치과진료 체어 수관 물 빼기 및 관련 요인이 치과 용수 세균 수에 미치는 영향

초록

Objectives: Water discharged from waterlines in dental units can cause cross-infection amongdental workers and patients by various mechanisms. Therefore, we analyzed the bacterial counts inthe water of dental unit chair waterlines, according to waterline flushing and related factors. Methods: A total of 58 dental hospitals located in a metropolitan city participated in this study between September 2019 and January 2020. Water was collected from a high-speed handpiece anda three-way syringe of a dental unit chair and transported to the experimental lab within 4 hours;bacterial plating colony counting was performed after culturing for 72 hours. In addition, a surveywas conducted with questions on the characteristics of hospitals, waterline flushing, and relatedfactors, such as water purification systems, regular filter replacement, and backflow preventionequipment. Results: The bacterial count in the water of the dental handpiece and three-way syringe in theinstitutions that performed waterline flushing was lower than that in the institutions that did not(P<0.001). When waterline flushing was performed on dental handpieces, the bacterial countwas found to be lower when regular filter replacement and backflow prevention equipmentwere combined. In addition, disinfection of waterlines had a significant effect on the bacterialcount when performed together with waterline flushing. However, for the three-way syringe,when waterline flushing was performed, no factors significantly affected the bacterial count. Conclusions: To reduce microbial contamination of dental water, flushing of dental unit waterlinescombined with regular filter replacement, backflow prevention equipment, and disinfection of waterlines may be effective in dental hospitals.

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