fluoride-release versus non fluoride-release bonding agents

ABSTRACT

The purpose of this investigation was to compare the shear bond strength of a fluoride-release, one-component system, bonding agent [Syntac Sprint] with that of a non fluoride-release, one component [Exite] and two-component system [Scotch Bond Multi-Purpose] bonding agents. One hundred and twenty caries free unrestored human teeth were selected for the study. The teeth were mounted in an acrylic resin holder with the buccal surface up. Wet grinding was performed until flat enamel or superficial dentine area of at least 4 mm in diameter was exposed. Each bonding agent was applied to the exposed enamel according to the manufacturer's instructions or to the dentine under three different conditions [according to the manufacturer's instructions, in two successive layers and without dentine conditioning]. Immediately, after application and curing of the bonding agents, the composite part of the specimen [Tetric Ceram HP]was build up. The specimens were loaded to fracture in Lloyed Universal Testing Machine. Mean shear bond strength was calculated for each bonding condition. The data were analyzed and compared using ANOVA and LSD statistical test. After debonding, the specimens were examined using stereomicroscope and scanning electron microscope. The results showed that mean shear bond strength of Syntac Sprint to enamel and dentin were adequate to counteract the reported polymerization shrinkage of composite resin. Application of any of the three bonding agents to dentin in two successive layers has no significant effect on increasing bond strength. All adhesives showed adhesive and mixed adhesive mode of failure in all conditions except in non conditioning dentin condition