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Development of electrophoretic co-deposition of bioactive and antibacterial ceramics with biodegradable polymers to produce novel composite coatings for biomedical applications

Subject Area Biomaterials
Term from 2019 to 2023
Project identifier Deutsche Forschungsgemeinschaft (DFG) - Project number 426494347
 
Final Report Year 2024

Final Report Abstract

The deposition of novel biodegradable coatings with tailored bioactivity and antibacterial activity on metallic biomaterials for applications as dental and orthopedic implants is of high medical relevance in order to minimize the risk of complications after implantation and to limit the use of antibiotics. One of the most widely used metals in the dental and orthopedic fields is commercially pure titanium (CP-Ti) due to its high corrosion resistance and biocompatibility. In recent years metastable-β and β Ti alloys, such as Ti-13Nb-13Zr are also gaining increasing attention for biomedical applications due to their mechanical properties close to bone and their non-toxic behaviour in contact with the human body. However, Ti and its alloys exhibit bioinert properties and their osteoinductive capabilities have to be improved, e.g., by applying bioactive and biodegradable coatings on their surface. Among different coating techniques, electrophoretic deposition (EPD) can be used with a great variety of materials to deposit films on different three-dimensional substrates at room temperature. The coating microstructure and thickness can be controlled by varying the chemical composition of the suspension, the applied potential and the deposition time. Thus, the current project focuses on developing composite polymerbased coatings, incorporating various antibacterial agents on CP Ti and near-β Ti-13Nb-13Zr alloy using EPD. Zein, chitosan and alginate were selected as coating matrices, while different sol-gel derived bioactive glass particles or nanocrystalline hydroxyapatite (HA) and/or silicon nitride (Si3N4) and/or graphene oxide (GO) and/or copper oxide (CuO) were added as inorganic antibacterial agents in the coatings. The results of the project contribute to the development of novel multicomponent coatings by systematic investigation of key EPD parameters, including the suspension stability, the electrokinetic properties of particles in different electrolytes and the deposition mechanisms. Moreover, new knowledge was generated on the relation between the EPD process and selected properties of the final coatings, such as adhesion strength, micro-mechanical performance and biological activity. The obtained coatings can be considered as potentially suitable candidate materials for orthopedic and dental applications.

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