Volume 19 Issue 7
Jul.  2021
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Article Navigation >  Chinese Journal of General Practice  > 2021  >  19(7): 1228-1231
WANG Gui-qin, ZHANG Jie, LOU Jing, JIANG Man, XU Guo-chao. Investigation of bacterial contamination and disinfection level in oral dental chair waterway and application of flushing method in reducing bacterial contamination[J]. Chinese Journal of General Practice, 2021, 19(7): 1228-1231. doi: 10.16766/j.cnki.issn.1674-4152.002027
Citation: WANG Gui-qin, ZHANG Jie, LOU Jing, JIANG Man, XU Guo-chao. Investigation of bacterial contamination and disinfection level in oral dental chair waterway and application of flushing method in reducing bacterial contamination[J]. Chinese Journal of General Practice, 2021, 19(7): 1228-1231. doi: 10.16766/j.cnki.issn.1674-4152.002027
shu

Investigation of bacterial contamination and disinfection level in oral dental chair waterway and application of flushing method in reducing bacterial contamination

doi: 10.16766/j.cnki.issn.1674-4152.002027

  • Department of Stomatology, Zhejiang Hospital, Hangzhou, Zhejiang 310000, China

Funds:

 2017KY187

  • Received Date: 2020-05-08
    Available Online: 2022-02-16
    Abstract
  •   Objective  To investigate and analyse the current status of bacterial contamination in oral dental chair waterway, disinfection levels and the effectiveness of water flushing methods in reducing bacterial contamination.  Methods  A total of 112 dental chairs from 23 dental institutions in Hangzhou from April 2016 to January 2020 were selected as the subjects of this study. They were divided into three groups according to the scale of medical institutions: A (52 units), B (34 units) and C (26 units). The oral dental chair waterway was sampled for bacterial culture, and the current situation of bacterial contamination in the waterway was investigated. The flushing method was used to disinfect the dental chair waterway, and then a second waterway sampling test was performed to compare the changes in the number of bacteria in the waterway between the two samples.  Results  The overall over-standard rate of dental water for dental chairs was 39.13% (9/23), with group A having no water pollution, and the over-standard rate of group C was 60.00% (6/10), which was higher than that of group B (37.50%, 3/8), χ2=8.005, P=0.012. The overall rate of high-speed mobile phone water pollution was 56.25% (63/112). The rate of water pollution in group C was 92.31% (24/26), which was significantly higher than that in group B (73.53%, 25/34) and group A (26.92%, 14/52). The difference was statistically significant (χ2=14.927, 29.661, all P < 0.001). The overall rate of water pollution exceeding three-use guns was 68.75% (77/112), amongst which the rate of water pollution in group C (96.15%, 25/26) was significantly higher than that in group B (82.35%, 28/34) and group A (46.15%, 24/52, all P < 0.001). After the water washing method was implemented, the total number of oral dental chair waterway bacteria in the three groups was significantly reduced to within the standard range, and the total oral dental chair waterway bacteria in group A were significantly lower than those in groups B and C (all P < 0.05).  Conclusion  Bacterial contamination of dental waterways is a serious matter, and the smaller the size of the medical institution, the more serious the pollution of the dental chair waterway, which should be paid enough attention. Flushing can effectively clean the bacteria and microorganisms in the dental chair waterway, significantly reduce the degree of bacterial pollution in the waterway and improve the quality of the waterway, which is worthy of active application and promotion.

     

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