![]() ![]() 2, 19 Hydrogen peroxide represent traditional disinfectants of removable dentures. 18 Hydrogen peroxide is a well-known and used disinfectant and its effects are caused by its oxidative action, potentiated when the hydrogen peroxide is in the gas phase. 6 The antimicrobial action of sodium hypochlorite is fast, effective, and broad spectrum, according to the American Dental Association (ADA) protocol. When dissolved in water, it forms hypochlorous acid, which, in turn, dissociates into hydrochloric acid and oxygen atoms, having a potent oxidizing effect. Sodium hypochlorite is a water-soluble disinfectant used in surface and water disinfection. Sodium hypochlorite and hydrogen peroxide are two low-cost effective disinfectants always present in dental office. 16, 18 Besides its advantages, MD520 is not always available in dental settings. ![]() 16 It has shown good results in some studies regarding the evaluation of dimensional stability of dental impressions 17 and its antimicrobial efficacy. From a wide variety of disinfectant solutions on the market, MD520 commercial disinfectant is a combination of aldehydes, quaternary ammonium compounds, special surfactants and adjuvants in aqueous solution, having a bactericidal, tuberculocidal, and virucidal action (virus with and without envelope). 15 The disinfectant selection depends on the inanimate surface or object to be use. ![]() 12, 14 In this scenario, exploring a simple, accessible but efficient impression disinfection method is of major relevance.Ī disinfectant is a broad-spectrum chemical agent that may have bacteriostatic or bactericidal action and is used on an inanimate surface or object. 13 Some studies reveal that in real practice impressions' disinfection may vary significantly in different laboratories or even different countries. 10 However, there is still some reluctance in disinfecting dental impressions due to the possible degradation of the impression quality and the resulting cast. 12 Impressions disinfected by immersion should be time-limited and the Australian Dental Association recommends a maximum period of 15 minutes. 10, 11 Moreover, impressions disinfection through immersion, in opposition to spray, is considered the safest procedure, since all surfaces are equally covered by disinfectant. 1, 6 Currently, the Australian Dental Association and the Center for Disease Control (CDC) recommend disinfecting dental impressions immediately after their removal from the mouth. However, this method only partial eliminates the bacterial, viral, and fungal load, not avoiding the risk of potential infection. Up to 1991, washing of dental impressions under tap water was the recommended procedure for their disinfection. 4, 5, 6, 7 Dentists, dental assistants, and prosthetist laboratory technicians are all at risk of cross-infection. 1, 2, 3 Dental impressions are inevitably contaminated by contact with saliva, blood and bacterial plaque, which contains potentially pathogenic microorganisms such as Streptococcus, Staphylococcus, Escherichia coli, Mycobacterium tuberculosis, in addition to hepatitis B and C viruses, human immunodeficiency virus (HIV) and herpes simplex virus. Cross-infection is a relevant matter in dental medicine practice. ![]()
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