Colloidal platinum nanoparticles enhance resin-dentin bonding durability.

Area of Science:

• Biomaterials Science
• Dental Materials Science
• Nanotechnology in Dentistry

Background:

• Dental adhesives are crucial for restoring teeth.
• Durability of resin-dentin bonds is a significant clinical challenge.
• Nanoparticles offer potential for improving adhesive performance.

Purpose of the Study:

• To evaluate the effect of colloidal platinum nanoparticles (CPN) on the long-term durability of resin-dentin bonds.
• To assess CPN's impact on microtensile bond strength (µTBS) with different adhesive systems.
• To investigate the ultra-morphological changes in the hybrid layer after CPN application.

Main Methods:

• Sixty human premolars were tested for µTBS using Clearfil Megabond 2 (MB2), Scotchbond Universal Plus Adhesive (SUP) in self-etch (SE) and etch-and-rinse (ER) modes.
• CPN was applied to dentin before adhesive application in MB2 and SE-SUP groups.
• µTBS was evaluated at 24 hours, 6 months, and 1 year, with fracture analysis via SEM and ultra-morphology via TEM/STEM/EDX.

Main Results:

• CPN application significantly inhibited the decrease in µTBS for MB2 and SE-SUP groups over time.
• No significant bond strength reduction was observed in the ER-SUP group with or without CPN.
• TEM/STEM/EDX revealed CPN adhering to collagen fibrils in the hybrid layer, even after aging.

Conclusions:

• Colloidal platinum nanoparticles show promise in enhancing the longevity of resin-dentin bonding, particularly with self-etch adhesives.
• CPN integration into adhesive systems may improve the long-term clinical performance of dental restorations.
• Nanoparticle interaction with collagen fibrils contributes to improved bond durability.