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Dental Tribune South African Edition

9Press ReleasesDental Tribune South African Edition - August 2013 3M dental innovation preserves tooth structure The development of adhesive resin cements in dentistry allows maximum preservation of tooth structure during preparation and new indications such as adhesive bridges and onlays. However, while it opened new possibilities in dentistry, adhesive cementation was a very technically sensitive topic for dental practitioners because the cementation procedure involved a great number of separate steps, leading to clinical challenges. Developers at 3M ESPE™ have focused on improving and simplifying the handling properties of these products. In early 2012, 3M ESPE™ launched its most recent innovation in this field: RelyX™ Ultimate Adhesive Resin Cement, which was designed to combine high bond strength with easy handling. Dr. Reinhold Hecht, Division Scientist at 3M ESPE, gave insight into product development and reported on the major strengths of the new material. Dr. Hecht, what was the reason for your decision to develop a novel resin cement – was there still room for improvement despite the large number of available materials? Broad market research and direct feedback from dentists revealed a need for a new adhesive resin cement with improved properties. The growing popularity of CAD/CAM technologies for the fabrication of restorations has resulted in a wider range of restorative materials used in daily practice. Particularly etchable glass ceramics and resin nano-ceramics are gaining significance, and these material classes place very high demands on bond strength and aesthetics. Existing adhesive resin cements require a complex procedure using a variety of adhesive and primer systems to achieve high bond strength. Therefore, 3M ESPE™ developed a product that combines high bond strength and excellent overall material properties with easy handling by the use of only one adhesive/primer system – Scotchbond™ Universal Adhesive. What kind of restorations may be bonded with the new material? RelyX™ Ultimate covers an extremely broad range of indications. The cement is specifically designed for the cementation of highly demanding etchable glass ceramics. However, it is also suited for the permanent cementation of other ceramic, composite and metal inlays, onlays, crowns and bridges on natural teeth or implant abutments, as well as for non-retentive indications like Maryland and inlay/onlay bridges. In addition, it may be utilised for the cementation of veneers as well as posts and screws. Best results regarding bond strength and simplicity are obtained when the product is combined with Scotchbond™ Universal Adhesive, a highly versatile adhesive that is equally suited for both self-etch and etch and rinse techniques. What are the benefits of this product combination for the dentist? On the one hand, the adhesive ensures high bond strength to enamel and dentin both in the total-etch and self-etch mode, and on the other hand also functions as a primer providing high adhesion to all types of restoration materials thus simplifying the cementation procedure. This combination is ideal for the cementation of etchable glass ceramics. The system RelyX™ Ultimate/Scotchbond™ Universal Adhesive ensures easy handling by the reduction of several working steps: for example, light-curing of the adhesive can be omitted since the cement contains a dual-cure activator that initiates the curing process of the adhesive. Since Scotchbond™ Universal Adhesive also functions as a metal and ceramic primer as well as a silane agent for etchable glass ceramics, it is not necessary to apply specific primers to the restorations prior to cementation. To sum up, both products are unique in their composition and were optimised to develop beneficial properties when used in combination. You mentioned “uniqueness” as an important factor. What are the unique ingredients incorporated in RelyX™ Ultimate Adhesive Resin Cement? As mentioned above, the first key component is the integrated dual-cure activator for Scotchbond™ Universal Adhesive. This component is not just an activator for the adhesive system, but is also a part of the redox initiating system of the resin cement itself and thus is responsible for the self-curing ability of the luting material. Furthermore, the initiating systems used for RelyX™ Ultimate are free of aromatic amines which are known to cause discolouration. Thus, apart from the dual-cure function, this compound also contributes to long-term colour stability of the cement in both curing modes. The third key feature of RelyX™ Ultimate is a specific surface treatment of the fillers that leads to an improved covalent bonding to the resin matrix. This change in the chemical formulation results in an improved wear resistance. Finally, the new cement was given tooth-like fluorescent properties, which is particularly important for highly aesthetic margins. The challenge was to incorporate these ingredients without causing unwanted interaction with other substances in the formulation. DT Scotchbond™ Universal Adhesive and RelyX™ Ultimate Adhesive Resin Cement. RelyX™ Ultimate Adhesive Resin Cement has a tooth-like fluorescence. The South African Society of Endodontics & Aesthetic Dentistry Eduardo Mahn Chile International keynote speakers Nomads 2013 Vodacom World, Midrand Johannesburg: 7 and 8 November 2013, Hands-On Course:9 November 2013 CapeTown: 9 November 2013 Visit www.nomadsday.com for further information and online registration Stephan Lampl Switzerland Nick Russon UK Alasdair McKelvie UK Henriette Lerner Germany Wilhelm Pertot France MAX 4 ETHICAL 23 CLINICAL CPD POINTS