بررسي ميزان آلودگي باكتريايي آب يونيت هاي دانشكده دندانپزشكي شهيد بهشتي در سال 1378

The rate of bacterial contamination in dental units water supply at Shahid Behashti Dental School - 1999

Aim: This study was designed to assess the level of gram negative bacterial contamination in water supply of dental units used at Shahid Beheshti University at the year 1999. Material and Methods.- Water samples were obtained from water syringe lines and high - speed turbin lines of 30 dental units which were initially selected on random manner. All samples were stored in sterile tubes contaning 5" nutrient broth followed by an incubation stage on EMS and MacCankey plates for 48 hours at 37° C. Bacterial colonies were then counted and compared with suggested limit by ADA. Results: Sections of first floor had shown. Psedomonas and staphylococcus contamination were seen in 37.5% of the samples collected form dental units of surgical wards at first floor while 61.5% of the samples of dental units of restorative wards (2nd floor) had staphylococcus contam E.coli and Entrococcus contamination were found in samples of or the/paedo clinic water supply samples in 75% of the cases. Conclusion: there appeared to be a relationship between the increase in the number of microorganisms and water stagnation on the upper floors of the building.