After the appropriate contact time the impression can be removed, rinsed thoroughly with tap water, shaken gently to remove adherent water, and poured.įor adequate inactivation of microbial contaminants, the contact time between impression and disinfectant should be at least equal to the time for tuberculocidal activity as recommended by the manufacturer of the germicide. Impressions can be sprayed thoroughly and placed in airtight plastic bags. When using impression materials that are predisposed to distortion from immersion, spraying may provide an acceptable alternative to immersion. Using stream spray can minimize aerosolization. Spraying does increase the chances for staff exposure to hazardous chemicals. Spraying uses less solution, and often the same disinfectant can be used for general disinfection of operatory surfaces. Impressions should be rinsed thoroughly under running tap water before disinfection to remove as much bioburden as possible.īoth immersion and spraying have been recommended for disinfection of impressions. ![]() In selecting an impression disinfectant, material compatibility is a requirement (see Table 1). It should be noted that no single disinfectant is compatible with all impression materials. Tuberculocidal hospital disinfectants with both hydrophilic and lipophilic virus kill are recommended. Personal protective equipment must be utilized and adequate ventilation in place when hazardous materials, such as disinfectants, are used. Optimally, impressions should be decontaminated through chairside disinfection immediately after removal from the patient`s mouth. ![]() Dental impressions are included in this category. Under OSHA`s 1991 Bloodborne Pathogens Standard, items contaminated with saliva in dental procedures are considered potentially infectious. Microorganisms can be transferred from contaminated impressions to dental casts, and oral bacteria can remain viable in set gypsum materials for up to seven days. Although most infectious agents do not survive for extended periods outside the body, many pathogens, if present in high enough numbers, can survive several days in protein-containing body fluids. Such fluids can contain viral and bacterial pathogens, including HIV and hepatitis A, B, and C viruses. Editor's note: Please read " Dental impression disinfection recommendations and best practices" on Dental Economics for updated (2022) information on the topic of infection control and dental impressions.ĭental impressions are among the items that are considered potentially infectious.ĭental impressions invariably are contaminated with patient saliva or blood.
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