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Related Experiment Videos

Bone formation over partially exposed implants using guided tissue generation.

B K Arora1, C M Worley, R L Guttu

  • 1Department of Oral and Maxillofacial Surgery, University of Alberta, Edmonton.

Journal of Oral and Maxillofacial Surgery : Official Journal of the American Association of Oral and Maxillofacial Surgeons
|October 1, 1992
PubMed
Summary
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This pilot study demonstrates that guided tissue regeneration using expanded polytetrafluoroethylene (e-PTFE) membranes can induce new bone formation on exposed implants. The study highlights the influence of membrane positioning on bone growth and the inherent bone-forming capacity of hydroxylapatite-coated implants.

Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Dental Implantology

Background:

  • Endosseous implants often experience partial exposure, necessitating strategies for bone regeneration.
  • Expanded polytetrafluoroethylene (e-PTFE) membranes are utilized in guided tissue regeneration.
  • Hydroxylapatite (HA) coatings are known to promote osseointegration.

Purpose of the Study:

  • To evaluate the efficacy of e-PTFE membranes in inducing new bone formation on exposed titanium and HA-coated implants.
  • To assess the influence of membrane placement on bone regeneration.
  • To compare bone formation on exposed HA-coated implants with and without membranes.

Main Methods:

  • A pilot study involving 20 titanium and 10 HA-coated implants placed in canine tibiae, with partial cervical exposure.

Related Experiment Videos

  • Application of e-PTFE membranes to cover the exposed implant portions in test groups.
  • Control groups received no membrane coverage.
  • Histological analysis at 6, 8, and 12 weeks post-implantation.

    • Main Results:

    • Implants covered with e-PTFE membranes exhibited progressive bone formation on the exposed surfaces.
    • Threaded titanium control implants showed limited new bone on exposed threads, but reactive bone nearby.
    • HA-coated control implants demonstrated significant new bone formation on the exposed portions.
    • Optimal bone formation occurred when a space was maintained between the membrane and implant; membrane collapse reduced bone growth.

    Conclusions:

    • Guided tissue regeneration with e-PTFE membranes effectively induces new bone over exposed implant surfaces.
    • The space between the membrane and implant critically influences the quantity of new bone formed.
    • Exposed HA-coated implants can regenerate bone even without a membrane, suggesting inherent osteoconductive properties.