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Nanometer-scale features on micrometer-scale surface texturing: a bone histological, gene expression, and

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Nanoscale surface textures on implants significantly enhance early bone healing and nanomechanical properties compared to microscale textures alone. This suggests nanotopography improves the host-to-implant response for better osseointegration.

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Area of Science:

  • Biomaterials Science
  • Orthopedic Research
  • Surface Engineering

Background:

  • Surface modifications aim to accelerate bone apposition and osseointegration.
  • Micro- and nanoscale surface textures are key areas of investigation for dental and orthopedic implants.

Purpose of the Study:

  • To compare histological, nanomechanical, and gene expression properties of a microblasted (MB) surface with nanoscale texture versus a dual-acid etched (AA) surface with only microscale texture.
  • To evaluate the in vivo host-to-implant response in a rodent femur model.

Main Methods:

  • Histomorphometry, nanoindentation for nanomechanical properties, and gene expression analysis (RT-qPCR) were performed on MB and AA surfaces.
  • Samples were analyzed at 1, 2, 4, and 8 weeks post-implantation in a rodent femur model.

Main Results:

  • MB surfaces showed significantly higher hardness and elastic modulus than AA surfaces at all time points.
  • At 1 and 2 weeks, MB surfaces exhibited significantly higher expression of osteogenic genes (e.g., COL-1, OPN, RUNX-2, OCN) compared to AA surfaces.
  • Histomorphometric and gene expression differences were not significant at 4 and 8 weeks.

Conclusions:

  • Nanotopographical features on implant surfaces enhance the host-to-implant response compared to microtextured surfaces alone.
  • Early differences in osteogenic gene expression suggest nanotopography promotes osteoprogenitor differentiation and mineralization.
  • Surface texture, particularly the inclusion of nanotexture, plays a role in bone healing mechanisms around implants.