Avaliação "in vitro" da influência do cimento adesivo Panavia EX na infiltração marginal de restaurações de amálgama de prata

Abstract

The purpose of this study was to evaluate, "in vitro" the effect of the adhesive resin cement lining (Panavia EX) in reducing microleakage of amalgam restorations with or without a enamel acid etching treatment. Thirty human teeth with class V cavity preparations were divided in three groups and restored as folows: group A - the teeth were restored with amalgam only; group B - one layer of Panavia EX was applied to the cavities before the restoration; and group C - the enamel of the cavity margins were acid etched, the cavity walls protected with Panavia EX and then restored. The teeth were then immersed in a solution of methylene blue. The analysis of the results indicated that: a) all the amalgam restorations without Panavia EX showed important microleakage (70% severe and 30% moderate); b) the restorations protected with Panavia EX showed reduced microleakage when compared with the control (group A); c) the acid etching did not influence the microleakage results.