Comparative evaluation of immediate bond strength to enamel with one-step self-etch adhesives

Abstract

Available knowledge in the literature regarding the immediate bond strength of one-step, self-etch adhesives to enamel surfaces covered with thick layers is limited. Therefore, the immediate bond strength of six one-step, self-etch adhesive systems to enamel surfaces covered with thick smear layers was evaluated. Flattened enamel surfaces were prepared and polished with 180-grit silicon carbide abrasive paper under running water for 20 seconds, to produce thick smear layers similar to clinical conditions. The following were applied to bonding surfaces: self-etch adhesives, six one-step, self-etch adhesives, Adper Prompt L-POP, iBond, Clearfil S3 Bond, AdheSE One F, G-Bond, Optibond All-in-one, one two-step, self-etch adhesive, and Clearfil SE Bond. Bonded teeth were sectioned into sticks immediately after bonding and subsequently subjected to microtensile bond strength testing. Differences in bond strength for enamel were determined using two-way ANOVA with Tukey tests. iBond, AdheSE One F, Optibond All-in-one failed to bond enamel surfaces covered with thick smear layers. However, Adper Prompt L-POP and Clearfil S3 Bond showed similar enamel bond strength to Clearfil SE Bond. It should be noted that the bonding effectiveness of the majority of one-step, self-etch adhesives tested to enamel surfaces covered with thick smear layers is poor.