a guidance on testing that ceramic bars can be in the span length of 12 to 30 mm, but 12 mm and 30 mm can produce completely different flexural strengths. In other words, the shorter the span length, the higher the flexural strength. It is important that clinicians or dental ceramists understand the testing conditions before comparing or selecting the best ceramic for suitable clinical conditions.

Fig. 1: Biaxial Bending Flexural Strength Test.

Fig. 2: 3-point Bending Flexural Strength Test with different span lengths.

INCREASING THE STRENGTH OF CERAMICS

The most straightforward method of increasing the strength of a ceramic is to increase its thickness. This means the preparation depth needs to be higher and may not be favorable in a minimal intervention. There are times when the clinical situation itself may limit the thickness to which a tooth can be prepared (eg, lower incisors). In these cases, another option is to select a stronger ceramic material. In general, dental zirconia has a higher strength compared to lithium disilicate.

Another option is to adhesively (resin) bond the ceramic restoration to the tooth surface. This will easily increase the fracture resistance of a ceramic. Kuraray Noritake Dental Inc. has a legacy of inventing groundbreaking technologies in resins and ceramics. We invented and introduced the Original MDP monomer in 1981. All Kuraray Noritake PANAVIA™ cement brands (Figure 3) contain this MDP monomer. These cements perform best with KATANA™ Zirconia material (Kuraray Noritake Dental Inc.) (Figure 4). Currently, due to the wide availability of different materials, it is important to understand and properly interpret ceramic strength before comparing or selecting material for clinical use.

Dentist:

DINESH SINHA, BDS, PHD

First published in: A Journal of Dental Technology | November/December 2021

One of the key features when talking about cements is the ease of removal of excess cement. Our newest cement - PANAVIA™ Veneer LC - offers the ideal paste consistency, a low film thickness and long working time.

But how about excess removal? Do you wonder how do we compare to other similar products?

Check out this video demonstrating an excess removal comparison between PANAVIA Veneer LC and other brands.