Effect of fluoride-containing desensitizing agents on the bond strength of resin-based cements to dentin

Abstract

Objective:The objective of this study was to evaluate the effect of desensitizing agents containing different amounts of fluoride on the shear bond strength of a dual polymerized resin cement and a resin-modified glass ionomer cement (RMGIC) to dentin.Material and Methods:One hundred human molars were mounted in acrylic resin blocks and prepared until the dentin surface was exposed. The specimens were treated with one of four desensitizing agents: Bifluorid 12, Fluoridin, Thermoline and PrepEze. The remaining 20 specimens served as untreated controls. All groups were further divided into 2 subgroups in which a dual polymerized resin cement (Bifix QM) or a resin-modified glass ionomer cement (AVANTO) was used. The shear bond strength (MPa) was measured using a universal testing machine at a 0.5 mm/min crosshead speed. The data were analyzed statistically with a 2-way ANOVA, Tukey HSD test and regression analysis (α=0.05). The effect of the desensitizing agents on the dentin surface was examined by scanning electron microscopy.Results:The fluoride-containing desensitizing agents affected the bond strength of the resin-based cements to dentin (p<0.001). PrepEze showed the highest bond strength values in all groups (p<0.001).Conclusion:Regression analysis showed a reverse relation between bond strength values of resin cements to dentin and the amount of fluoride in the desensitizing agent (p<0.05).

Interactions between resin-based temporary materials and immediate dentin sealing

“…The shear bond strength values following this cleaning were similar to those of the control group, in contrast to previous reports [3,14,17]. It is possible that the mechanical cleaning efforts are responsible for the improved bonding in general [18].…”

The effect of dentin desensitizers on shear bond strengths and vickers surface hardness of self-adhesive resin cement

“…The presence of high amount of F ions on environmental condition can be negatively affect polymerization or conversion rate of resin cement. 33,34 In SP desensitizer group, reverse relation was observed between decrease of surface hardness and increase in SBS value. This may be related to the presence of different chemical ions (glutaraldehyde, isopropyl alcohol, fluoride, triclosan) in SP desensitizer.…”

“…While some of ions such as glutaraldehyde may have positive affect on SBS, 29,35 some of ions like a fluoride may have negative affect on polymerization or conversation rate of resin cement. 33,34 Many vitro studies evaluated the effect of glutaraldehyde and HEMA containing desensitizer (Gluma) on the bonding strength of the traditional resin cement. Some studies concluded that glutaraldehyde and HEMA containing desensitizer has a negative effect, while some studies found that it does not have a significant effect on the bonding strength of the traditional resin cement.…”

“…29,35,36 The application of fluoride containing desensitizers on the dentin surface showed a decrease in the bonding strength of resin cement. 33,34,40 Saraç 34 have stated that an increase in the fluoride amount of desensitizers may reduce connection between dentin and resin. They argued that an increase in the crystal structure precipitated on the dentin surface causes a decrease in the bond strength.…”

Efffect of desensitizing agents on the bond strength of dental adhesive systems

“…In addition to this moisture, the presence of components extrinsic to dentin composition can alter the bond between dentin and restorative materials, as occurs between the materials used in the treatment of dentin hypersensitivity and adhesive systems [13][14][15][16].…”