Fluoride release and uptake of fluoride releasing resin-based adhesives in relation to water sorption and solubility

Abstract

The aim of this study was to determine the potential of fluoride-release and -uptake of various resin-based adhesives. Water sorption and solubility were also determined in relation to the potential of fluoride release. Four adhesives containing fluoride, 2-step selfetching systems 1) FB-Bond (FB) in Imperva Fluoro Bond (Shofu), and 2) BOND (PB) in CLEARFIL PROTECT BOND (Kuraray Medical), and one-step systems, 3) XENO CF II Bond (XB: Dentsply/Sankin), and 4) Reactomer Bond (RB: Shofu) were evaluated. For positive controls, a resin-modified glass-ionomer, Fuji II LC (FLC: GC) and a conventional glass-ionomer, Fuji IX (FIX: GC) were used. For negative controls, 1) Adhesive (SB) in Single Bond (3M/ESPE), 2) BOND (MB) in CLEARFIL MEGA BOND (Kuraray Medical), and 3) Bonding Agent (UB) in UniFil BOND (GC) were tested. RB and XB showed much greater fluoride-release and -uptake than those found for FB and PB. RB and XB demonstrated the nearly equivalent or more capacity of fluoride-release and -uptake than those found in glass-ionomers. Higher water sorption and solubility were found for XB, SB and RB, while FB, PB, MB and UB were relatively stable in water. Positive correlations were presented between water sorption and solubility vs. amount of fluoride release.