EDTA-functionalized silica nanoparticles as a conditioning agent for dentin bonding using etch-and-rinse technique

Area of Science:

• Biomaterials Science
• Dental Materials Science
• Nanotechnology

Background:

• Dentin bonding durability is crucial for long-term dental restorations.
• Current dentin conditioning agents may have limitations in promoting stable and durable bonds.
• Nanoparticles offer potential for developing advanced dental materials.

Purpose of the Study:

• To investigate ethylenediamine tetraacetic acid functionalized silica nanoparticles (EDTA-SiO2) as a novel dentin conditioning agent.
• To evaluate the efficacy of EDTA-SiO2 in improving dentin bond durability using an etch-and-rinse technique.

Main Methods:

• Synthesis and characterization of EDTA-SiO2 nanoparticles using FTIR, TGA, XPS, and TEM.
• Assessment of calcium ion chelation capacity using ICP-OES.
• Evaluation of dentin surface changes via SEM, TEM, and microhardness testing.
• Dentin bonding procedures using wet/dry techniques with a specific adhesive and composite resin.
• Durability assessment through microtensile bond strength, in-situ zymography, and nanoleakage testing.

Main Results:

• EDTA-SiO2 nanoparticles were successfully synthesized and confirmed to contain nitrogen and carboxyl groups.
• EDTA-SiO2 treatment resulted in extrafibrillar demineralization while preserving intrafibrillar minerals.
• Acceptable bond strength was achieved, with reduced matrix metalloproteinase activity and nanoleakage at the bonding interface.

Conclusions:

• EDTA-SiO2 is a feasible dentin conditioning agent capable of inducing extrafibrillar demineralization.
• This conditioning strategy effectively improves dentin bond durability.
• The developed SiO2-EDTA agent holds potential for clinical application to enhance restoration longevity.