全新口腔综合治疗台水路污染情况监测

目的研究全新口腔综合治疗台(DCU)水路污染变化情况。方法采用随机抽样的方法,选择7台同一品牌的全新DCU,5台DCU为市政用水集中处理后统一供水,2台为独立储水罐供水。从临床使用第1天开始持续采集三用枪和高速手机水路和漱口水的水样,进行细菌培养,统计其菌落数量。结果共采集水样343份。开诊前冲洗水路2 min后三用枪和高速手机出水口水样的菌落数量的差异有统计学意义(P<0.01);集中供水和独立储水罐供水的口腔综合治疗台水路(DUWLs)菌落数量在冲洗前、后差异均无统计学意义(P>0.05);水路冲洗可以降低水路中菌落数量(P<0.01),但是全天的菌落数量无变化(P>0.05);全新DCU水路的菌落数量在投入临床使用第2天即可超过指南推荐的标准,且菌落数量与第1天相比出现增加,两组比较差异有统计学意义(P<0.05)。结论在临床工作中,无论采取何种供水方式,除按规定进行水路冲洗外,还应每天对DUWLs进行消毒。

Monitoring of pollution conditions of the new dental unit waterlines

Objective To study changes of pollution conditions of the new dental unit waterlines.Methods By means of random sampling,7 new dental chair units of the same brand were selected.Of which,5 dental chair units(DCU)were supplied with water after centralized treatment of municipal water and 2 dental chair units were supplied with independent water storage tanks.From the first day of clinical use,water samples of three-way syringes and high-speed dental handpieces and mouthwashes were continuously collected for bacterial culture and the number of colonies was counted.Results A total of 343 water samples were collected.There was a statistically significant difference in the number of colonies in the water samples from the outlet of three-way syringes and high-speed dental handpieces after the waterlines was rinsed for 2 min before treatment(P<0.01).There was no statistically significant difference in the number of dental unit warterlines(DUWLs)colonies between the central water supply and the independent water storage tank before and after washing(P>0.05).Waterline washing could significantly reduce the number of colonies in the waterlines(P<0.01),but there was no significant change in the number of colonies throughout the day(P>0.05).The number of colonies in the new DUWLs could exceed the recommended standard in the guideline on the second day of clinical use and the number of colonies increased significantly compared with that on the first day(P<0.05).Conclusions In clinical work,no matter what kind of water supply method is used,in addition to waterline washing according to regulations,DUWLs should be disinfected daily.