Shear Bond Strength of Ten Self-etching Systems to Dentine

Objective: The purpose of this in vitro study was to investigate the shear bond strength of ten self-etching systems to dentine after 24 hours of storage. Methods: Two hundred, extracted third, human molar teeth were cleaned, and embedded into metal rings with self-curing acrylic resin. The teeth were ground wet using 600-grit silicone carbamide paper to expose enamel. The samples were randomly divided into 10 groups (n=20). The groups were treated with the following bonding systems according to the manufacturers instructions: Group 1 – SE Bond(SE)(Kuraray), Group 2 – Xeno III (Z)(Dentsply), Group 3 – OptiBond Solo Self-etch (OS)(Kerr), Group 4 – Adper Prompt L-Pop (AP)(3M ESPE), Group 5 – Frog (F)(SDI), Group 6 – Simplicity (S)(Apex Dental) , Group 7 - Protect Bond (PB)(Kuraray), Group 8 – FuturaBond (FB)(VOCO), Group 9 – I Bond (I)(Kulzer) and Group 10 – G Bond(GB)(GC). Following the application of the bonding systems resin composite (Z100) were condensed into an Ultradent mould (diameter=3.2mm) and were light-cured for 40 seconds. Each group of bonded specimens was stored at 37șC water for 24 hours (24h) before the bonds were stressed to failure. The shear test was performed in a Zwick testing machine at a crosshead speed of 1.0mm/min. The mean values (MPa) were analyzed using the Wilcoxon Rank Sum Test. Results: The results were as follows: SE = 26.2 ± 6.8; Z = 17.3 ± 3.7; OS= 21.9 ± 3.5; AP = 15.4 ± 2.7; F = 13.4 ± 3.4; S = 14.6 ± 2.7; PB = 25.9 ± 3.6; FB = 12.6 ± 5.2; I = 8.2 ± 2.7 and GB = 14.4 ± 2.7MPa. Conclusions: There was a statistically significant difference in shear bond strength between the different self-etching dentine bonding systems. SE Bond and Protect Bond attained significantly higher bond strengths compared to all the other systems.