アブストラクト（32巻2号：The Bulletin of Kanagawa Dental College）

The Bulletin of Kanagawa Dental College

English

Title　： Study on the Bactericidal Effects of Chlorine Dioxide Gas - Application to disinfection of dental air-turbine handpieces -
Subtitle　： ORIGINAL ARTICLES
Authors　： Kazunari Kimoto1, Nobushiro Hamada2, Motofumi Ohno1, Miyuki Furuya1, Mamoru Kushida1, Shizuho Usui1, Shinji Toda1, Kazuaki Kawamura1, Hajime Okudera1, Yukio Hirata1, Toshio Umemoto2, Hirohisa Arakawa1
Authors（kana）　：
Organization　： 1Department of Dental & Public Health, Kanagawa Dental College, 2Department of Oral Microbiology, Kanagawa Dental College
Journal　： The Bulletin of Kanagawa Dental College
Volume　： 32
Number　： 2
Page　： 77-82
Year/Month　： 2004 / 9
Article　： Original article
Publisher　： Kanagawa Odontological Society
Abstract　： The purpose of this study was to evaluate the bactericidal effects of chlorine dioxide (ClO2) gas, which is used to sterilize dental air-turbine handpieces without the head section cartridges. Two handpieces smeared with bacterial solution were placed in a plastic (ethylene vinyl alcohol copolymer) bag sealed with a one-way valve, which was then filled with chlorine dioxide gas to a concentration of 9.0 ppm. The chlorine dioxide gas concentrations in the bag after 15 and 30 mins markedly decreased to 4.3 and 2.4 ppm, respectively. When the bags were filled with chlorine dioxide gas to a concentration of 12.5 ppm, the gas concentrations in the bag after 15 and 30 mins decreased slightly to 10.0 and 8.0 ppm, respectively. The bactericidal effects of chlorine dioxide gas on Escherichia coli NIHJ and Staphylococcus aureus IID1678 (MRSA) were investigated by placing dental air-turbine handpieces in bags sealed with a one-way valve. The bactericidal effects were observed with exposure times of 30 mins at an initial chlorine dioxide gas concentration of 12.5 ppm (the gas concentration was 8.0 ppm when the bag was opened). However, no bactericidal effects were observed with exposure times of 30 mins at an initial chlorine dioxide gas concentration of 9.0 ppm (the gas concentration was 2.4 ppm when the bag was opened). These results from the present study suggest that chlorine dioxide gas is useful for disinfecting dental air-turbine handpieces without head section cartridges and other intraoral instruments.
Practice　： Dentistry
Keywords　： Chlorine dioxide gas, Bag sealed with a one-way valve, Bactericidal effects, Escherichia coli, Methicillin-resistant Staphylococcus aureus (MRSA)