| Objective To explore the influence of water flow rate and flushing duration on the number of bacteria in the waterways of the oral comprehensive treatment table. Methods The oral cavity comprehensive treatment unit (DCU) of the Stomatology Department of Handan Central Hospital in Hebei Province was selected as the survey object, with a total of 20 chairs. Samples of three use gun water, high-speed mobile phone water and mouthwash water were collected using sterile test tubes and sterile straws. Samples were taken for six consecutive weeks. A total of 120 samples of mouthwash, 240 samples of three use gun water (120 for different water velocities and flows), 240 samples of high-speed mobile phone water before diagnosis (120 for different water velocities and flows) and 240 samples of high-speed mobile phone water during treatment were obtained (120 for normal water speed and 120 for maximum water speed), and the bacterial contamination of three use gun water, high-speed mobile phone water and mouthwash outlet pipes was detected and analyzed. Comparison was made on the number of bacteria in different flushing intervals (0~20 mL, 21~40 mL, 41~60 mL, 61~80 mL) of DCU mouthwash, the number of bacteria in different flushing periods (5, 10 s, 20 s, 30 s and 40 s) of three use gun water, and the amount of bacteria in flushing (2 mL, 4 mL, 6 mL, 8 mL and 10 mL) before diagnosis. The number of bacteria in different flushing time (5 s, 10 s, 20 s, 30 s, 40 s, 50 s and 60 s) and flushing volume (2 mL, 4 mL, 6 mL, 8 mL and 10 mL) of high-speed mobile phone water before diagnosis and treatment were compared. Results Before the diagnosis, the qualified rate of bacteria count in DCU mouthwash with 61-80 mL flushing volume was higher than that in 0-20 mL and 21-40 mL flushing volume, with statistically significant difference (P<0.05). The qualified rate of bacterial count detection after 40 seconds of rinsing with three gun water was higher than that after 5 seconds of rinsing, and the qualified rate of bacterial count detection after 8 mL and 10 mL of rinsing was higher than that after 2 mL of rinsing, with statistically significant difference (P<0.05). The qualified rate of bacteria count detection after 180 s of high-speed mobile phone water washing was higher than that after 30 s of washing, and the qualified rate of bacteria count detection after 10 mL of washing was higher than that after 2 mL of washing, with statistically significant difference (P<0.05). In the clinic, the qualified rate of bacteria count detection in 60 s and 50 s of high-speed mobile phone water washing with conventional water speed was higher than that in 5 s of washing, and the qualified rate of bacteria count detection in 60 s, 50 s and 40 s of maximum water speed was higher than that in 5 s of washing, with statistically significant difference (P<0.05). Conclusions The increase of water flow speed and flushing duration of DCU waterways helps to improve the qualification rate of bacteria detection in waterways and reduce the pollution of DCU waterways. |
