Tensile bond strength of four adhesive systems to dentin

Purpose: To assess, in vitro, the tensile bond strength to dentin of the fo llowing adhesive systems: Single Bond (3M), One Coat Bond (Coltene), Clearf il Liner Bond 2 V (Kuraray) and Etch & Prime 3.0 (Degussa). Materials and M ethods: Thirty third molars, extracted according to therapeutic indication, were used. The roots were removed at the cement-enamel junction level and the crowns were sectioned in a mesial-distal direction, obtaining buccal an d lingual halves. The dental portions were included in self-cured acrylic r esin, abraded on a lathe under water spray and polished to 400 and 600 grit . The adhesive systems were applied on dentin according to manufacturers' i nstructions and resin-based composite (Z100) cones were bonded. For each ad hesive system, 15 specimens were prepared, stored in distilled water at 37 degreesC during 24 hrs and submitted to tensile bond strength tests on a un iversal testing machine (EMIC DL-2000) at a crosshead speed of 0.5 mm/min. Results: The mean tensile bond strength to dentin (MPa +/- SD) were statist ically different (ANOVA, Tukey's tests, P less than or equal to 0.01, shown by asterisks) from each other: (1) Clearfil Liner Bond 2 V* = 24.8 +/- 3.3 ; (2) One Coat Bond** = 20.4 +/- 2.0; (3) Single Bond** = 18.1 +/- 2.4; (4) Etch & Prime 3.0*** = 5.8 +/- 2.4.