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Summary

This study introduces a new bio-inspired dental adhesive incorporating zinc and polydopamine. This novel formulation enhances bond durability and antibacterial properties, offering improved outcomes for restorative dentistry.

Keywords:
bio‐interfacedental adhesivemetal‐ion chelationpolydopaminesynergistic effect

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Area of Science:

  • Biomaterials Science
  • Dental Materials Science
  • Nanotechnology

Background:

  • Dental adhesives face challenges like bond degradation and biofilm formation.
  • Marine mussel adhesion and polydopamine's metal-binding properties inspire new biomaterials.
  • Existing dental adhesives require improvement in long-term stability and resistance to degradation.

Purpose of the Study:

  • To develop and evaluate a novel zinc- and polydopamine-based dental adhesive (Zn-PDA@SiO2).
  • To investigate the synergistic effects of zinc and polydopamine on adhesive properties.
  • To assess the antibacterial, biocompatibility, and bond stability of the new formulation.

Main Methods:

  • Preparation of Zn-PDA@SiO2 nanoparticles with varying zinc content.
  • Incorporation of Zn-PDA@SiO2 into a dental adhesive primer.
  • Evaluation of antibacterial activity, enzymatic inhibition, and in vitro/vivo biocompatibility.
  • Long-term bond strength testing using self-etch (SE) bonding mode.
  • Molecular dynamics simulations to analyze interfacial bonding.

Main Results:

  • The Zn-PDA@SiO2 adhesive demonstrated significant antibacterial potential and inhibited protease activity.
  • Superior biocompatibility and biosafety were observed in vitro and in vivo.
  • Adding 5 wt% 5 mM Zn-PDA@SiO2 to the primer substantially improved long-term bond stability.
  • The aged bond strength in SE mode was 1.9 times higher than the SE gold-standard adhesive.
  • Molecular dynamics confirmed stable covalent, coordinative (Zn-assisted), and hydrogen bonds at the interface.

Conclusions:

  • The bio-inspired Zn-PDA@SiO2 dental adhesive offers enhanced antibacterial properties and improved bond durability.
  • This novel formulation shows promising perspectives for advanced dental restorative applications.
  • The study highlights the potential of mussel-inspired materials in biomedical engineering.