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Methods of Medium Optimization01:28

Methods of Medium Optimization

Optimizing growth media enhances microbial proliferation and maximizes product yield. Statistical experimental design methodologies provide structured and reproducible approaches, offering progressively higher levels of robustness and efficiency.The One-Factor-at-a-Time (OFAT) MethodThe One-Factor-at-a-Time (OFAT) method involves adjusting a single variable while keeping all others constant. However, it cannot detect interactions between variables, often leading to suboptimal outcomes when...

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A Facile and Eco-friendly Route to Fabricate PolyLactic Acid Scaffolds with Graded Pore Size
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Optimization of 3D printing parameters for PLGA/HA scaffolds using the Taguchi method.

Kamal Gautam1, Hector Gomez Jimenez2, Yusuf Dikici3

  • 1Department of Mechanical and Aerospace Engineering, Case Western Reserve University, Cleveland, OH, USA.

Journal of the Mechanical Behavior of Biomedical Materials
|March 8, 2026
PubMed
Summary

Optimizing fused filament fabrication parameters for poly(lactic-co-glycolic acid)/hydroxyapatite (PLGA/HA) bone scaffolds significantly enhances mechanical properties. These improved 3D printed scaffolds show promise for bone tissue regeneration applications.

Keywords:
3D printingBone scaffoldsDifferential scanning calorimetery (DSC)In vitro degradationMechanical performancePLGA/HATaguchi method

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Area of Science:

  • Biomaterials Science
  • Additive Manufacturing
  • Tissue Engineering

Background:

  • Poly(lactic-co-glycolic acid)/hydroxyapatite (PLGA/HA) is a key material for 3D printed bioresorbable bone scaffolds.
  • The impact of fused filament fabrication (FFF) parameters on PLGA/HA scaffold mechanical performance and stability is not well understood.
  • Investigating the effects of printing parameters on mechanical properties and degradation is crucial for clinical applications.

Purpose of the Study:

  • To optimize FFF parameters for PLGA/HA bone scaffolds.
  • To evaluate the influence of printing parameters on monotonic and cyclic mechanical properties.
  • To assess the dimensional stability and mechanical evolution under simulated physiological conditions.

Main Methods:

  • Utilized a Taguchi L9 orthogonal array to study layer height, nozzle temperature, print speed, and cooling fan speed.
  • Performed flexural property testing, differential scanning calorimetry (DSC), and fatigue testing.
  • Conducted in-vitro degradation studies in phosphate-buffered saline (PBS) at 37°C over 60 days.

Main Results:

  • Optimal parameters (0.12 mm layer height, 205°C nozzle temperature) increased flexural strength and modulus by 20% and 50% at 50% porosity.
  • Significant effects of printing parameters were observed on glass transition, cold crystallization, and crystallinity.
  • Fatigue testing revealed an endurance limit of 1.2 MPa at 10^6 cycles; scaffolds showed 76% strength and 65% modulus decrease after 60 days degradation but remained suitable for bone regeneration.

Conclusions:

  • Optimized FFF parameters significantly improve the mechanical properties of PLGA/HA bone scaffolds.
  • Scaffolds printed with optimized parameters exhibit suitable mechanical performance for partial load-bearing bone regeneration.
  • Further investigation into degradation behavior and long-term stability is warranted for clinical translation.