Microtensile Bond Strength of Self-etching Adhesives to Dentin

The aim of this study was to determine microtensile bond strength of two and one-step self-etching adhesive systems to dentin. 25 intact human third molars were used. Flat surfaces of mid-coronal dentin were exposed and the teeth were divided into 5 groups (n=5). Composite build-ups were made using the following self-etching systems / composite materials: 2-step self-etching system Contax / Ecusphere Carat (DMG), 2-step self-etching system AdheSE / Tetric Ceram (Ivoclar Vivadent), 1-step 2-components selfetching system Futurabond NR / Grandio (Voco) and 1-step 1-component self-etching adhesive G Bond / Gradia Direct (GC Corp.). Two-step etch-and-rinse system PQ Clear with Amelogen Universal composite resin (Ultradent) was used in the control group. Bond strength was assessed with the non-trimming microtensile technique. Statistical analysis was performed using the 1-way ANOVA, followed by the Tukey test for post-hoc comparisons (p<0.05). Investigated self-etching systems showed satisfactory values of microtensile bond strength to dentin after 24 hours. Two-step self-etching system AdheSE resulted in significantly higher bond strength than all the other groups (p<0.001). Microtensile bond strength of self-etching systems Contax, Futurabond NR and G Bond was comparable to the etch-and-rinse system PQ Clear.