| Project/Area Number |
09672121
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
矯正・小児・社会系歯学
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| Research Institution | Tokyo Dental College |
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Principal Investigator |
SUYAMA Yuji Tokyo Dental College, DEPARTMENT OF DENTISTRY,LECTURER, 歯学部, 講師 (10163065)
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| Co-Investigator(Kenkyū-buntansha) |
NAKANE Tomoo Nihon University, LECTURER, 生産工学部・電気工学科, 専任講師 (30059878)
YAMADA Yuji Protection National Institute of Radiological Sciences, 内部被ばく・防護研究部, 主任研究官 (20166739)
SATORU Takaku Saitama College of Health, PROFESSOR, 歯科衛生科, 教授 (80154764)
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| Project Period (FY) |
1997 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥2,900,000 (Direct Cost: ¥2,900,000)
Fiscal Year 1999: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1998: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1997: ¥1,400,000 (Direct Cost: ¥1,400,000)
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| Keywords | infection control / air-born bacteria / aerosol / purification equipment / dust generation / standard / indoor environment / contamination / 医療施設 / 飛沫感染 |
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| Research Abstract |
Blood and drill dust from dental plaque microorganisms, teeth, and filling materials can cause environmental polllution in the dental clinic. Currently, as a preventive measure against air pollution from a patient's mouth during dental treatment. Detetion of oral streptococci in the air-borne is used as an index on the presence of aerosol in consequence of the use of tooth preparation with high-speed air turbines. The air-borne bacteria in the dental clinics consisted of Guram-positive cocci(33%), Guram-positive bacilli(37%), Myces(38%). We recognized 30.6% oral-α,γ-haemolytic streptococci according to the growth shown on Mitis-Sali varius agar disk, while 4.5% recognized on blood agar disk. But we could not find oral-α-γ haemolytic streptococci from the airborne bacterium in the denal clinic's waiting room and in the research room. Oral-α-γ haemolytic streptococci using Mitis Salivarius ager showed more efficiency as the index in monitoring droplet infection at dental treatments and pollution of the in-clinic environment, thus considered as an efficient procedure in detection environmental pollution in the dental clinic. With detection of oral-α-γ haemolytic streptococci two hours after tooth-drilling, necessity of monitoring on standing of air-borne bacteria was considered. We tested the eliminating effects by the air-cleaning system (CLEAN PARTITON) with the plaque solution aerosol and the aerosol from drilling a tooth by examing the distriution of floating aerosol in the air turbine's tank when a plaque solution was sprayed and when a human tooth was drilled with a plaque solution.
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