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Photocatalytic antibacterial effect of TiO 2 film formed on Ti and TiAg exposed to Lactobacillus acidophilus
Author(s) -
Choi JungYoon,
Kim KyungHo,
Choy KwangChul,
Oh KeunTaek,
Kim KyoungNam
Publication year - 2007
Publication title -
journal of biomedical materials research part b: applied biomaterials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.665
H-Index - 108
eISSN - 1552-4981
pISSN - 1552-4973
DOI - 10.1002/jbm.b.30604
Subject(s) - lactobacillus acidophilus , photocatalysis , antibacterial activity , materials science , anatase , nuclear chemistry , rutile , titanium , irradiation , ultraviolet , chemistry , bacteria , organic chemistry , metallurgy , probiotic , biology , genetics , physics , optoelectronics , nuclear physics , catalysis
When irradiated under near‐ultraviolet (UV) light, TiO 2 exhibits strong bactericidal activity. The TiO 2 photocatalyst would be effective on orthodontic appliances after its antibacterial effect on the carcinogenic microorganism Lactobacillus acidophilus is evaluated. To compare the antibacterial effect of two crystalline forms of TiO 2 , rutile and anatase, thermal oxidation and anodic oxidation were employed to form each structure, respectively. The antibacterial effect of TiO 2 film on TiAg was also compared with that on Ti. Bacterial solutions were pipetted onto the TiO 2 ‐coated specimen and illuminated with UVA (2 × 15 W, black light, 356 nm) up to 100 min and the reaction solutions were incubated to count the colony‐forming units. The antibacterial activity of the coated specimens was similar to that of the uncoated group. The antibacterial activity of the coated specimens of TiAg was not different from that of Ti. TiO 2 coatings formed on both Ti and TiAg specimens did not exhibit cytotoxicity on the L‐929 cells of mice. © 2006 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2007