Efeito do grau de translucidez na radiopacidade de resinas compostas

Abstract

The purpose of this study was to correlate the translucency degree of different resin composites on their radiopacity. Eight resin composites from three different manufacturers were selected, totalizing twenty-four materials. Resins used to restore dentin and enamel, and translucent and bulk-fill resins, in distinct colors, were selected from the following manufacturers: 3M ESPE (nanofilled), Ivoclar (nanohybrid) and FGM (microhybrid). Samples of each resin were prepared (n=5) using a silicon mold (5 mm diameter × 1,5 mm thickness); human samples of dentin and enamel were also prepared. The translucency degree of each resin was then measured using the translucent parameter (TP) method, and using a digital spectrophotometer (Vita Easyshade) and the CIEL * a * b * color system. Each sample was measured over white and black backgrounds, and data was noted for posterior TP calculation. Also, all the samples were x-rayed using a photostimulable phosphor plate system, for measurement of the materials radiopacity, in mmAl. All data were analyzed using One Way ANOVA and Tukey (α=5%); in addition, data for TP and radiopacity were correlated using Spearmen correlation test. Overall, the translucent and bulk-fill resin composites showed greater translucency than the other resins; while the body and enamel materials showed intermediate translucency to dentin and enamel, the dentin resins were more standardized, presenting similar translucency to human dentin. All tested resin composites showed similar or superior radiopacity to human enamel, except by the Empress Direct resin with Trans Opal color, which was not radiopaque. Dentin and enamel showed radiopacity similar to 1 and 2 mmAl, respectively. In conclusion, the resin composites investigated in this study demonstrated differences regarding their translucency degree and radiopacity, without any positive relationship between these two properties.