牙科水道使用频率对水道细菌污染程度的影响  

Effect of Frequent Use of Dental Unit Waterlines on Water Contamination

作　　者：金爱琼[1] 赵俊颖[1] 宁克勤[1] 张磊[1] 

机构地区：[1]深圳市第二人民医院物价医保科,广东深圳518035

出　　处：《中华医院感染学杂志》2010年第13期1885-1887,共3页Chinese Journal of Nosocomiology

摘　　要：目的调查牙科水道使用频率对水道细菌计数的影响。方法 6个执行二氧化氯化学处理的牙科水道单元为试验单元,另6个未经化学处理的牙科单元作为对照单元,观察期4周,每周从每个牙科水道单元的4个分支水道末端内采集水样本,并记录各分支水道的使用频率,水样本系列稀释后置于R2A琼脂培养板,于37℃孵育7 d后计数菌落。结果试验、对照单元水道末端平均菌落数基线值分别为(1244±512)(、1186±477)CFU/ml,两者差异无统计学意义;4周处理后,试验单元菌落均数为(352±117)CFU/ml,各类末端水道间差异无统计学意义;而对照单元中使用频率最高的三用枪水道菌落数为(626±310)CFU/ml,使用频率最低的超声清洁头菌落数为(1744±826)CFU/ml,两者差异有统计学意义(P<0.01)。结论牙科水道使用频率的增加不影响那些已执行化学处理的水道,但与未执行化学处理的牙科水道污染程度呈负相关。OBJECTIVE To investigate the effect of frequency of use of the dental waterlines on contamination.METHODS Six dental unit waterlines（DUWL）,as test units,were treated with a chlorine dioxide cleaner.Another six similar units were used as controls without chemical treatment.During a 4-week observation,water samples were taken from each end-waterline on each of test and control units per week,and the frequency of use of each line was also recorded.The bacterial colony formation of the water samples was counted on R2A agar plates after 7-day incubation at 37 ℃.RESULTS In test units,there was no differences of the colony formation counts among a variety of end-waterlines.But in control units,the colony formation counts was 526±310 CFU/ml for the air/water syringe waterlines（with the highest frequency of use）,much lower than 1744±826 CFU/ml for the ultrasonic lines（with the lowest frequency of use） at week 4.CONCLUSION Increased frequency of use of DUWL does not affect lines that are chemically treated,but negatively correlates with the contamination of untreated DUWL.

关 键 词：牙科水道 使用频率 二氧化氯 菌落计数 

分 类 号：R181.32[医药卫生—流行病学]