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Biomechanical Characterization of Human Soft Tissues Using Indentation and Tensile Testing
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Dermis mechanical behaviour after different cell removal treatments.

Mara Terzini1, Cristina Bignardi1, Carlotta Castagnoli2

  • 1DIMEAS, Politecnico di Torino, Cso Duca degli Abruzzi 24, 10129 Torino, Italy.

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|March 22, 2016
PubMed
Summary

This study compares NaOH and DMEM decellularization methods for human acellular dermal matrices (HADMs). Mechanical testing identified optimal treatment parameters for HADM scaffold regeneration in reconstructive surgery.

Keywords:
Decellularization treatmentHuman dermisStatic mechanical testsUltimate strainUltimate stressYoung's modulus

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Regenerative Medicine

Background:

  • Human acellular dermal matrices (HADMs) are crucial scaffolds in reconstructive surgery, facilitating autologous tissue regeneration.
  • Effective decellularization is vital for HADM integration, requiring cell removal while preserving extracellular matrix architecture.
  • Understanding the mechanical properties of decellularized HADMs is essential for optimizing treatment protocols.

Purpose of the Study:

  • To develop a methodology for analyzing the mechanical properties of HADMs post-decellularization.
  • To identify the optimal decellularization treatment method (NaOH vs. DMEM) and duration for HADMs.
  • To compare engineering and true mechanical values derived from uniaxial tensile tests.

Main Methods:

  • Comparison of two decellularization techniques: NaOH incubation (1-7 weeks) and DMEM incubation (1-7 weeks).
  • Uniaxial tensile testing of decellularized HADM specimens.
  • Analysis of stress-strain curves to calculate engineering and true mechanical values.

Main Results:

  • Mechanical testing identified optimal decellularization methods and durations for HADMs.
  • Differences between engineering and true values reached up to 84%.
  • Engineering values proved useful for comparative analysis, offering reliable indications with simpler experimental setups.

Conclusions:

  • The study provides a framework for selecting optimal decellularization parameters for HADMs based on mechanical properties.
  • Both NaOH and DMEM methods, with appropriate duration, can yield suitable HADM scaffolds.
  • Engineering stress-strain values offer a practical approach for comparing mechanical properties in decellularized matrices.