Study of the action disinfectant peracetic acid accuracy of the type of plaster: an in vitro study

Abstract

For the success of treatments that require casts, one of the major steps to be considered is the molding. This step is essential for the successful construction of a prosthesis well suited, because the model will exhibit shapes and dimensions closest to the mouth of the patient for adaptation of the prosthesis to be satisfactory, thus ensuring the success of treatment. This step is influenced by several factors such as the technique used, the type of mold and material, the fluids in the oral cavity at the time of the molding and disinfection. Before being sent to the laboratory for prosthetic leak, the mold must undergo a thorough disinfection to avoid cross-infection occur. The microorganisms present in the mouth can survive for minutes to a few weeks extracorporeally. The literature shows that only the rinsing with water is not able to remove the bacterial load of the moldings thus remaining in measurable amount over the mold, can be transferred to the models. Thus adequate disinfection is important for pathogen transmission does not occur to mold the model. However the characteristics of disinfectant substances and disinfection techniques should be assessed so that no change in dimension of the mold, which would cause an incorrect transfer of facilities and thus failure of the treatment. Peracetic acid has a broad spectrum microbial action and some advantages such as no production of harmful byproducts and waste, increased sensitivity of bacterial spores to the heat besides acting oxidising free radicals present in the cell membrane of pathogens. Unlike most chemical disinfectants peracetic acid is not inactivated by the presence of organic matter. However, it is not yet possible to say that this disinfecting agent when used in molds for making prostheses, will not affect the accuracy of the final model. Thus, the present study aims to assess whether peracetic acid interferes with the stability of the mold and consequently the accuracy of plaster models. (AU)