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8 Dental Tribune Middle East & Africa Edition | February 2015INDUSTRY Simplification at its best The new material is available in capsules and syringes. Shrinkage stress-preventing mechanism in 3M™ ESPE™ Filtek™ Bulk Fill Posterior Restorative. Elena Golubeva Marketing Manager MEA 3M ESPE Division 3M Gulf Ltd., Dubai Internet City, Bldg. 14, 4th floor | Dubai, PO Box 20191 UAE Office: +971 4 3670686 Mobile: +971 52 6072269 Fax: +971 4 3670599 egolubeva@mmm.com www.3M.com Contact Information By Thorsten-Simon Eickholt, 3M ESPE, Seefeld, Germany I s there a need for another posterior restorative in den- tistry? Clearly, the answer is yes. What is desired is a product that offers the mechanical proper- ties users of products like 3M™ ESPE™ Filtek™ Supreme XTE Universal Restorative are famil- iar with, but allows for a more time-efficient placement proce- dure. For this purpose, 3M ESPE de- veloped the new 3M™ ESPE™ Filtek™ Bulk Fill Posterior Re- storative. The material contains true nanotechnology and is available in five shades. It may be placed in increments of up to 5 mm, but if desired, a layer- ing technique is also possible. In combination with the fact that the new material does not re- quire a covering composite layer and is easily sculptable right af- ter placement, this ensures a fast and easy filling procedure ideal for all kinds of posterior restora- tions. Reducing shrinkage stress Traditionally, a reduction in shrinkage and shrinkage stress has been accomplished by opti- mizing the filler composition as in Filtek Supreme XTE Univer- sal Restorative. This restorative uses an innovative filler tech- nology with silica and zirco- nia particles and clusters. The shrinkage inherent to any meth- acrylate matrix is low in this ma- terial and does not compromise its clinical performance when placed in layers of 2 mm. In order to allow for increments of up to 5 mm in Filtek Bulk Fill Posterior Restorative, the nano- filler technology was adopted, but a different matrix devel- oped. The composite contains a new aromatic dimethacrylate with high molecular weight (AUDMA) and a novel addition- fragmentation monomer (AFM). Due to AUDMA, the polymer matrix developing during po- lymerization obtains a higher flexibility. AFM changes the po- lymerization reaction: Typically, light curing causes chains of monomers to form and cross- link with each other, resulting in a polymer network. Those monomers which are closest to the light source react immedi- ately and the chains grow from this point. The increasing rigid- ity and decreasing volume of the network cause stress to develop at the margins. In contrast, AFM contains an additional reactive site that enables cleavage of the forming molecular chains dur- ing polymerization. The obtained fragments are more evenly distributed so that the network relaxes and stress is prevented. Cross-linking again at a later stage, the final polymer structure is obtained. Conclusion The uniform network formation and the increased flexibility of the matrix result in a restoration that causes less shrinkage stress even when applied in 5 mm in- crements. As a consequence, a tight mar- ginal seal is obtained and the risk of post-operative sensi- tivities is minimized, while su- perior physical pro-perties are achieved. This was confirmed in initial tests: Properties such as the without AFM stress During light cure: After polymerization stress with AFM AFM-molecules stress wear resistance and polish re- tention are similar to those of the proven Filtek Supreme XTE restorative. An excellent han- dling and 24% faster applica- tion time was revealed in a field test with European dentists*. In this test, 150 Western European practitioners put the new prod- uct headto-head against their preferred restorative materi- als that require different place- ment techniques. The materials included incrementally placed composites as well as high- and low-viscosity bulk fill materials. The result: 92% of the dentists would recommend the material to a colleague. Office: +97143670686 Mobile: +971526072269 Fax: +97143670599