Color stability of selected dual-cure composite resin cements.
PURPOSE: This in vitro study was conducted to determine the color stability of five dual-cure composite resin cements: Kerr Porcelite (Kerr Manufacturing Co, Romulus, NY), Jelenko PVS System (J.F. Jelenko and Co, Armonk, NY), Vivadent Heliolink (Vivadent USA, Amherst, NY), Mirage FLC (Chameleon Dental Products, Inc, Kansas City, KS), and Den-Mat Ultra Bond (Den-Mat Corp, Santa Maria, CA). MATERIALS AND METHODS: Each cement was used to lute two 10 mm circular Vita VMK porcelain disks 0.75 mm in thickness. The surfaces to be luted were sand blasted and a silane coupling agent applied. The natural glaze was unaltered. Manufacturer's directions were followed for manipulation of the cements. A jig was used during the application of the resins to control cement thickness. The samples were stored in distilled water at 37 degrees C. Using a Hunter Tristimulus Colorimeter (Hunter Associates Laboratory, Inc, Reston, VA), values were obtained for each specimen immediately, at 24 hours, and at 1, 2, 3, 4, 8, 12, 16, 20, and 24 weeks. RESULTS: An analysis of variance (ANOVA) showed significant differences for all specimens. Using the Scofield Hunter formula for identifying color differences (delta E), at 24 hours, and 24 weeks, Vivadent Heliolink showed the least color changes (24 hours delta E = 0.82, 24 weeks delta E = 0.98) and Kerr Porcelite the greatest (24 hours delta E = 3.94, 24 weeks delta E = 4.73). CONCLUSIONS: All dual-cure composite resin cements in this study showed short-term and long-term color change. Vivadent Heliolink showed the least color change, while Kerr Porcelite showed the most change.