病院歯科診療室における粉塵の粒度分布と気菌濃度の関連性  [in Japanese] The Relationship between Distribution of Dust Grain Sizes and Airborne Bacteria in Dental Hospital of University  [in Japanese]

    • 可児 徳子 KANI Tokuko
    • 朝日大学歯学部社会口腔保健学教室 Department of Community Oral Health, Asahi University School of Dentistry
    • 小澤 亨司 OZAWA Kohji
    • 朝日大学歯学部社会口腔保健学教室 Department of Community Oral Health, Asahi University School of Dentistry

    • 廣瀬 晃子 HIROSE Akiko
    • 朝日大学歯学部社会口腔保健学教室 Department of Community Oral Health, Asahi University School of Dentistry
    • 可児 瑞夫 KANI Mizuo
    • 朝日大学歯学部社会口腔保健学教室 Department of Community Oral Health, Asahi University School of Dentistry

Abstract

病院歯科診療室の粉塵の粒度分布の把握と,粉塵濃度と気菌濃度ならびに気候環境因子との関連性を検討する目的で,4診療室と屋外において2年間にわたり測定を行った。分析項目は1.診療室の粉塵濃度の経時的推移と粒度分布および屋外粉塵との関係,2.粒度別粉塵濃度と気菌濃度の相関分析,3.粒度別粉塵と気候環境因子の偏相関分析,4.重回帰式による気菌濃度推定における粉塵因子の影響についてである。その結果,次のような成績が得られた。1.診療室の総粉塵濃度は屋外よりもやや高く,季節変動は屋外と類似し,時間変動は診療時間中に高くなる傾向が認められた。診療室と屋外の粉塵の粒度別割合は,いずれも0,3〜1.0μmの比較的小さな粒度範囲で98%以上を占めたが,5.0μm以上は診療室で高い割合を示した。2.浮遊細菌は2.0μm未満,落下細菌は2.0μm以上の粉塵と相関性の高い傾向を示した。3.粉塵濃度とエアコン稼働因子は,広い粒度範囲の粉塵と高い負の相関関係が認められ,粉塵対策におけるエアコン稼働の有用性が示唆された。4.気候環境因子に粉塵因子を加えた重回帰式による気菌濃度推定は,高い精度が得られ,粉塵因子は気菌濃度の即時推定において精度を向上させるのに有用であることが示された。

In order to identify the distribution of dust grain sizes in a dental hospital and to estimate the relationship between the distribution of dust and airborne bacteria or environmental factors, measurements were carried out in the middle-size clinics (pedodontics and orthodontics) and the large clinics (restoration and prosthetics) at Asahi University Dental Hospital for two years (1994 and 1995). We measured dust grain sizes of 0.3, 0.5, 1.0, 2.0, above 5.0μm, airborne bacteria with an SY type pinhole sampler method and Koch's dropping method, and environmental factors (temperature, humidity, air flow, and number of persons, opened windows, and functioning outlets air-conditioning). Correlation between the distribution of each dust grain size and each measured factor was analysed. The estimation of airborne bacteria colonies was performed with the environmental factors and/or dust factor by multipule regression analysis, and the effect of addition of a dust factor was evaluated. The following results were obtained : 1. Total dust (above 0.3 μm) was higher inside the clinics than outdoors, and showed a tendency to be high during working times. 2. More than 98% of dust grains were 0.3-1.0 μm, but large grains of above 5.0 μm were found at a higher rate inside the clinics than outdoors. 3. A high correlation was obtained between dust of under 2.0 μm and floating airborne bacteria, and between dust of above 2.0 μm and dropping airborne bacteria. 4. The factor of operating air-conditioning had a high negative correlation to dust factor, and it was recognized that air-conditioning decreased the dust in clinics. 5. The estimated accuracy of airborne bacteria colonies by multipule regression analysis was increased by adding the dust factor to the environmental factors. As a result, we recognize that large dust grains float in dental clinics and increasing dust volume increases the airborne bacteria. The measurement of dust is useful to estimate airborne bacteria colonies in real time, and is useful for simple air pollution monitoring.

Journal

口腔衛生学会雑誌   [List of Volumes]

口腔衛生学会雑誌 46(5), 707-722, 1996-10-30  [Table of Contents]

The Japanese Society for Dental Health

References:  33

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Codes

  • NII Article ID (NAID) :
    110004017553
  • NII NACSIS-CAT ID (NCID) :
    AN00081407
  • Text Lang :
    JPN
  • Article Type :
    Journal Article
  • ISSN :
    00232831
  • Databases :
    CJP  CJPref  NII-ELS 

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