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The platelet phase, the second stage of hemostasis, commences around 15-20 seconds after an injury. It follows and overlaps with the vascular phase, during which blood vessels constrict to minimize blood loss.
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After a fibrin clot is formed, the next step is clot retraction, a vital process facilitated by platelet contractile proteins, such as actin and myosin. These proteins pull the fibrin strands closer together and condense the clot. This action reduces the size of the clot, creating a smaller, denser structure that effectively seals off the damaged vessel. Clot retraction consolidates the clot and helps with wound healing by bringing the edges of the damaged blood vessel closer together.
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The cell fragments known as platelets are disc-shaped, with an average diameter of about 3 μm and a thickness of roughly 1 μm. They play a crucial role in the body's vascular clotting system, which also involves plasma proteins, blood cells, and blood vessel tissues.
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Updated: Jul 10, 2025

Characterization of Leukocyte-platelet Rich Fibrin, A Novel Biomaterial
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Extended platelet-rich fibrin.

Richard J Miron1,2, Michael A Pikos3, Nathan E Estrin1

  • 1Advanced PRF Education, Jupiter, Florida, USA.

Periodontology 2000
|November 21, 2023
PubMed
Summary

A novel heating process transforms platelet-rich fibrin (PRF) into extended-PRF (e-PRF), a regenerative biomaterial with a 4-6 month resorption period. This enhanced e-PRF shows promise as a collagen membrane alternative in dentistry and orthopedics.

Keywords:
albumin‐gelbio‐PRFbio‐fillerbio‐heatplatelet‐rich fibrin

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Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Periodontology and Implant Dentistry

Background:

  • Platelet-rich fibrin (PRF) is a regenerative biomaterial with a short resorption period of 2-3 weeks.
  • There is a clinical need for longer-lasting regenerative materials in various medical and dental applications.

Purpose of the Study:

  • To review the scientific literature on extended-PRF (e-PRF) technology, a novel heated PRF variant.
  • To summarize the preclinical and clinical findings on e-PRF's properties and applications.
  • To explore the potential of e-PRF as a substitute for collagen membranes and as a regenerative filler.

Main Methods:

  • Systematic literature review using keywords: Bio-Heat, albumin gel, albumin-PRF, Alb-PRF, extended-PRF, e-PRF, activated plasma albumin gel, APAG.
  • Databases searched: MEDLINE, EMBASE, PubMed.
  • Inclusion of preclinical studies (ISO 10993) and clinical case studies.

Main Results:

  • A 10-minute heating process transforms liquid albumin into a gel, extending resorption to at least 4 months (ISO 10993 preclinical data).
  • Clinical studies demonstrate e-PRF membrane use as a substitute for collagen membranes in guided bone regeneration (GBR), sinus lifts, and recession coverage.
  • Alb-PRF shows potential as an injectable filler for joint injections, osteoarthritis, and facial aesthetics due to its extended duration.

Conclusions:

  • The novel Alb-PRF/e-PRF technology significantly improves stability and degradation properties compared to traditional PRF.
  • e-PRF shows widespread potential as a cost-effective, natural alternative to collagen membranes in various dental and orthopedic procedures.
  • Further research into Alb-PRF/e-PRF is encouraged for its application as a regenerative filler and biomaterial.