Introduction: The dental chair system is a closed water supply network. The characteristics of each type of dental chair system, water stagnation in the network and other factors can form a biofilm on the inner surface of water pipes. This serves as a favorable condition for Legionella bacteria growth and colonization which represents a health risk to the water source users. Purpose: The purpose of this master's thesis is to set up a Legionella bacterium multiplication prevention plan for dentistry. Methods of work: The master's thesis was designed in several steps. After reviewing scientific articles and various national recommendations on Legionella reproduction prevention in dental unit’s waterlines we prepared a Legionella bacterium multiplication prevention plan for a major Slovenian health care institution. The plan was used in practice for two months and has been adapted and supplemented in accordance with gained experience. Results: The plan describes people responsible for carrying out activities, defines Legionella infection risk factors with the inclusion of endangered population characteristics, and outlines the water supply network with preventive measures for biofilm formation in dental unit’s waterlines. We also listed the corrective measures implemented in case of identified discrepancies. Discussion and conclusion: Legionella bacteria infection is an existing but often overlooked problem in dentistry due to lack of direct evidence. Nevertheless, experts note that dental professionals have a higher number of anti-Legionella blood antigens in comparison to the rest of the population. The most effective measure against infections are the preventive measures implementation, good hygienic practice at work and the provision of adequate quality of drinking water in the home water supply network. Our plan considered the dentistry work principle and manufacturer requirements with the greatest emphasis on protecting the health of employees and patients.
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