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Production of Nanofibrillar Patterned Collagen for Tissue Engineering
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A Bottom-Up Approach Grafts Collagen Fibrils Perpendicularly to Titanium Surfaces.

Eloise P Miller1, Jonathan K Pokorski2, Leena Palomo3

  • 1Department of Biomedical Engineering, School of Engineering, Case Western Reserve University, Cleveland, Ohio 44106, United States.

ACS Applied Bio Materials
|January 13, 2022
PubMed
Summary

Researchers developed a novel method to covalently bond collagen nanofibrils to titanium surfaces. This technique mimics natural Sharpey's fiber-type interfaces, potentially improving dental implant integration.

Keywords:
biomimetic transaminationcollagennanostructuressurface chemistrytitanium

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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Biomedical Engineering

Background:

  • Current titanium dental implants rely on osseointegration, leading to ankylosis and limiting natural tooth mobility.
  • A biomimetic interface, mimicking Sharpey's fibers, could enhance implant integration and function.
  • Collagen fibrils projecting perpendicularly from titanium surfaces are desirable for improved bio-interface.

Purpose of the Study:

  • To present a proof-of-concept for creating upright-standing collagen nanofibrils covalently bonded to titanium.
  • To establish a method for robust collagen attachment, mimicking natural connective tissue interfaces.
  • To lay the groundwork for developing synthetic ligaments for enhanced dental implant functionality.

Main Methods:

  • Titanium surface activation via plasma discharge treatment.
  • Functionalization with oxyamine-terminated silane coupling molecules.
  • Conversion of type I collagen N-termini to ketones using Rapoport's salt for oxime linkage formation with silanes.

Main Results:

  • Successful immobilization of collagen monomers onto the functionalized titanium surface via oxime linkages.
  • Formation of collagen fibrils from the covalently bonded monomers.
  • Observation of numerous fibril-surface junctions using scanning electron microscopy across multiple surfaces.

Conclusions:

  • A novel method for covalently bonding collagen nanofibrils to titanium surfaces has been demonstrated.
  • This technique provides a foundation for creating biomimetic interfaces, potentially improving dental implant osseointegration.
  • The developed method paves the way for engineering high-density collagen features for applications like synthetic ligaments.