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Multifunctional Primer for Dentin Bonding via Biomimetic Mineralization.

S H Yang1, Z L Tian1, H M Wang2

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Aldehyde-grafted polyaspartate (PACA) enhances dental restoration durability by regulating biomimetic mineralization and collagen cross-linking. This innovative primer improves bond strength and longevity, offering a solution for dental adhesives.

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biomineralizationcollagencross-linking reagentsdental adhesiveshydroxyapatitesmatrix metalloproteinase inhibitors

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Area of Science:

  • Biomaterials Science
  • Dental Materials
  • Nanotechnology

Background:

  • Dentin bonding durability is a major challenge in dental restorations.
  • Current adhesive systems often degrade over time, compromising restoration longevity.
  • Biomimetic mineralization offers a potential strategy to enhance dentin bonding integrity.

Purpose of the Study:

  • To introduce aldehyde-grafted polyaspartate (PACA) as a novel agent for spatiotemporal control of biomimetic mineralization.
  • To investigate PACA's ability to cross-link collagen and induce intrafibrillar mineralization.
  • To evaluate PACA's efficacy as a single-component primer for improving dentin bonding durability.

Main Methods:

  • Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) to confirm collagen cross-linking.
  • Dynamic light scattering (DLS), zeta potential, and transmission electron microscopy (TEM) to study intrafibrillar mineralization.
  • Scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and atomic force microscopy (AFM) for remineralization evaluation.
  • Micro-tensile bond strength testing, nanoleakage analysis, and in situ zymography to assess bonding durability.

Main Results:

  • PACA effectively cross-links collagen fibrils and induces intrafibrillar mineralization, creating an amorphous calcium phosphate-rich microenvironment.
  • Mineralization within PACA-treated collagen forms an organized crystalline structure, encapsulating the polymer and collagen.
  • As a single-component primer, PACA simultaneously achieved collagen cross-linking, MMP inhibition, and enhanced adhesive penetration.
  • PACA significantly improved micro-tensile bond strength and demonstrated favorable durability after aging.

Conclusions:

  • PACA facilitates controlled biomimetic mineralization and collagen cross-linking, enhancing dentin bonding.
  • The multifunctional nature of PACA provides a promising strategy to overcome the durability limitations of conventional dental adhesive systems.
  • This approach offers a novel solution for long-lasting and robust dental restorations.