The aim of this study was to investigate the interface ultrastructure at dentin and hybrid layer formed by novel adhesives with TiO2 nano-fillers. Nano-fillers have shown outstanding mechanical properties and they are widely used as reinforcing materials associated with polymeric matrices for high performance applications. Twenty extracted non carious human teeth were utilized for evaluation of the bonded interface using scanning electron microscopy. The experiments used four novel adhesives (noted A1, A2, A3, A4). Phosphoric acid (5s, 37%) and a commercial resin composite Herculite XRV (Kerr) filling were used for the surface treatment. The interface was studies using scanning electron microscopy (SEM) using a microscope Inspect F-FEI Company. The experimental results indicated the main benefits and disadvantages of the investigated adhesives systems. SEM of the adhesive dentin interface revealed a HAp (hydroxyapatite) – rich and homogenous hybrid layer. This layer produced a favourable sealing of damaged dentin.
Bonding of current adhesives to dentin is usually through the formation of the interfacial hybrid layer between adhesives and dentin. Intertubular and intra-tubular resin infiltration leads to an increase of the quality regarding the dentinal adhesion. The aim of this study is in vitro testing of new experimental adhesives in comparison with commercial adhesive, regarding sorption and solubility as well as to investigate molecular chemical features of the adhesive/dentin interfaces. We used 4 experimental adhesives systems A1, A2, A3, A4 and IBond® (Heraeus) as reference material. Organic phase adhesive system consists of a mixture of monomers. As filler for these systems, besides hydroxyapatite, we used TiO2 nanoparticles. FTIR spectroscopy was used to investigate molecular chemical features of the adhesive/dentin interfaces. The obtained data show the main advantages and disadvantages of the tested adhesive systems. The best values of water sorption and solubility both in water and artificial saliva present A2 and A3 adhesives.
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