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Dental Tribune Middle East & Africa Edition | 5/2017 INDUSTRY 11 “It’s a game-changer”: Prime&Bond universal™ with Active-Guard™ Technology it allows us to balance several ben- efi ts. For example, enamel is hard, dry and quite brittle, while dentin is porous, wet and spongy, and the amphiphilicity of Active-Guard™ Technology allows us to achieve ex- ceptional bond strength with both substrates. We’ve also achieved an optimum balance between the prop- erties needed for direct and indirect restorations, between high and low viscosity, and between the require- ments for all etching methods. What are some of the additional benefi ts of Prime&Bond universal™? The adhesive layer is extremely thin compared to other universal adhe- sives, which can really help avoid fi t- ting problems with indirect restora- tions. This thinness, combined with a mild pH of about 2.5, also practically eliminates the most common causes of post-operative sensitivity. And it minimizes the risk of pooling, which can otherwise be misinterpreted as a void or decay on a radiograph. We also thought about simplifying the dentist’s workfl ow. Prime&Bond universal™ can be stored at room temperature and remains usable for 30 minutes in a closed CliXdish™, so it’s really designed to minimize waste and help streamline proce- dures, especially when doing multi- ple restorations in a single visit. And we make sure our products work together, so dentists can have a com- plete and reliable solution with no risk of product incompatibilities. We designed Prime&Bond universal™ to work optimally with Calibra® Ceram ce- ment. With this combination, there’s no need to apply a separate activa- tor, and the two products have the right pH values to fuse perfectly, providing much greater shear bond strength compared to other adhe- sives. FIg. 2: Prime&Bond Universal™ most pride? How will this change the practice of den- tistry? Our patented Active-Guard™ Tech- nology platform is completely new. It introduces a new level of robust- ness along with much simpler, more reliable handling properties for vir- tually any case, any substrate and any preparation. It’s a future-orient- ed technology that I’m convinced will lead to more groundbreaking products based on this platform in the future. I’m very proud of that. It’s a game- changer. In all you have accomplished to develop Prime&Bond uni- versal™, what gives you the information For more on Prime&Bond universal™, please con- tact your local Dentsply Sirona repre- sentative. By Dentsply Sirona Dentsply Sirona has introduced a new universal adhesive designed to ensure complete coverage and pen- etration for a reliable bond even if the preparation is overly wet or dry. We spoke with Dentsply Sirona poly- mer chemist Dr. Christoph P. Fik to learn about the remarkable prop- erties of this revolutionary dental adhesive and how Prime&Bond uni- versal™ with Active-Guard™ Tech- nology was developed. Dentsply Sirona: Dr. Fik, can you tell us how a new re- search and development ef- fort gets started? For exam- ple, did the marketing team develop a list of requirements that dentists are looking for in a next-generation adhe- sive like Prime&Bond univer- sal™? Dr. Christoph P. Fik: The mar- keting people do conduct market research and develop a set of re- quirements based on the voice of customers. As chemists, we also have our own insights into the physical and chemical properties that would improve the product and simplify its use for our dental customers. The clinical team also provides sig- nifi cant input, so it’s a collaboration between all three departments to de- fi ne the platform requirements for a new product. We have a series of discussions, doc- ument our agreed-upon objectives, and then kick off the actual develop- ment effort with a clear set of goals in sight that we believe are both benefi - cial and achievable. Talk to us about those goals. What does the ideal dental adhesive need to accom- plish? I see the dentist as a kind of crafts- man, and we want to help them achieve a higher level of craftsman- ship. Every dentist has preferred techniques to achieve a good resto- ration for every case, and we’re not necessarily changing that. We want to help enhance craftsmanship with a universal adhesive that dentists can rely on, a product that makes a difference they can see and feel, eve- ry day they work with it. Dentists want a universal adhesive that’s more convenient, easier and faster, while ensuring a reliable bond. It needs to provide robust perfor- mance across all the different cases a dentist encounters, including direct and indirect restorations. It needs to be simple and predictable to use in every scenario. What are the limitations of competing adhesives, and how does Prime&Bond uni- versal™ overcome them? There are six or seven universal adhesives on the market based on chemistry that’s at least 20 years old. Most of these established adhesives have very high viscosity. Some den- tists may regard that as a benefi t in certain cases, but more often it’s a signifi cant drawback. Prime&Bond universal™ is the fi rst universal ad- hesive that offers low viscosity with a surface tension directly adjusted to dental substrates and related materi- als, making it easier for the adhesive to spread evenly across the substrate and to quickly wet and fully pen- etrate the dental tubules. Other universal adhesives show what I would describe as a passive behaviour. They polymerise, but beyond that they don’t exhibit any active properties to help the dentist achieve optimum results. They can resist spreading, they tend to pool, and they don’t mix with water spon- taneously – so it can be diffi cult to achieve complete, even coverage. the “active” contrast, By in Prime&Bond universal™ with Ac- tive-Guard™ Technology refers to the properties you can actually see working when you apply it to the prepared surface. It actively spreads to help ensure complete and uni- form coverage across the substrate. It actively mixes with any excess water that may be present, which is important for achieving complete penetration on wet dentin. During air drying, the adhesive solvent and excess water evaporate together to actively create an even, homogenous layer, with low fi lm thickness. The active properties you’re describing are completely new in the market for univer- sal adhesives. Active-Guard™ Technology is patented. What is it and how does it work? Active-Guard™ Technology is a resin component. Other universal adhe- sive systems are based on two parts: they combine a very hydrophilic, low viscosity compound – a so-called reactive diluent – with a very viscous hydrophobic compound, trying to fi nd a balance. With Active-Guard™ Technology, we’ve created a new res- in compound that combines hydro- phobic and hydrophilic properties in one monomer. So you don’t have to deal with two parts and reactive dilu- ents – you simply fi nd the balance within a single chemical structure. Could it be described as “am- phiphilic.”? Is that what you mean by a balance of hydro- phobic and hydrophilic with- in a single resin molecule? Yes, but it’s important to distin- guish the amphiphilia of Active- Guard™ Technology from the more familiar use of this term to describe surfactants. With those, you have separate hydrophilic and hydro- phobic parts in one molecule, and that’s what allows you to disperse oil in water, for example. But with Prime&Bond universal™, the whole molecule in itself balances hydro- phobic and hydrophilic properties, without separate hydrophobic and hydrophilic domains of the mol- ecule. That’s unusual in chemistry, and