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Related Experiment Videos

Shear force modulates osteoblast response to surface roughness.

S R Bannister1, C H Lohmann, Y Liu

  • 1Department of Periodontics, University of Texas Health Science Center, 7703 Floyd Curl Drive, San Antonio, Texas 78229-3900, USA.

Journal of Biomedical Materials Research
|February 9, 2002
PubMed
Summary
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Shear force alters osteoblast (bone cell) behavior on titanium implants, reversing reduced proliferation on rough surfaces. This indicates that implant surface topography significantly influences how cells respond to mechanical forces during osseointegration.

Area of Science:

  • Biomaterials Science
  • Cell Biology
  • Orthopedic Research

Background:

  • Osteoblasts (bone-forming cells) are sensitive to surface roughness, with proliferation decreasing and differentiation increasing on rougher titanium (Ti) surfaces.
  • During osseointegration, osteoblasts in vivo are exposed to shear forces, which can influence their response to implant surface characteristics.

Purpose of the Study:

  • To investigate how shear force modulates the response of osteoblast-like MG63 cells to varying surface topographies (smooth glass/PT, rough SLA/TPS Ti disks).
  • To determine the effects of different shear force levels (0-30 dynes/cm²) on cell proliferation, differentiation markers, and signaling molecules.

Main Methods:

  • MG63 cells were cultured on glass and Ti disks with defined roughness (PT, SLA, TPS).
  • Cells were subjected to controlled shear forces (0-30 dynes/cm²) in a flow device for 1 hour.

Related Experiment Videos

  • Cell number, alkaline phosphatase activity, osteocalcin, TGF-β1, and PGE2 levels were measured after 24 hours.

    • Main Results:

    • Shear force reversed the proliferation decrease on rough surfaces (SLA, TPS) but did not affect smooth surfaces (glass, PT).
    • Shear force reduced roughness-dependent increases in alkaline phosphatase activity and osteocalcin on rough surfaces, with maximal effects at 14 dynes/cm².
    • Prostaglandin E2 (PGE2) production significantly increased with shear force on all surfaces, with a pronounced effect on rough surfaces.

    Conclusions:

    • Osteoblastic response to shear force is significantly modulated by surface topography.
    • Increased PGE2 production under shear force on rough surfaces may contribute to the observed decrease in osteoblast differentiation.
    • Understanding these interactions is crucial for designing dental and orthopedic implants that promote effective osseointegration.