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Synthetic scaffold morphology controls human dermal connective tissue formation
Hongjun Wang1, Jeroen Pieper, Fabienne Péters
1Institute of Biomedical Technology, Twente University, Enschede, The Netherlands.
Journal of Biomedical Materials Research. Part A
|July 20, 2005
Summary
Optimizing scaffold geometry, specifically thickness and pore size, is crucial for effective connective tissue engineering. This study identified ideal parameters for polyethylene glycol terephthalate/polybutylene terephthalate (PEGT/PBT) scaffolds to ensure uniform tissue formation.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Regenerative Medicine
Background:
- Scaffold surface overgrowth hinders nutrient diffusion and cell proliferation in bioreactor-based tissue engineering.
- Optimizing scaffold morphology is essential to overcome limitations in nutrient transport and promote uniform tissue development within engineered constructs.
Purpose of the Study:
- To optimize scaffold morphology and determine ideal geometric parameters for connective tissue engineering.
- To prevent disproportionate surface tissue formation and ensure uniform tissue ingrowth within scaffolds.
Main Methods:
- Compared various scaffold materials including collagen, PEGT/PBT copolymer, and hybrid scaffolds, selecting PEGT/PBT for optimization.
- Utilized scanning electron microscopy (SEM), microcomputed tomography, and flow permeability measurements to characterize scaffold geometry.
- Seeded and cultured fibroblasts under dynamic flow conditions for 2 weeks, assessing cell proliferation and tissue distribution via DNA assays and histological staining.
Main Results:
- Scaffolds of 1.5 mm thickness exhibited complete top-to-bottom tissue bridging, unlike thicker scaffolds with limited ingrowth.
- Optimal pore size for tissue bridging was found to be less than or equal to 401 ± 60 micrometers for fibrous scaffolds and 273 ± 55 micrometers for 3D-deposited scaffolds.
- Intermediate interconnectivity (average pore size of 160 ± 56 micrometers) in PEGT/PBT scaffolds led to homogenous tissue formation and complete pore filling.
Conclusions:
- Dynamic culture of PEGT/PBT scaffolds with specific geometric parameters (1.5-1.6 mm thickness, 90-360 microm pore size range, 160 ± 56 microm average interconnecting pore size) effectively promotes connective tissue formation within 14 days.
- Optimized scaffold geometry ensures uniform tissue ingrowth and complete void space filling, crucial for successful tissue engineering applications.
