Antibacterial efficacy and cytotoxicity of low intensity direct current activated silver–titanium implant system prototype

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• 作者：Zhuo Tan ; Edward A. Havell ; Paul E. Orndorff ; Rohan A. Shirwaiker
• 关键词：Low intensity direct current ; Silver–titanium implant ; Orthopaedic application ; Antimicrobial efficacy ; Cytotoxicity
• 刊名：BioMetals
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：30
• 期：1
• 页码：113-125
• 全文大小：
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Biochemistry, general; Pharmacology/Toxicology; Microbiology; Cell Biology; Plant Physiology; Medicine/Public Health, general;
• 出版者：Springer Netherlands
• ISSN：1572-8773
• 卷排序：30

文摘

Silver-based devices activated by electric current are of interest in biomedicine because of their broad-spectrum antimicrobial activity. This study investigates the in vitro antibacterial efficacy and cytotoxicity of a low intensity direct current (LIDC)-activated silver–titanium implant system prototype designed for localized generation and delivery of silver ions at the implantation site. First, the antibacterial efficacy of the system was assessed against methicillin-resistant Staphylococcus aureus (MRSA) over 48 h at current levels of 3 and 6 µA in Mueller–Hinton broth. The cytotoxicity of the system was then evaluated over 48 h in two phases using an in vitro model with in which the activated electrodes were suspended in growth medium in a cell-seeded tissue culture plate. In phase-1, the system was tested on human osteosarcoma (MG-63) cell line and compared to titanium controls. In phase-2, the cytotoxicity characteristics were validated with normal human diploid osteoblast cells. The LIDC-activated system demonstrated high antimicrobial efficacy against MRSA, but was also toxic to human cells immediately surrounding the electrodes. The statistical analysis showed that the cytotoxicity was a result of the presence of silver, and the electric activation did not make it worse.