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KMID : 1094720070120020136
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Biotechnology and Bioprocess Engineering
2007 Volume.12 No. 2 p.136 ~ p.139
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Sterilization effects of a TiO2 photocatalytic film against a Streptococcus mutans culture
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Kim Byung-Hoon
Kim Do-Man
Cho Dong-Lyun
Lim Sung-Hoon
Yoo So-Young
Kook Joong-Ki
Cho Yong-Ick
Ohk Seung-Ho
Ko Yeong-Mu
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Abstract
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Streptococcus mutans is one of the more significant pathogens involved in the development of dental caries in humans. The purpose of this research was to design a TiO2-coated dental instrument and to determine the bactericidal effects of the instrument onS. mutants. TiO2 photocatalytic films were prepared by the low-pressure metal-organic chemical vapor deposition (LPMOCVD) method using titanium tetraisopropoxide (TTIP) as precursor. The photocatalytic reaction was carried out on a TiO2-coated pyrex petri dish with an ultraviolet (UV) light emitting diode (LED) illuminator or a fluorescent lamp light source. Our data indicates that the relative survival ratio ofS. mutans when plated onto TiO2 photocatalytic films and under exposure to UV-A light for 15 min was 0.01%. In addition, a fluorescent lamp light source also had bactericidal effects on theS. mutans plated TiO2 photocatalytic films. These results indicate that TiO2-coated dental materials or devices may be useful in dental treatments for the prevention of carious or enamel demineralization.
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KEYWORD
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photocatalyst, Streptococcus mutans, sterilization, UVLED
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