IADR Abstract Archives
Bond-strength comparison of a new universal adhesive to a gold-standard
Objectives: Aim of this study was to compare the shear bond strength of the new 1-step/1-bottle-adhesive iBOND Universal (iBUN, Heraeus Kulzer) applied in an etch & rinse and in a self-etch technique to a 3-step/2-bottle-adhesive Optibond FL (OFL, Kerr) initially and after thermocycling.
Methods: Eighty-four flat dentin specimens were prepared from bovine incisors and embedded into acrylic resin. Dentin surfaces were roughened using SiC paper 320 to imitate smear layer. Twenty-eight undergraduate dental students were asked to apply iBUN in a self-etch and in an etch-rinse mode as well as OFL on the dentin specimens (n=14). All adhesives were used according to their instructions for use. For the iBUN E&R-group and OFL, the dentin was etched with iBOND Etch 35 Gel (Heraeus Kulzer). After air-drying and light curing, 10s for iBUN, 20s for OFL (Translux Wave, Heraeus Kulzer) by the students, composite cylinders (Venus Pearl A2, Heraeus Kulzer) were placed on the bonded surface, using the Ultradent equipment, and light cured. Half of the specimens were stored in water at 37°C for 24h, whereas the other half were additionally thermocycled (5000 cycles, at 5°C and 55°C). Shear bond strength was then determined using a universal testing machine (Ultradent) at a crosshead speed of 1mm/min. Statistical analysis was performed using ANOVA followed by LSD post-hoc test (p<0.05).
Results: Shear bond strengths (MPa) for specimens initially/after thermocycling were: Optibond FL 31/24, iBOND Universal Etch&Rinse 33/25, iBOND Universal Self-Etch 28/24. Same letter denotes no statistical significant difference between groups (Figure 1).
Conclusions: iBUN showed bond strength both in etch & rinse and self-etch bonding technique comparable to the gold-standard OFL even after thermocycling. iBOND Universal exhibited low technique sensitivity even for inexperienced users.
Methods: Eighty-four flat dentin specimens were prepared from bovine incisors and embedded into acrylic resin. Dentin surfaces were roughened using SiC paper 320 to imitate smear layer. Twenty-eight undergraduate dental students were asked to apply iBUN in a self-etch and in an etch-rinse mode as well as OFL on the dentin specimens (n=14). All adhesives were used according to their instructions for use. For the iBUN E&R-group and OFL, the dentin was etched with iBOND Etch 35 Gel (Heraeus Kulzer). After air-drying and light curing, 10s for iBUN, 20s for OFL (Translux Wave, Heraeus Kulzer) by the students, composite cylinders (Venus Pearl A2, Heraeus Kulzer) were placed on the bonded surface, using the Ultradent equipment, and light cured. Half of the specimens were stored in water at 37°C for 24h, whereas the other half were additionally thermocycled (5000 cycles, at 5°C and 55°C). Shear bond strength was then determined using a universal testing machine (Ultradent) at a crosshead speed of 1mm/min. Statistical analysis was performed using ANOVA followed by LSD post-hoc test (p<0.05).
Results: Shear bond strengths (MPa) for specimens initially/after thermocycling were: Optibond FL 31/24, iBOND Universal Etch&Rinse 33/25, iBOND Universal Self-Etch 28/24. Same letter denotes no statistical significant difference between groups (Figure 1).
Conclusions: iBUN showed bond strength both in etch & rinse and self-etch bonding technique comparable to the gold-standard OFL even after thermocycling. iBOND Universal exhibited low technique sensitivity even for inexperienced users.