DOI: 10.36347/sjds.2017.v04i04.009

Pages: 206-210

Infection control plays an important role in dental treatment and to overcome the problem of bacterial contamination that confronts dentistry, we should examine the dental treatment environment, in general, and dental units, in particular. The aim of this study is to evaluate bacterial contamination prior and subsequent to disinfection by the cleaning crew in the dental faculty of Qazvin University of Medical Science. Samples were collected from 24 randomly-selected units, each of which was divided up into seven different parts vulnerable to contamination. Sterile swabs soaked in saline were used for gathering samples from units and were placed into two types of tubes, one with saline content and the other with BHI content. The tubes were sealed and transported to a laboratory for incubation. The bacterial load was measured, and the type of bacterial content was identified. The data were analyzed using Tukey-Kramer method and t-tests on SPSS 21 software (α = 0.05). The results show that despite a significant reduction in the number of colonies after disinfection, no significant difference was found between pre- and post-disinfection in terms of infection rates and the type of organisms. Also before and after disinfection, Staphylococcus epidermidis was the most prevalent Species (51.9%) and Enterococcus was the least (3.7%). In addition, the process of disinfection adds new microorganisms in some cases.