二氧化氯对牙科综合治疗椅水路系统生物膜的清除作用

目的：探究二氧化氯（Cl O2）对牙科综合治疗椅水路系统（DUWL）生物膜及菌群生长的影响。方法：选择2019年7月至2019年12月温州医科大学附属口腔医院30台牙科综合治疗椅，应用5 mg/L ClO2消毒液进行DUWL消毒，并以灭菌蒸馏水冲洗作为对照，观察各时间段DUWL管道管壁上残留细菌生物膜及菌落数变化。结果：ClO2消毒后各时间段DUWL平均菌落计数均显著低于对照组，差异有统计学意义（P<0.05）；消毒后在远端、中段和近端管道管壁上细菌生物膜覆盖面积减少，可见被破坏的栅栏状结构和点状分布。结论：Cl O2可有效清除DUWL生物膜，抑制菌群的生长，具有优良的杀菌效果。

The removal effect of chlorine dioxide on the biofilm of the waterway system of dental comprehensive treatment chair

Objective: To explore the control effect of chlorine dioxide (ClO2) on the biofilm in the waterway system of the dental unit. Methods: Select 30 dental comprehensive treatment chairs in Hospital of Stomatology Wenzhou Medical University from July 2019 to December 2019, and apply 5 mg/L chlorine dioxide disinfectant to the dental unit waterline (DUWL) disinfection, and compare disinfection DUWL average colony count, bacterial biofilm coverage and distribution changes on the pipe wall in each time period after disinfection. Results: The average colony count of DUWL in each time period after disinfection with low concentration of ClO2 was significantly lower than before disinfection, showing statistical difference (P<0.05); after disinfection, the bacterial biofilm coverage area on the distal, middle and proximal pipe walls was decreased, and the damaged fence-like structure and dot-like distribution could be seen. Conclusion: ClO2 chlorine dioxide can effectively remove the biofilm in the waterway system of the dental comprehensive treatment chair, thus producing an excellent bactericidal effect by inhibition of flora growth.