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Qom Univ Med Sci J 2020, 14(8): 30-38 Back to browse issues page
Evaluation of Bacterial Contamination Level of Waterlines in Dental Units in Dentistry School of Qom University of Medical Sciences in 2018
Samira Hajisadeghi1 , Mohammad Aghaali2 , Samaneh Aghighi Hatamipour3 , Mohammad Khalifeh-Gholi 4
1- Department of Oral and Maxillofacial Medicine, School of Dentistry, Qom University of Medical Sciences, Qom, Iran
2- Department of Epidemiology, School of health, Qom University of Medical Sciences, Qom, Iran
3- Department of Oral and Maxillofacial Medicine, School of Dentistry, Yazd University of Medical Sciences, Yazd, Iran
4- Department of Microbiology and Immunology, School of Medicine, Qom University of Medical Sciences, Qom, Iran , mkhgh2000@gmail.com
Abstract:   (321 Views)
Background and Objectives: According to hazardous infection possibility in patients with a weakened immune system, old adults, and children, microbial contamination in the waterlines of dental units has become a recent concern. The aim of the present study was to evaluate the microbial contamination in dental unit waterlines in the School of Dentistry, Qom University of Medical Sciences, Qom, Iran.
Methods: This descriptive-analytical study investigated 94 water samples collected from three parts of each unit, including air/water syringe, turbine headpiece, and cup filler, in the School of Dentistry in 2019. The water samples were taken on Saturday and Wednesday before and 60 sec after flushing on the same unit. The samples were transported in closed sterile containers to the Microbiology Laboratory. All the samples were incubated on nutrient agar plates using the Spread plate technique. Subsequently, bacterial contaminations were counted and reported based on CFU/ml for every plate. The data were analyzed using the Kruskal-Wallis test and Wilcoxon signed-rank test by SPSS software version 25.
Results: The total mean of the bacterial counts was reported as 16,457 CFU/ml. The pre-clinic and periodontics were reported with the highest and lowest bacterial counts, respectively. The mean of bacterial counts after flushing was significantly lower than that reported before flushing on the same unit (P<0.001). The mean bacterial contamination of different parts of the dental units was similar (P=0.145). There was no statistically significant difference between the mean bacterial counts of Saturday and Wednesday (P=0.074).
Conclusion: The obtained results of this study demonstrated that the biological contamination level of dental unit waterlines is high, and flushing can result in a partial decrease in this regard.
Keywords: Biofilms, Dentistry, Water microbiology.
Full-Text [PDF 931 kb]   (62 Downloads)    
Type of Study: Original Article | Subject: میکروب شناسی
Received: 2020/05/13 | Accepted: 2020/09/8 | Published: 2020/11/30
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Hajisadeghi S, Aghaali M, Aghighi Hatamipour S, Khalifeh-Gholi M. Evaluation of Bacterial Contamination Level of Waterlines in Dental Units in Dentistry School of Qom University of Medical Sciences in 2018. Qom Univ Med Sci J. 2020; 14 (8) :30-38
URL: http://journal.muq.ac.ir/article-1-2814-en.html

Volume 14, Issue 8 (October 2020) Back to browse issues page
مجله دانشگاه علوم پزشکی قم Qom University of Medical Sciences Journal
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