Preventive method environmental oollution bv the air-borne bacteriain dentistry clinic.

由于空气清洁度取决于通风频率，因此在制定标准时对通风频率进行了修正。当根据美国联邦标准No.209 B、C、D、E洁净室中空气细菌的耐受浓度来评价牙科诊所中空气传播细菌的测量结果时，对于100，000级，耐受浓度为2.5 cfu/ft 3，而在所调查的牙科诊所中的浓度为1.4-32.8 cfu/ft 3。根据美国外科学会（1978）提出的容许浓度，被调查的牙科医院和牙科诊所中有70%被列为“污染手术”。根据日本医院设备协会（1998）的标准，大多数医院被归类为准清洁或一般清洁区。在与牙科治疗相关的空气清洁度分级中，可能需要对链球菌和链球菌的检出率（%）进行加权。根据这些加权标准，本研究中调查的所有牙科诊所均处于“不利状态”。采用菌斑溶液气雾剂对新型活性炭系统电动空气净化器的净化效果进行了测试。我们开发了一种将表面具有极高负电位的白色煤（在800°C或更高温度下燃烧获得的煤）的杀菌功能结合到HEPA过滤器型空气净化器中的装置，并在净化室中对其效果进行了模拟实验。对丝状真菌、凝固酶（-）葡萄球菌、非发酵性杆菌、金黄色葡萄球菌、芽孢杆菌、微粒菌、链球菌、革兰氏阴性杆菌>革兰氏阳性杆菌、革兰氏阳性球菌和α-溶血性链球菌的根除率均在90%以上。

Since the degree of air cleanness depends on the frequency of ventilation,correction fqr the frequency of ventilationwas performed in the establishment of standards. When results of measurement of air-borne bacteria in dental clinics were evaluated according to the tolerant concentration of air-hone bacteria in the U.S. Federal Standard No. 209 B, C, D, E clean rooms,the tolerant concentration was 2.5 cfu/ft3 for class 100,000 but the concentration in the investigated dental clinics was 1.4-32.8 cfu/'ft3. According to the tolerant concentrationproposedby theAmericanAssociationof Surgery (1978), 70%of the investigated dental dines and hospitals were classified as "contaminated surgery". According to the Standards of the JapanHospital Equipment Association (1998), most hospitals were classified as quasi-clean Or general clean areas. In the classification of the degree of air cleanliness associatedwith dental treatment, weighting of thedetectionrate (%) of aandgstreptococci maybenecessary. Accordingto thesestandardswithweighting,all dental clinics investigated in this study were "in an unfavorable state". We tested the eliminating effects by the new electric air cleaner within activated carbon systemwith the plaque solution aerosol . we developed an apparatus by incorporating the bactericidal function of white coal (coal obtained by burning at 800°C or more) with a very high minus potential on its surface into an HEPA filter-type air cleaner,and carried out amodel experiment on its effects in a clean booth. Good results were obtained with an eradication rate of 90% or more for filamentous fungi, coagulase (-) staphylococci, non-fer'mentative rods,Staphylococcus aureus, Bacillus sp, Microcossus sp, Streptococcus sp, Gram-negative rods> Gram-positive rods, Gram- positive cocci, and a-hemolytic streptococci.