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1.1 Background of the study
Antiseptics and disinfectants are used extensively in hospitals and other health care settings for a variety of topical and hard-surface applications. In particular, they are an essential part of infection control practices and aid in the prevention of nosocomial infections. Mounting concerns over the potential for microbial contamination and infection risks in the food and general consumer markets have also led to increased use of antiseptics and disinfectants by the general public. A wide variety of active chemical agents (or “biocides”) are found in these products, many of which have been used for hundreds of years for antisepsis, disinfection, and preservation. Despite this, less is known about the mode of action of these active agents than about antibiotics. In general, biocides have a broader spectrum of activity than antibiotics, and, while antibiotics tend to have specific intracellular targets, biocides may have multiple targets. The widespread use of antiseptic and disinfectant products has prompted some speculation on the development of microbial resistance, in particular crossresistance to antibiotics.
Chlorinated compounds are often used in dental clinics and laboratory environment due to their broad spectrum of antimicrobial activity, low toxicity, low cost and efficacy in biofilms.1 However, they corrode metals and are inactivated by organic matter at high concentrations. A slow-release chlorine compound, sodium dichloroisocyanurate is used in healthcare settings; however, it too is corrosive. Slow-release chlorine dioxide disinfectants have been developed containing corrosion inhibitors which are extensively used in the industrial settings.
The use of chlorine dioxide containing products in dentistry has been explored. Studies have shown that in mouthrinses it is effective for the management of chronic atrophic candidiasis, denture stomatitis, and the control of plaque accumulation, periodontal pathogens and oral malodor.2-5 The efficacy of sodium dichloroisocyanurate for disinfection of radiographic films and irreversible hydrocolloid impression material has also been established.6,7 none of the above studies have tested the efficacy of these disinfectants against Mycobacteria and Hepatitis B virus. In addition, anti hepatitis B virus activity of chlorine dioxide has not been established.
1.2 Statement of the problem
Chlorination of bacteria by active chlorine compounds with the aim of killing them occurs both in a variety of disinfection processes and, in vivo, in the myeloperoxidase-hypochlorite system that operates within phagolysosomes of human leuco-cytes.8–10 Investigations on the main long-lived oxidant produced by granulocytes and monocytes, N-chlorotaurine (NCT),11,12 revealed new insights in the consequences of the chlorination of pathogens. Incubation for a sublethal time of 1min in 1% NCT solution caused a lag of regrowth (postantibiotic effect) of bacteria and a loss of virulence of highly encapsulated staphylococci and streptococci, demonstrated in the mouse peritonitis model.13,14 In addition, bacteria chlorinated by the myeloperoxidase system lost their ability to induce nitric oxide and tumour necrosis factor-a in macrophages.
These findings prompted us to establish methods of detection and quantification of chlorination of bacterial surfaces and to perform the first systematic examination of chlorine covers on Gram-positive and -negative bacteria and Candida albicans.
1.3 Objectives of the study
The main objective of the study is to assess the antimicrobial properties of chlorine and alcohol disinfectants.
This study compares the antimicrobial effect of a chlorine dioxide and a chlorine generating disinfectant on the contaminants commonly present on dental instruments and in the dental surgery.
1.4 Significance/ Justifications of the study
This study will help to add to the existing knowledge in this area of research. It will be of significance in the health sector as it will reduce the effects and spread of bacteria on man. It will provide insightful information on individuals in order to educate them on the properties of chlorine and alcohol disinfectants.
This study will also help the educational sector, as it could be used as a source material to carryout further research related to this study.
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