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ACS Appl Bio Mater ; 7(5): 2762-2780, 2024 05 20.
Artigo em Inglês | MEDLINE | ID: mdl-38629138

RESUMO

In the present study, we have discussed the influence of forging temperature (623 K (FT623), 723 K (FT723) and 823 K (FT823)) on microstructure and texture evolution and its implication on mechanical behavior, in vitro-in vivo biocorrosion, antibacterial response, and cytocompatibility of microalloyed Mg-Zr-Sr-Ce alloy. Phase analysis, SEM, and TEM characterization confirm the presence of Mg12Ce precipitate, and its stability was further validated by performing ab initio molecular dynamic simulation study. FT723 exhibits strengthened basal texture, higher fraction of second phases, and particle-stimulated nucleation-assisted DRX grains compared to other two specimens, resulting in superior strength with comparable ductility. FT723 also exhibits superior corrosion resistance mainly due to the strengthened basal texture and lower dislocation density. All the specimens exhibit excellent antibacterial behavior with Gram-negative E. coli, Gram-positive Staphylococcus aureus, and Pseudomonas aeruginosa bacteria. 100% reduction of bacterial growth is observed within 24 h of culture of the specimens. Cytocompatibility was determined by challenging specimen extracts with the MC3T3-E1 cell lines. FT723 specimen exhibits the highest cell proliferation and alkaline phosphatase activity (ALP) because of its superior corrosion resistance. The ability of the specimens to be used in orthopedic implant application was evaluated by in vivo study in rabbit femur. Neither tissue-related infection nor the detrimental effect surrounding the implant was confirmed from histological analysis. Significant higher bone regeneration surrounding the FT723 specimen was observed in SEM analysis and fluorochrome labeling. After 60 days, the FT723 specimen exhibits the highest bone formation, suggesting it is a suitable candidate for orthopedic implant application.


Assuntos
Ligas , Antibacterianos , Materiais Biocompatíveis , Teste de Materiais , Osteogênese , Antibacterianos/farmacologia , Antibacterianos/química , Ligas/química , Ligas/farmacologia , Osteogênese/efeitos dos fármacos , Animais , Materiais Biocompatíveis/química , Materiais Biocompatíveis/farmacologia , Camundongos , Zircônio/química , Zircônio/farmacologia , Testes de Sensibilidade Microbiana , Tamanho da Partícula , Diferenciação Celular/efeitos dos fármacos , Coelhos , Magnésio/química , Magnésio/farmacologia , Escherichia coli/efeitos dos fármacos , Pseudomonas aeruginosa/efeitos dos fármacos , Proliferação de Células/efeitos dos fármacos , Estrôncio/química , Estrôncio/farmacologia , Simulação de Dinâmica Molecular , Linhagem Celular , Temperatura
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