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The Quantification of Injectability by Mechanical Testing
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Material Science and Bioengineering Principles of Injectable Facial Fillers: Rheological Properties and Structural

Brett P Weiss1, Hana Shah1,2, Nicholas J Iglesias3

  • 1University of Miami Miller School of Medicine, Miami, FL.

The Journal of Craniofacial Surgery
|May 5, 2026
PubMed
Summary
This summary is machine-generated.

This review synthesizes the material science of injectable dermal fillers, linking composition to rheological performance and degradation. Understanding these principles is key for optimizing filler behavior and clinical outcomes in aesthetic medicine.

Keywords:
Aestheticsdermal fillershyaluronic acidrheology

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Area of Science:

  • Biomaterials Science
  • Aesthetic Medicine
  • Soft Tissue Engineering

Background:

  • Injectable dermal fillers are advanced soft-tissue biomaterials.
  • Filler performance is dictated by material properties, but structure-behavior relationships are not fully synthesized.
  • Current understanding of filler material science is fragmented across different filler classes.

Purpose of the Study:

  • To review the material science foundations of modern dermal fillers.
  • To link material parameters to in vivo filler behavior.
  • To establish a mechanistic framework for filler performance.

Main Methods:

  • Review of hyaluronic acid, collagen-based, and biostimulatory fillers (calcium hydroxylapatite, poly-L-lactic acid, polycaprolactone).
  • Emphasis on material parameters: polymer chemistry, crosslinking, microstructure, degradation kinetics.
  • Analysis of rheological characteristics (G', G″, cohesivity, injectability).

Main Results:

  • Material parameters directly influence rheological properties and in vivo behavior.
  • Rheological characteristics impact stability, tissue integration, and mechanical resistance.
  • Advanced formulations (e.g., multiphasic, microspheres) enhance durability and biocompatibility.

Conclusions:

  • A mechanistic framework connects filler composition to rheological performance and degradation.
  • Material science principles are foundational for understanding and optimizing filler behavior.
  • This review provides the scientific basis for clinical decision-making in Part B.