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Peracetic acid disinfection influence in the precision of implant supported denture models: the precision of the linear dimensional analysis

Grant number: 15/26902-6
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): March 01, 2016
Effective date (End): December 31, 2016
Field of knowledge:Health Sciences - Dentistry - Dental Materials
Principal researcher:Francisco de Assis Mollo Júnior
Grantee:Débora Monteiro de Lima
Home Institution: Faculdade de Odontologia (FOAr). Universidade Estadual Paulista (UNESP). Campus de Araraquara. Araraquara , SP, Brazil


A number of factors, ranging since patient expectation, until the requirements of technical relevance, determines the predictability of oral rehabilitation with implants. Thus for successful treatment seeks to precision fit between the abutments and crowns and between abutment and implant. However, obtaining accurate models is dependent on certain clinical and laboratory stages, indicating that the result should be traced by careful planning including determining items such as: tray used, the quality of the impression materials, template preparation master and working models, and technical transfer. Oral health professionals are constantly exposed to oral fluids such as blood and saliva, and consequently, a wide variety of potentially harmful microorganisms, which can survive minutes to weeks, extracorporeally, increasing the risk contraction infectious diseases such as syphilis, gonorrhea, tuberculosis, diphtheria, measles, mumps virus, rubella, influenza, herpes, chickenpox, cytomegalovirus infection, viral hepatitis and acquired immune deficiency syndrome. Biosecurity protocols are gaining greater prominence, whose importance goes beyond the individual protection. The need to avoid cross-contamination highlights an important clinical step to be followed, disinfecting impressions. However, all the characteristics of disinfectant solutions and disinfection techniques must be assessed to cause no change in the size of the impressions, which would cause incorrect transfer of the implant position and / or abutments and the consequent mismatch between the prosthesis and the implant. Peracetic acid is a substance used in medicine, especially in apparatus for hemodialysis and endoscope. It is internationally recognized as a highly effective disinfectant, with no reports of microbial resistance to this active principle. Nevertheless, it is still not possible to say that this disinfecting agent when used in impression material for production of implant-supported prostheses, does not affect the accuracy of the final model. Thus, the present study aims to assess the peracetic acid interferes with the stability made impression with polyvinyl siloxane and hence the accuracy of the models by analysis of the linear dimensional accuracy, and these possible changes analyzed by adaptation of the prosthetic components, and implants after obtaining the model.