| Project/Area Number |
07672235
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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 Dentall College, Department of Dentistry, Lecturer,, 歯学部, 講師 (10163065)
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| Co-Investigator(Kenkyū-buntansha) |
TAKAKU Satoru Saitama College of Health Science, Assistant professor, 助教授 (80154764)
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| Project Period (FY) |
1995 – 1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 1996: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1995: ¥1,400,000 (Direct Cost: ¥1,400,000)
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| Keywords | Preventive measures of infection / Airborne bacterium / Environmental monitoring / Oral-streptococci / Infection control / Aerosol / Airborne vacuum cleaner / Environmental pollution |
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| Research Abstract |
Blood and drill dust from dental plaque microorganisms, teeth, and filling materials can cause environmental pollution in the dental clinic. Currently, as a preventive measure against air pollution from a patient's mouth during dental treatment. Detction 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-alpha-haemolytic streptococci according to the growth shown on Mitis-Salivarius agar disk, while 4.5% recognized on blood agar disk. But we could not find oral-alpha-streptococci from the airborne bacterium in the dental clinic's waiting room and in the research room.
It was proved that oral-alpha-haemolytic streptococci was useful as an indicator for splashing infection control in the present study. We tested the eliminating effects by the Extra-Oral Vacuum Aspirator (EOVA) with the plaque solution aerosol and the aerosol from drilling a tooth by examining the distribution of floating aerosol in the air turbine's tank when a plaque solution was sprayd and when a human tooth was drilled with a plaque solution. We concluded that infectious aerosol increases in diameter with the drilling of human teeth to the size of about 0.5-5.0 mum, which is microbiologically and hygienically hazardous and also can be inhaled without much difficulty.
In order to examine environmental pollution in the dental clinic during tooth preparation and operation area during scaling procedures using ultra sonic scaler. The EOVA was therefore viewed as an effective method for reducing air pollution in the dental clinic, and should be used when treating patients with certain infectious diseases. In tooth preparation with high-speed air turbines, tooth preparation dust from the patient's mouth is one risk for airborne infections.
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