Comparison study of the quantitative microbial air contamination in dental clinic: before and after improving air system at Charoenkrungpracharuk Hospital
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Abstract
COVID-19 has changed the health service system as well as the environmental management in dental clinics, especially the air-conditioning and ventilation systems. The purpose of this study was to compare the quantity of microorganisms in the air in dental clinics and related areas in 5 locations at 2 time periods: before and after improving the air conditioning and ventilation systems,classifying air quality according to the index of microbial air contamination, and finding the relationship between various variables to the amount of microbial air contamination. The microorganism samples were collected 2 times: before treatment (T0) and during treatment (T1) in the dental clinics and related areas, totaling 120 samples. It was found that microbial air contamination during T0 was compared before and after the improvement of the air system, in non AGP (aerosol generating procedure) room, radiographic room and waiting area after improving the air system the values decreased significantly (p < 0.05). The non AGP and radiographic rooms, it had an air quality index value from good to very good. The waiting area had an air quality index from poor to fair. As for microbial air contamination during T1 in non AGP and AGP rooms, after the improving the air system, there was a statistically significant decrease (p < 0.05), with both rooms having air quality index values from fair to good. The relationship between the variables was found that if the number of people in the area increased by 1 person, the amount of air microorganisms would increase by 2.26 units. It can be concluded that improving the air conditioning and ventilation systems could reduce the amount of microbial air contamination in the dental examination room during dental treatment and considered this together with limiting the number of people in the area
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