- 医療機器学 (ISSN:18824978)
- vol.84, no.5, pp.537-542, 2014 (Released:2015-01-23)
The purpose of this study is to assess airborne contamination of the dental operating room (DOR) in order to evaluate the risk of infection for the patients and dental staff. To examine DOR, a total of 744 air samples (0.01 Cubic Feet) collected in the particle counter hourly in 24 times a day for 31 days was used. Further, we investigated the change in the particle during tooth preparation (TP) with a highspeed hand-piece when using or not suction device. The results were as follows: 1) In almost all time from 9:00 to 17:00, the number of 1.0μm, 2.0μm and 5.0μm particles in the treatment days (20 days), were significantly (Welch’s t-test, p<0.05) greater than the closing office day (11 days). 2) The particle of 0.3μm, 0.5μm, 1.0μm, 2.0μm and 5.0μm during TP as compared to before TP, increased by 7.5 times, 50.0 times, 158.9 times, 144.6 times and 47.7 times, respectively. When using the intra-oral suction(IOS), these particles were remarkably reduced. When using the IOS and the extra-oral suction (EOS), 2.0μm and 5.0μm particles were further reduced to the level before TP, and were significantly (paired t-test, p<0.05) reduced compared to IOS alone.