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ePaper created 2016-04-05, 13:01:42 | version 1.38.0
laser 1 2016 12 | research Evaluation of a self-adhesive composite in dentin surfaces Preparation with Er,Cr:YSGG laser Authors: Dr Ana Catarina Nogueira da Silva, Prof. Paulo Ribeiro Melo, Prof. Sofia Arantes Oliveira & Prof. Norbert Gutknecht, Portugal, Germany Table 1: Self-adhesive flowable resin composite used in this study. Introduction Flowable resin composites appeared in the late 1990s, and they have properties like low modulus of elasticity and high wettability, which are very desirable for the clinical work.1, 2 The development of dentistry has eventually led to minimal invasive dentistry, with smaller preparations, giving the flowable resin composite an important role due to its flow characteristics and easy application.3 Self-adhesive flowable resin composites com- bine a bonding system and a flowable composite. This kind of material is an adequate tool to use in more difficult patients and children, because it al- lows a restorative procedure with less steps and less time in the dentist chair. The self-adhesive flowable resin composite used in this study was the Vertise™ Flow (VF) from Kerr, was released in the market in 1992, and has the OptiBond™ bonding mechanism to dentine.4 This material has the char- acteristics described in the Table 1. The GPDM (phosphate functional group) forms a chemical bond with the calcium ions on the tooth, and the prepolymerized filler present in the VF minimises the shrinkage and enhance proper- ties of clinical handling. The VF does a microme- chanical adhesion with the formation of a hybrid layer, which consists in resin impregnation with collagen fibres and dentin smear layer.4 Dentin is a mineralised subtract of the tooth which has an intricate three-dimensional frame, with tubules extending from the pulp to the den- tino-enamel junction, intratubular and peritubular dentin. It has 70 % (by weight) of mineral, 20 % of organic component and 10 % of fluid. The compo- sition of the organic matrix is 90 % of fibrillar type I collagen and 10 % of noncollagenous proteins like phosphoproteins and proteoglycans. Because of this complex structure, only a few structure-prop- erty relationships can be performed.5, 6 Actually, the formation of a hybrid layer, with the monomers impregnation into the dentin partially de- mineralised, and its subsequent polymerisation seems to be the most successful method.7, 8 Erbium lasers cavity preparation results in the absence of smear layer, opened dentinal tubules and micro irreg- ularities on the dentin in result of the removal of the intertubular dentin, outcoming in a dentin surface more suitable to adhesive procedures. The effect of laser on the collagen network is still not completely Self-adhesive flowable resin composite ID Material Manufacturer Compositions VF Vertise™ Flow Kerr GPDM, HEMA, prepolymerized filler, 1-µm barium glass filler, nanosized colloidal silica, nanosized Ytterbium fluoride 12016