IADR Abstract Archives
Bonding Efficacy of Universal Adhesives Applied With/Without Additional Adhesive Layer
Objectives: The ‘immediate’ and 6-month ‘aged’ micro-tensile bond strength (μTBS) of universal adhesives was measured with/without an additional adhesive layer applied on a separately light-cured or non-cured universal adhesive.
Methods: Eighty human third molars were randomly assigned to 8 experimental groups. The universal adhesives Single Bond Universal (3M) and Clearfil Universal Bond (Kuraray Noritake) were used in self-etch mode (following the manufacturer’s directions), and either light-cured or not before application of an extra hydrophobic adhesive layer (‘Clearfil SE Bond’ bond, Kuraray Noritake). The 2-step self-etch adhesives Clearfil SE Bond (Kuraray Noritake) and OptiBond XTR (Kerr) were used as control (applied following the manufacturer’s directions). After composite build-ups were bonded to mid-coronal occlusal dentin surfaces, specimens were stored in water (37°C/24h) and sectioned into micro-specimens (1.0 mm2). Half of the specimens were immediately subjected to μTBS testing (1.0 mm/min), while the other half was stored in water (37°C) for 6 months prior to testing. Failure analysis was performed using stereo-microscopy and SEM. Data were analyzed with ANOVA and Tukey test (p=0.05).
Results: Clearfil SE Bond and OptiBond XTR exhibited a significantly higher immediate and aged μTBS to dentin than the universal adhesives (p<0.05). The immediate μTBS was alike for the universal adhesives when applied following the different application modes (p>0.05). Application of an extra hydrophobic adhesive layer increased the aged μTBS of the universal adhesives, which became statistically significant when the universal adhesives were beforehand light-cured (p<0.05).
Conclusions: The bond durability of universal adhesives, applied in self-etch mode, was found to benefit from the application of an extra hydrophobic adhesive layer when the universal adhesive was before light-cured.
Methods: Eighty human third molars were randomly assigned to 8 experimental groups. The universal adhesives Single Bond Universal (3M) and Clearfil Universal Bond (Kuraray Noritake) were used in self-etch mode (following the manufacturer’s directions), and either light-cured or not before application of an extra hydrophobic adhesive layer (‘Clearfil SE Bond’ bond, Kuraray Noritake). The 2-step self-etch adhesives Clearfil SE Bond (Kuraray Noritake) and OptiBond XTR (Kerr) were used as control (applied following the manufacturer’s directions). After composite build-ups were bonded to mid-coronal occlusal dentin surfaces, specimens were stored in water (37°C/24h) and sectioned into micro-specimens (1.0 mm2). Half of the specimens were immediately subjected to μTBS testing (1.0 mm/min), while the other half was stored in water (37°C) for 6 months prior to testing. Failure analysis was performed using stereo-microscopy and SEM. Data were analyzed with ANOVA and Tukey test (p=0.05).
Results: Clearfil SE Bond and OptiBond XTR exhibited a significantly higher immediate and aged μTBS to dentin than the universal adhesives (p<0.05). The immediate μTBS was alike for the universal adhesives when applied following the different application modes (p>0.05). Application of an extra hydrophobic adhesive layer increased the aged μTBS of the universal adhesives, which became statistically significant when the universal adhesives were beforehand light-cured (p<0.05).
Conclusions: The bond durability of universal adhesives, applied in self-etch mode, was found to benefit from the application of an extra hydrophobic adhesive layer when the universal adhesive was before light-cured.