微酸性电解水用于口腔综合治疗台水路消毒的效果观察

Disinfection effect of slightly acidic electrolyzed water on Dental unit water lines

目的：研究微酸性电解水对口腔综合治疗台水路的消毒效果。方法选择5台独立水源的口腔综合治疗台，每晚灌入现生成的微酸性电解水，于次日8：00和12：00，分别于牙科手机和三用枪出水口采集水样，进行细菌菌落计数。研究分4个阶段：微酸性电解水有效氯含量约40 mg/L持续消毒20 d，有效氯含量约20 mg/L 持续消毒10 d，停止消毒7 d，有效氯含量约10 mg/L 持续消毒15 d。结果使用三种不同浓度微酸性电解水对口腔综合治疗台水路进行消毒后，水样的平均合格率依次为99.25％、98.00％、98.33％。期间停止对水路进行消毒，经过7 d的时间，水质的合格率由最初的100％变为0。结论口腔综合治疗台水路中存在微生物污染，使用微酸性电解水对口腔综合治疗台水路的消毒效果明显，不同浓度微酸性电解水的消毒效果无显著差异，因此，综合考虑消毒效果、口腔治疗设备的安全性、患者的口腔舒适度等因素，临床可使用低浓度有效氯的微酸性电解水用于独立水源口腔综合治疗台水路的持续消毒处理。

Objective To explore the disinfection effect of slightly acidic electrolyzed water on dental unit water lines （DUWLs）.Methods First, a total of 5 dental chair units （DCUs） with self-contained water supply were selected and were placed with freshly slightly acidic electrolyzed water （ SAEW） every night. And then, we collected water samples from dental handpieces and water outlet of the gun for three purposes at 8 am and 12 am of the next day to count bacterial colony. This research included four stages involving that the content of effective chlorine of SAEW was about 40 mg/L with 20 days for continuous disinfection, the content of effective chlorine was about 20 mg/L with 10 days for continuous disinfection and 7 days for stopped disinfection, the content of effective chlorine was about 10 mg/L with 15 days for continuous disinfection. Results The average pass rates of water samples were 99.25%, 98.00%, 98.33% with SAEW of three different concentrations for the disinfection of DUWLs. The pass rate of water quality was changed from initial 100% to 0 without disinfection for water lines for 7 days. Conclusions There is microbial contamination in DUWLs. The disinfection effect is remarkable with SAEW for DUWLs, and there is no significant difference among DUWLs of different concentrations. Therefore, SAEW with low concentration of effective chlorine can be applied in clinic for continuous disinfection of DUWLs with self-contained water supply by taking all factors （ disinfection effect, safety of dental treatment instruments, degree of comfort of patients and so on） into account.