In vitro evaluation of microleakage in class V restorations in deciduous teeth using different composite resins

Abstract

This study evaluated the mar- ginal leakage in deciduous teeth restored with three different light- curing composite resins. Twenty- seven deciduous teeth were used, from the Human Tooth Bank at FOUSP, on which class V cavities were made. The samples were di- vided into 3 groups, of nine teeth each, according to the restorative material used: G1: Z-250; G2: Fil- tek Supreme and G3: A-110. The samples were submitted to ther- mal treatment (250 cycles), im- permeabilization and immersion in 1% blue methilene solution. They were sectioned in longitudi- nal mesio-distal direction, making a total of 54 samples for analysis. The evaluation was carried out by a calibrated examiner, with a 10x magnifying glass. The re- sults were evaluated through the Kruskal–Wallis test. The means of the positions were: G1 = 24,3; G2 = 43,4 and G3 = 25,1. The three groups presented microleakage in varied degrees, however G1 x G2 was statistically significant (p< 0,05) and G1 x G3 and G2 x G3 presented no differences. Key words: deciduous tooth, den- tal leakage, composite resins.