Abstract
The purpose of this study was to evaluate the adhesive efficiencies of four one-step bonding systems (AQ Bond, One-up Bond F, Reactmer Bond and Xeno CF II Bond), and one wet-bonding system (Excite) as a control, by observation of the resin-dentin adhesive interfaces using a scanning electron microscope. To evaluate the compatibility of resin to dentin and the hybrid layer formation, the longitudinally sectioned surfaces of adhesive samples were polished or then treated with 1N-HCl for 40 sec followed by 2.5% NaClO for 10 min, and observed. In addition, the resin sides of adhesive samples, which were completely dissolved dentin minerals in 6N-HCl for 2 days followed by dissolving of organic components of dentin in 5% NaClO for 10 min, were also observed to evaluate resin tag formation. The compatibility of resin to dentin was good in all systems. For Excite, which utilizes phosphoric acid-etching, the formation of a hybrid layer of 5〜8μm and thick and long resin tags were observed. For one-step bonding systems, on the other hand, no clear hybrid layer was detected by the method used in this study. The resin tags formed with one-step systems were thin and short, except with Xeno CF II Bond.
