Abstract
This in vitro study aimed to evaluate the micro-shear bond strengths of the newly developed fluoride releasing one-step bonding system (Fluoro Bond Shake-One, FB, Shofu), and Reactmer Bond (RB, Shofu). Sixteen bovines' labial crowns were sectioned to make eight enamel plates and eight dentin plates (12×6×2mm). After the preparation with #600 grit SiC paper, FB or RB was applied to these enamel or dentin surfaces according to the manufacturers' instructions. Then, cylinders of Beautifil (Shofu) were adhered according to the Shimada's method. After 15min or 24 hrs, the micro-shear bond strengths (MSBS) to enamel and dentin of the adhesives were measured (n=10). Two human molars were used for SEM observations of the enamel and dentin surfaces after the treatment with FB or RB. The resin-enamel and resin-dentin interfaces of FB were also observed by SEM. For both 15min-group and 24hrs-group, MSBS to enamel and dentin of FB were significantly higher than those of RB. The dentin bond strengths of 15min-group and 24hrs-group of FB were almost same, and the enamel bond strength of 15min-group of FB was significantly higher than that of 24hrs-group of RB.
