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Polyalkylimide hydrogel fillers can cause complications years after implantation. Histology reveals material degeneration and calcification, with immune cell presence correlating to inflammatory responses, suggesting long-term degradation impacts biocompatibility.

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Area of Science:

  • Biomaterials science
  • Dermatology
  • Plastic surgery

Background:

  • Polyalkylimide hydrogel is intended as a permanent, biocompatible subdermal filler.
  • Clinical complications arise years after subcutaneous implantation of this material.

Purpose of the Study:

  • To investigate the long-term changes in subdermal polyalkylimide hydrogel fillers.
  • To understand the relationship between material degradation and clinical outcomes.

Main Methods:

  • Histologic examination of extruded filler material from 34 patients.
  • Evaluation of tissue response and material condition.

Main Results:

  • Material degeneration and calcification were observed in all patients.
  • Absence of immune cells in most cases suggests biocompatibility, but acute inflammation showed giant cell invasion.
  • Chronic complaints correlated with neutrophilic cell influx.
  • Polyalkylimide hydrogel undergoes significant macroscopic and microscopic changes over time.

Conclusions:

  • Dermal filler assessment requires evaluating long-term degradation, not just initial biocompatibility.
  • The degradation process significantly influences the clinical performance and patient outcomes of polyalkylimide hydrogel fillers.