Bioactive calcium silicate/poly-ε-caprolactone composite scaffolds 3D printed under mild conditions for bone tissue...

Current research in tissue engineering seeks to develop scaffolds that support cell adhesion, proliferation, and differentiation. Traditional scaffolds often lack sufficient mechanical strength or bioactivity. While PCL is known for its biocompatibility, it lacks osteoconductive properties. Calcium silicate has shown bioactive potential but is difficult to process into 3D structures. This gap motivated the development of a composite scaffold that combines the mechanical stability of PCL with the bioactivity of calcium silicate. No prior work had resolved the challenge of 3D printing such a composite under mild conditions. Existing methods often require solvents or high temperatures, which may degrade the material or affect cell viability. The need for a solvent-free and low-temperature fabrication method remains unmet. This paper addresses the challenge of creating a bioactive and structurally stable scaffold for bone regeneration.

The study aimed to develop a 3D-printable composite scaffold using calcium silicate and PCL under mild conditions. The goal was to create a scaffold with both mechanical strength and bioactivity suitable for bone tissue engineering. The specific problem addressed was the difficulty in combining these two materials without using solvents or high temperatures. The motivation was to produce a scaffold that supports cell adhesion and osteogenic differentiation. The scaffold's performance was evaluated in terms of physicochemical properties and cell response. The study also aimed to assess how the addition of calcium silicate affects scaffold hydrophilicity and compressive strength. The researchers hypothesized that the composite would enhance osteogenic and angiogenic gene expression in WJMSCs. The ultimate purpose was to provide a promising material for bone tissue engineering applications.

The researchers used a solvent-free 3D printing method to fabricate composite scaffolds from varying ratios of calcium silicate (CS) and polycaprolactone (PCL). The scaffolds were analyzed for their physicochemical properties, including hydrophilicity and compressive strength. Scanning electron microscopy (SEM) and confocal microscopy were used to assess cell attachment and morphology. A colorimetric assay measured cell metabolic activity. Reverse transcription quantitative PCR (RT-qPCR) was performed to evaluate osteogenic and angiogenic gene expression in WJMSCs. The scaffolds were immersed in simulated body fluid to observe apatite formation. The study focused on the mechanical and biological performance of the composite material. The researchers examined how the addition of CS affected scaffold properties and cell behavior. The methods were designed to test the scaffold's suitability for bone tissue engineering applications.

The addition of calcium silicate significantly increased the hydrophilicity of the scaffolds. Compressive strength reached up to 5.8 MPa, indicating good mechanical stability. SEM images showed the formation of bone-like apatite on the scaffold surface after immersion in simulated body fluid. The scaffolds enhanced cell adhesion, proliferation, and differentiation of WJMSCs. Cell metabolic activity was higher on the CS/PCL composite compared to PCL alone. RT-qPCR results showed increased expression of osteogenic and angiogenic genes in cells cultured on the composite. The composite exhibited favorable bioactivity and osteoconductive properties. These findings suggest that the CS/PCL composite is a promising material for bone tissue engineering.

The CS/PCL composite scaffolds demonstrated improved hydrophilicity and mechanical strength. The scaffold supported the adhesion and differentiation of WJMSCs in vitro. The formation of bone-like apatite on the scaffold surface suggests good bioactivity. The composite enhanced osteogenic and angiogenic gene expression in cultured cells. These findings indicate that the CS/PCL composite has favorable properties for bone tissue engineering. The scaffold's performance was attributed to the addition of calcium silicate to PCL. The results support the use of this composite as a promising biomaterial for bone regeneration. The study provides evidence for the potential of this material in tissue engineering applications.