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Safety and efficacy of PLGA(Ag-Fe3O4)-coated dental implants in inhibiting bacteria adherence and osteogenic inducement under a magnetic field

Authors Yang Y, Ren S, Zhang X, Yu Y, Liu C, Yang J, Miao L

Received 14 December 2017

Accepted for publication 26 April 2018

Published 28 June 2018 Volume 2018:13 Pages 3751—3762


Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 2

Editor who approved publication: Dr Lei Yang

Yaping Yang,1,* Shuangshuang Ren,2,* Xuan Zhang,2 Yijun Yu,1 Chao Liu,3 Jie Yang,2 Leiying Miao1

1Department of Cariology and Endodontics, 2Department of Periodontology, 3Department of Orthodontics, Nanjing Stomatological Hospital, Medical School of Nanjing University, Nanjing, Jiangsu, China

*These authors contributed equally to this work

Introduction: The placement of dental implants is performed in a contaminated surgical field in the oral cavity, which may lead to implant failure. Bacterial adhesion and proliferation (Streptococcus mutans, Porphyromonas gingivalis) often lead to implant infections. Although Ag nanoparticles hold great promise for a broad spectrum of antibacterial activities, their runoff from dental implants compromises their antibacterial efficacy and potentially impairs osteoblast proliferation. Thus, this aspect remains a primary challenge and should be controlled.
Materials and methods: In this study, PLGA(Ag-Fe3O4) was modified on the implanted tooth surface and was characterized by transmission electron microscopy, X-ray diffraction, and Fourier transform infrared spectroscopy. The magnetic and antibacterial properties were also determined.
Results: Results showed that Ag successfully bonded with Fe3O4, and Ag-Fe3O4 not only exerted superparamagnetism but also exhibited antibacterial activity almost identical to silver nanoparticles (nano-Ag). The PLGA(Ag-Fe3O4) coating could significantly maintain the antibacterial activity and avoid bacterial adhesion to the implant. Compared with the blank control group, PLGA(Ag-Fe3O4) under magnetic field-coated samples had a significantly lower amount of colonized S. mutans (P<0.01). Osteoblast proliferation results showed that the coated samples did not exhibit cytotoxicity and could promote osteoblast proliferation as shown by MTT, alkaline phosphatase, and the nucleolar organizer region count.
Conclusion: We developed a novel Ag biologically compatible nanoparticle in this study without compromising the nano-Ag antibacterial activity, which provided continuous antibacterial action.

Keywords: Ag-Fe3O4, PLGA, dental implants, antibacterial property

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