Photocatalytic antibacterial effect of TiO(2) film formed on Ti and TiAg exposed to Lactobacillus acidophilus.
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 x 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.
Choi
Jung-Yoon
JY
Department of Orthodontics, College of Dentistry, Yonsei University, Seoul, South Korea.
Kim
Kyung-Ho
KH
Choy
Kwang-Chul
KC
Oh
Keun-Taek
KT
Kim
Kyoung-Nam
KN
D000497:Alloys; D000900:Anti-Bacterial Agents / Q000494:pharmacology / Q000528:radiation effects; D003764:Dental Materials / Q000494:pharmacology / Q000528:radiation effects; D006801:Humans; D066298:In Vitro Techniques; D007779:Lactobacillus acidophilus / Q000187:drug effects*; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D009967:Orthodontic Appliances / Q000382:microbiology; D010084:Oxidation-Reduction; D010777:Photochemistry; D012834:Silver; D014025:Titanium / Q000494:pharmacology / Q000528:radiation effects; D014466:Ultraviolet Rays
D000497:Alloys; D000900:Anti-Bacterial Agents; D003764:Dental Materials; C009495:titanium dioxide; D012834:Silver; D014025:Titanium