Amino Acid-Based Poly(ester urea) Biodegradable Membrane for Guided Bone Regeneration.

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Tissue Engineering

Background:

• Current barrier membranes (BM) for guided bone regeneration (GBR) are often collagen-derived, with variability in biocompatibility, strength, and degradation.
• Optimizing BM properties is crucial for effective osteogenic healing and preventing epithelial ingrowth.

Purpose of the Study:

• To design and evaluate a novel collagen-free barrier membrane (BM) using electrospun l-valine-co-l-phenylalanine-poly(ester urea) (PEU) for guided bone regeneration (GBR).
• To assess the mechanical properties, in vitro cell compatibility, and in vivo regenerative capacity of the PEU BM.

Main Methods:

• Electrospinning of PEU copolymer to create barrier membranes (BM).
• Assessment of mechanical properties (strength, elasticity) and degradation rates.
• In vitro studies using alveolar-bone-derived stem cells (AvBMSCs) to evaluate cytocompatibility and osteogenic potential.
• In vivo implantation in rats for inflammatory response, angiogenesis, and bone regeneration assessment in calvarial and periodontal defect models.

Main Results:

• PEU BM exhibited superior mechanical strength and elasticity compared to clinically used synthetic membranes.
• In vitro studies showed good cell viability, attachment, proliferation, and osteogenic gene expression.
• In vivo implantation resulted in reduced inflammation, increased angiogenesis (CD31, VWF expression), and robust bone formation in calvarial defects.
• The PEU BM significantly enhanced alveolar bone and cementum regeneration in a periodontal model.

Conclusions:

• The electrospun PEU barrier membrane (BM) demonstrates excellent mechanical stability, cytocompatibility, and promotes significant bone formation in vitro and in vivo.
• This collagen-free PEU BM is a promising candidate for guided bone regeneration (GBR) in periodontal and craniofacial applications.