معرفي فلور شكل زيستي و پراكنش جغرافيايي گياهان رويشگاه سرخدار افراتخته

Background and Aim: Bacterial contamination of dental unit waterlines may be attributed to biofilm formation. According to American Dental Association (ADA), bacterial colony counts of dental unit waterlines less than 200 CFU/ml if favorable. The aim of this study was to assess the effects of Bilpron, as a disinfectant, on bacterial colony counts of dental unit waterlines. Materials and Methods: In this controlled trial study on water samples of dental units, Shaheed Beheshti University of Medical Sciences, 6 units with Bilpron injection system as cases and 8 units without any disinfectant as controls of Endodontics department were investigated. Samples were obtained during 6 times, 3 samples of each unit (totally 108 samples in case group and 144 in control one). Sampling was performed on Wednesday and Saturday. Data were subjected to X^2 and Fisher exact tests. Results: In samples without any bacterial contamination on Wednesdays, Bilpron was able to prevent staphylococcus growth on Saturdays (3.3%) which was significantly lower than the controls (16.3%) (P<0.01). There was no infection of Pseudomonas, beta hemolytic streptococci and Ecoli in Bilpron group that for all types the differences were statistically significant (P<0.01). However in contaminated waterlines on Wednesday, there was not a statistically significant difference between two groups. Conclusion: Bilpron may prevent bacterial growth in water if it is not contaminated but its usefulness for contaminated water has not been proved.