Development of Single Application Adhesive System for Root Surface Caries

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The purpose of this study was to investigate the bonding ability to enamel and dentin of the new single application bonding systems and compare these with a commercial compomer (Clicker/ F2000, 3M Dental Products), and two-step resin composite bonding systems (Fluoro Bond/ Lite-Fil II A, Shofu Inc. and Single Bond/ Z100, 3M Dental Products). Labial surfaces of extracted bovine teeth were ground on wet 600-grit SiC paper to expose a flattened area of enamel or dentin and then washed and dried with oil-free compressed air. These surfaces were treated according to each adhesive system's instructions and the restorative materials were condensed into a Teflon^【encircled R】 mold (2 mm height, 4 mm internal diameter) and then irradiated. The finished specimens were stored in 37℃ distilled water for 24 hrs from the start of light exposure to the material. Then these specimens were tested in a shear mode at a crosshead speed of 1.0 mm/min. The mean and standard deviation were subjected to an ANOVA followed by the Duncan test (p<0.05). The bond strengths of the single application bonding systems were 12.3〜14.5 MPa for enamel, and 13.7〜13.8 MPa for dentin. These values were comparable to those of the compomer, but lower than those of the two-step resin composite bonding systems. Clinical study using this newly developed single application system has been conducted.