Micro-tensile Bond Strength of ScotchbondTM Universal Adhesive and RelyXTM Ultimate Resin Cement to Coronal Dentin
Objective: To evaluate micro-tensile bond strength of three resin cements used with self-etch adhesives which are Panavia™ F2.0, Nexus® 3 and RelyX™ Ultimate Adhesive Resin Cement to coronal dentin.
Materials and methods: Human third molars without any pathological conditions were used in this study. After occlusal enamel was removed, dentin surfaces were flattened and standardized smear layers were created. Resin composite blocks were luted onto dentin with three resin cementsused with their specific self-etch adhesives according to the manufacturer’s instructions; namely (1) Panavia F2.0 used with ED Primer II (PAF/ED), (2) Nexus 3 used with Optibond All-in-one (NX3/ AIO), and (3) RelyX Ultimate Adhesive Resin Cement used with Scotchbond Universal Adhesive (RXU/SBU). All bonded specimens were lightcured and stored in distilled water at 37°C for 24 hours. After that, the specimens were cut by a slowspeed saw into 15 pieces of square resin-dentin sticks for each resin cement, with the cross section of 1 mm2 . Specimens in each group were tested for micro-tensile bond strength testing using a universal testing machine at crosshead speed of 1 mm/min. Statistical analyses were computed by one-way ANOVA followed by Tukey’s post-hoc test. The fractured samples were analyzed using a scanning electron microscope.
Results: The means of micro-tensile bond strength of the three resin cements used with their self-etch adhesives were significantly different (p<0.05). The mean of micro-tensile bond strength of RXU/SBU was the highest and significantly higher than those of PAF/ED and NX3/AIO respectively.
Conclusions: RXU/SBU demonstrated higher micro-tensile bond strength than PAF/ED and NX3/AIO.
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