ADHESIVE SYSTEMS: EVOLUTION AND PERSPECTIVES – LITERATURE REVIEW

Abstract

INTRODUCTION: The adhesive dentistry developed materials and techniques capable to preserve the dental tissues through the union of substrate with adhesive resinous systems. Modernly the resinous components are used in direct adhesive restorations, in orthodontic brackets´ luting, in indirect restorations´ luting, in canal root filling, in sealing areas of bad coalescence like pit and fissures, among others. OBJECTIVE: The aim of this study was to do a review about the evolution of adhesive systems and to discuss the main efforts of the present time in perfecting them in the sense of minimizing their inconveniences. METHODS: Selection of papers through electronic bases LILACS and PubMed/ MEDLINE using indexing terms like: dentin-bonding agents, adhesives and hydrolysis among the years of 1999 and 2016. RESULTS: The adhesive systems have been reason studies in the sense of preserving the existent interface between the composed resin and enamel and dentine. That union presents problems as: hydrolytic degradation, separation of phases among hydrophilic and hydrophobic components, homogeneity lack in the formation of hybrid layer, exhibition of collagenous fibrils no completely involved by the monomers to be polymerized, leaching monomers, differences in osmotic concentration gradient, difficulty of larger intimacy among organic and inorganic materials, interaction or removal of the smear layer and presence of quiescent bacterias in adhesive interface. The largest inconveniences are: nanoleakage, with bacterial invasion and secondary decays. CONCLUSIONS: To know the progresses in the dentin-bonding agents and how to use them correctly is fundamental for a favorable prognostic of the quality of adhesive aesthetic restorations.