MARIA BOLAT, SIMONA STOLERIU, VIORICA VASILACHE GIANINA IOVAN, GALINA PANCU, ANDREI VICTOR SANDU, IONUT TARABOANTA, SORIN ANDRIAN COMPARATIVE STUDY OF COLOR STABILITY OF THREE COMPOSITE MATERIALS, TREATED BY FINISHING AND COATED SEALING, AFTER IMMERSION IN DIFFERENT WHOLESALE The present study was conducted to evaluate the effects of common drinks consumed by patients (Coffee, Coca-Cola, Black Tea) on different types of composite restorations, finishing and surface sealing (nanocomposites, nanohybrids, ormocers) regarding color changes. 45 specimens of composite materials (Nanoceramic, Nanocomposite and Nanohybrid) were made and divided into 3 groups G1-control group, G2 - finished in 2 stages, and G3 glaze coated. The LOVIBOND RT 300 portable spectrophotometer was used to determine the color by following the CIELAB scale. The data was analyzed using Mann-Whitney followed by a multiple comparison t test. Significant differences were found between the groups in terms color changes (p<0.001). The results showed that for both groups of composites (G2 and G3), irrespective of the beverage they were immersed in, the DE values were significantly higher at 7 days compared with the 30 day values.
Keywords: composite; finishing; polishing; spectrophotometry; color changes