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Evaluation Of Interfacial Type Of Fracture Using Two Adhesive Systems

Abouelleil H*,Villat C,Attik N,Grosgogeat B,Farge P

The aim of this study was to concentrate all the loading forces of a bond strength test on the dentin-adhesive interfaces either bonded with an etch-and-rinse or a one-step self-etch adhesive system; the results were compared to that of a glass ionomer cement. Superficial and deep dentin discs were prepared from freshly extracted teeth and bonded to a one with two-step etch-and-rinse Adper™ Scotchbond™ 1XT (3M ESPE, Seefeld, Germany), and onestep self-etch Adper™ Easy Bond (3M ESPE, Seefeld, Germany), and a control group with glass ionmer cement GC Fuji IX (GC Corp, Leuven, Belgium). The 4 by 4 mm bonded areas were subjected to shear stress and targeted only at the thickened adhesive layer. Bond strength and crack length measurements were obtained. Interface morphology and fracture mechanisms were observed using scanning electron microscopy. Deep and superficial dentin bond strength measurements were statistically significant difference showing higher values for the deep dentin than for the superficial dentin. Crack length measurements for Adper™ Easy Bond showed a higher value than with Adper™ Scotchbond, GC Fuji IX. Scanning electron microscopy demonstrated cohesive failures inside the adhesive layer for both adhesive types. The test setup, with the thickened adhesive layer, made the results more dependent on the mechanical properties (stiffness) rather than on the adhesive properties of the adhesive material itself and reflects its ability to resist the fracture load.