Shear bond strength of hydrophilic adhesive systems to enamel

Purpose: To compare the enamel sheer bond strength of four hydrophilic adhe sive systems: one multiple-bottle (Scotchbond Multi-Purpose Plus), two one- bottle (Stae, Single Bond) and one self-etching (Etch & Prime). Materials a nd Methods: 120 bovine incisor teeth were obtained, embedded in polyester r esin, polished to 600 grit to form standardized enamel surfaces, and random ly assigned to four groups (n = 30). Each adhesive system was used on ename l according to the manufacturer's instructions, and resin-based composite ( Z100) cylinders with 3 mm diameter and 5 mm height were bonded. Specimens w ere stored in humid environment for 1 week, and bond strength was determine d using a universal testing machine, at a crosshead speed of 0.5 mm/minute. Results: The mean shear bond strength values (MPa +/- SD) were: Single Bon d: 24.28 +/- 5.27 (a); Scotchbond Multi-Purpose Plus: 21.18 +/- 4.35 (ab); Stae: 19.56 +/- .4.71 (b); Etch & Prime 3.0: 15.13 +/- 4.92 (c). ANOVA reve aled significant difference in means (P < 0.01) and Tukey's test showed the statistical differences that are expressed by different letters for each g roup. It could be concluded that the self-etching adhesive system did not p rovide as good a bond to enamel surface, as did the one- and multiple-bottl e systems.