Resistência de união de restaurações submetidas a tratamento clareador

Abstract

Due to its aesthetic properties of composite resins has become the main material used in restorative procedures in the anterior teeth, resulting in clinical practice in many cases the presence of teeth restored with this material undergoing bleaching procedure and also many cases of composite restorations, which came into direct contact with the bleaching agents. The objective of this research was to conduct a systematic review of studies of literature that evaluated the effect of bleaching on existing adhesive restorations. Were conducted 54 searches in the databases PubMed, Web of Science and BVS with previously selected in MeSH descriptors, DeCS and articles on the subject, the descriptors were arranged in 18 search strategies. The inclusion of articles criteria: it must have been published in English, Portuguese or Spanish language; the last ten years (2004-2014); treat yourself to a survey in vitro; and conduct bond strength test (RU) on pre-existing composite resin restorations subjected to bleaching procedure. Two thousand two hundred and twelve articles were found and 5 articles accounted for all study requirements the final sample. The studies were conducted in Brazil (n= 4) and the United States (n= 1), among them 80% of the sample (n= 4) used bleaching agents with carbamide peroxide (PC) at 10% and undergone the test of tensile strength, 4 studies used the adhesive system Single Bond (SB) and 2 used the Filtek Z350 resin. The PC concentration to 10% did not alter the RU restorations in dentin and enamel substrates using the SB adhesive system; 20% PC concentrations decreased the RU of adhesive restorations in enamel; The longer the exposure time, even in different concentrations of bleaching agent, the greater the effect on RU adhesive restorations; In the same time interval as the concentration of the bleaching agent most effect on RU bonded restorations.