口腔综合治疗台水路污染相关影响因素

 目的 调查口腔综合治疗台水路（DUWLs）污染现状，探讨DUWLs污染的影响因素。方法 采用分层随机抽样的方法，抽取2017年6月22日—2018年2月23日北京某口腔医院门诊各科室不同品牌的口腔综合治疗台（DCU）进行水样采集、细菌培养及计数，采用单因素、多因素方差分析DCU品牌、使用年限以及诊疗科室、取样部位DUWLs水样菌落数的差异。结果 共采集DCU水样464份，DUWLs水样菌落中位数为2.6×10³（17~5.2×10⁵）CFU/mL。单因素方差分析结果显示，不同使用年限、不同诊疗专业以及不同品牌的DUWLs菌落数比较，差异均有统计学意义（均P<0.05），而DCU的不同出水端水样菌落数比较差异无统计学意义（P=0.067）。多因素方差分析结果显示，DCU使用年限、DCU品牌、诊疗专业均对DUWLs菌落数的变化有影响（P<0.001），且DCU品牌与诊疗专业、DCU品牌与使用年限之间存在交互作用（均P<0.001）。结论 目前DUWLs污染严重，并且受DCU使用年限、品牌以及诊疗专业等多种因素的共同影响。

Influencing factors for contamination of dental unit waterlines

Objective To investigate the contamination status of dental unit waterlines (DUWLs), and explore influencing factors for DUWLs contamination. Methods The stratified random sampling method was used to collect water specimens from different brands of dental chair unit (DCU) in various outpatient departments of a stomatologi-cal hospital in Beijing from June 22, 2017 to February 23, 2018, bacterial culture and counting was performed, univariate and multivariate analysis of variance was adopted to analyze the differences in bacterial colony of water specimens from DUWLs of different brands, service years, used clinics and sampling sites. Results A total of 464 DCU water specimens were collected, the median of colony forming unit of DUWLs water specimens was 2.6×10³(17-5.2×10⁵)CFU/mL. Univariate analysis of variance showed that there were significant differences in colony forming unit of water specimens from DUWLs of different service years, different diagnosis and treatment specialties and different brands (all P<0.05), but there was no significant difference in colony forming unit of water specimens at different outlet of DCU (P=0.067). Multivariate analysis of variance showed that service years and brands of DCU, as well as diagnosis and treatment specialties all influenced the change of DUWLs bacterial colony (P<0.001), and there was an interaction between DCU brands and diagnosis and treatment specialties, DCU brands and service years (both P<0.001). Conclusion At present, DUWLs are seriously contaminated and are jointly affected by various factors such as DCU service years, brands, as well as diagnosis and treatment specialties.