Uso repetido e abertura prolongada de frascos de sistemas adesivos: efeitos na evaporação do solvente e resistência adesiva.

Abstract

Dental adhesives are materials of great value for the Dentistry clinical practice. The solvent is an extremely important element in its constitution, so it's necessary to respect its characteristics when designing and executing the operational protocols. However, it is customary for professionals to keep the adhesive bottle open between applications, which favors solvent evaporation. Therefore, the aim of this study is to review, through the scientific literature, the effects of repeated use and prolonged opening of adhesive bottles on solvent evaporation and bond strength; which have great clinical and scientific relevance, once it allows to understand the bonding process under different situations. A bibliographic search was carried out on the websites and databases PubMed, Portal da BVS, MEDLINE, LILACS, BIREME and SciELO, having as inclusion criteria in vitro studies, with commercial adhesives, published as papers, in Portuguese and English, within the last two decades (1999 to 2019). Repeated use and prolonged opening of the adhesive bottles can lead to solvent loss through evaporation and result in reduced adhesive resistance to the dental substrate. Organic solvent-based adhesives, especially acetone, are the most vulnerable to exposure due to their high volatile capacity. Storing the adhesives under refrigeration, using the substance immediately after its dispense and following the manufacturer's instructions are fundamental measures for preserving the integrity of the adhesive solution and obtaining good clinical results.