A influência de sistemas adesivos e agentes cimentantes resinosos na resistência mecânica das lentes de contato dentais: uma revisão sistemática

Abstract

It was the advent of adhesive dentistry and the emergence of reinforced ceramics, the making of restorations in metal-free ceramics became possible. The glass- ceramics of lithium disilicate is very suitable for making restorations that require minimal or no dental wear or preparation - known dental contact lenses - because of its high flexural strength. These restorations must be able to support the mechanical forces to which any natural element is subjected, these especially arising from the processes of mastication, speech, among others. Thus, the objective of this work is to carry out a systematic review of the literature on the influence of dental luting agent types on the mechanical properties of glass laminate restorations. The database used to search for the articles was Pubmed and the inclusion criteria were: ceramic materials, glasss ceramics, laminates and microlaminates; mechanical assay studies In vitro; publication period: last five years (as of 2013); publications in the English language. The exclusion criteria were: ceramic repairs; zirconia; crowns; onlays and inlays. The conclusion reached was that the type of total ceramic used in dental contact lenses, that is, leuctic glass ceramics or lithium disilicate, is not a significant variable for the resistance of fractures of laminate restorations, since flaws are predominantly adhesive; conventional etch-and-rinse type resin cementing agents have higher fracture resistance values than the self-adhesive ones; and in turn, the dual polymerization cements tend to present better results than those of self polymerization or activated photo, when attached to the enamel; when dentin is the restoring attachment substrate, it is recommended to use chelating agents prior to the restorative adhesive cementation step to reduce the possibility of failure; the appropriate thickness of the cementing agent in the restoration of laminates is in dentin as in enamel, should be approximately 100 μm.