Development of 3D-printed PLGA/TiO₂ nanocomposite scaffolds for bone tissue engineering applications

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Nanotechnology

Background:

• Poly lactic-co-glycolic acid (PLGA) is a biodegradable polymer widely used in tissue engineering.
• Enhancing the mechanical and biological properties of PLGA scaffolds is crucial for effective bone regeneration.
• Titanium dioxide (TiO2) nanoparticles offer potential benefits due to their biocompatibility and tunable properties.

Purpose of the Study:

• To develop and characterize 3D-printed porous scaffolds using a poly lactic-co-glycolic acid (PLGA)/TiO2 composite.
• To evaluate the impact of TiO2 addition on the mechanical, thermal, and surface properties of the scaffolds.
• To assess the in vitro biological performance of the PLGA/TiO2 scaffolds for bone tissue engineering applications.

Main Methods:

• 3D printing of porous PLGA/TiO2 composite scaffolds at a 10:1 weight ratio.
• Mechanical testing (compressive modulus), thermal analysis (DSC, TGA), and surface wettability measurements (contact angle).
• In vitro cell culture studies using osteoblasts to evaluate proliferation, alkaline phosphatase (ALP) activity, and calcium secretion.

Main Results:

• The addition of TiO2 nanoparticles significantly improved the compressive modulus of the PLGA scaffolds.
• TiO2 incorporation enhanced thermal stability, increasing both glass transition temperature and thermal decomposition onset.
• Scaffold wettability improved, evidenced by a reduced contact angle, favoring cellular attachment.
• PLGA/TiO2 scaffolds demonstrated significantly enhanced osteoblast proliferation, ALP activity, and calcium secretion compared to pure PLGA scaffolds (p < 0.05).

Conclusions:

• 3D-printed PLGA/TiO2 composite scaffolds exhibit improved mechanical, thermal, and surface properties compared to pure PLGA.
• The enhanced properties of PLGA/TiO2 scaffolds promote superior osteoblast response, including proliferation and differentiation.
• These findings suggest that PLGA/TiO2 composite scaffolds are promising materials for bone tissue engineering applications.