Journal
POLYMERS
Volume 15, Issue 17, Pages -Publisher
MDPI
DOI: 10.3390/polym15173586
Keywords
zinc oxide nanoparticles; 3D printing; digital light processing (DLP); antibacterial properties; UV curing; implants
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Digital Light Processing (DLP) is a 3D printing technique that is increasingly used in personalized medicine, such as creating medical devices. In this project, a resin of poly(ethylene glycol) diacrylate (PEGDA) was developed with excellent mechanical properties and high biocompatibility. Zinc oxide nanoparticles (ZnO NPs) were added to the resin, which showed strong antibacterial activity against Escherichia coli (E. coli) and Staphylococcus aureus (S.A.) without negatively affecting the material's mechanical properties.
Digital light processing (DLP) is a vat photopolymerization 3D printing technique with increasingly broad application prospects, particularly in personalized medicine, such as the creation of medical devices. Different resins and printing parameters affect the functionality of these devices. One of the many problems that biomedical implants encounter is inflammation and bacteria growth. For this reason, many studies turn to the addition of antibacterial agents to either the bulk material or as a coating. Zinc oxide nanoparticles (ZnO NPs) have shown desirable properties, including antibacterial activity with negligible toxicity to the human body, allowing their use in a wide range of applications. In this project, we developed a resin of poly(ethylene glycol) diacrylate (PEGDA), a cross-linker known for its excellent mechanical properties and high biocompatibility in a 4:1 weight ratio of monomers to water. The material's mechanical properties (Young's modulus, maximum elongation, and ultimate tensile strength) were found similar to those of human cartilage. Furthermore, the ZnO NPs embedding matrix showed strong antibacterial activity against Escherichia coli (E. coli) and Staphylococcus aureus (S.A.). As the ZnO NPs ratio was changed, only a minor effect on the mechanical properties of the material was observed, whereas strong antibacterial properties against both bacteria were achieved in the case of 1.5 wt.% NPs.
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