Resin Loaded with Nanoparticles and Remineralizing Agents on the Bond Integrity and Microleakage of Tooth Color Restoration Bonded to the Bleached Enamel Surface

Abstract

Aims: Assessment of remineralizing agent-modified resin adhesives i.e., Nanoparticles of amorphous calcium phosphate (NACP), Casein phosphopeptide-amorphous calcium phosphate (CPP- ACP), and Sodium Fluoride (NaF) on the shear bond strength (SBS) and microleakage of tooth color restoration bonded to the bleached enamel. Materials and Methods: Eighty premolar buccal enamel surfaces were bleached using a 10% carbamide peroxide gel. After 2 weeks samples were etched and then randomly allocated into four groups (n = 20) Group 1: No remineralizating agent + ER, Group 2: NaF + ER, Group 3: CPP-ACP + ER, and Group 4: NACP + ER. Composite restoration was performed followed by immersion in distilled water. Microleakage, SBS, and failure mode assessment were achieved. The mean and standard deviation (SD) of SBS and marginal sealing were compared using the Tukey post hoc test and One-way ANOVA. Results: Group 1 samples displayed the maximum value of marginal leakage. However, Group 4 samples exhibited the minimum scores of microleakage. Regarding SBS, Group 4 unveiled the highest outcomes of bond integrity. Whereas, Group 1 presented the lowest value of SBS. Conclusion: NACP-modified resin adhesives proved to be a better and safer alternative in improving the bond strength and microleakage scores of tooth color restorative material to bleached enamel.