Impact of Immediate Dentin Sealing With Various Universal Adhesives on Shear Bond Strength of Dual-Cure Resin Cement.

OBJECTIVES: This study evaluated the effect of universal adhesives (UAs) applied as Immediate Dentin Sealing (IDS) on the shear bond strength (SBS) of dual-cure resin cement, both immediately and after thermocycling aging. MATERIAL AND METHODS: A total of 180 bovine incisors were prepared and randomly assigned to six groups (n = 15): NOC (control), Clearfil Universal Bond Quick (CUBQ), G-Premio Bond (GPB), Peak Universal Bond (PUB), Adhese Universal (AU), and Scotchbond Universal Plus (SBUP). Specimens were cemented with dual-cure resin cement (Panavia V5) and subjected to SBS testing at 24 h and after thermocycling (10,000 cycles, 5 degrees C-55 degrees C). SBS was measured using a universal testing machine, and failure modes were assessed microscopically. Statistical analysis was conducted using a Generalized Linear Model with Bonferroni correction (p < 0.05). RESULTS: Significant differences were found among UAs (p < 0.001) and after aging (p < 0.001). SBUP and GPB had the highest SBS before and after thermocycling, while NOC had the lowest. Thermocycling reduced SBS in all groups, with CUBQ and AU showing the largest declines. Failure mode analysis showed predominantly adhesive failures in NOC, while IDS groups had more cohesive and mixed failures. CONCLUSION: IDS technique with universal adhesives significantly enhances bond strength to dentin compared to conventional cementation. SBUP and GPB showed superior bonding performance, likely due to their monomer formulations containing 10-MDP and acetone, which are known to improve chemical adhesion to dentin and promote effective resin infiltration. Thermocycling led to a reduction in SBS across all groups, highlighting the impact of aging on adhesive durability, underscoring the importance of selecting UAs with lasting adhesive strength for long-term bonding.