Effect of accelerated aging on the color stability of cemented laminate veneers

Purpose: The effect of the aging process on color stability of light-cure, dual-cure, and self-cure resin cements used for luting laminate veneers was investigated in this study. Materials and Methods: Dyract Cem (self cure), Twinlook (dual cure), and En Force (light cure) cements, 0.30 mm thick, we re polymerized on laminate veneers that were 13 mm in diameter and 0.50 mm thick in an A2 shade. Five specimens were made for each material. The speci mens were subjected to an accelerated aging process in a Weather-Ometer for 900 hours. Spectrophotometric analyses were made after 300, 600, and 900 h ours of accelerated aging time. Overall color difference (Delta E*(ab)) was determined using the CIE-LAB system for measuring small color differences. Chroma changes (Delta C*(ab)) and hue differences (Delta H*(ab)) were also determined. Delta E*(ab), Delta C*(ab), and Delta H*(ab) were analyzed by one-way analysis of variance, t test for dependent samples, and Tukey hones tly significant difference (HSD) tests. Results: Delta E*(ab) values determ ined for the materials in this study varied in the acceptable range of 1.9 to 2.7. Different aging times caused no significant differences in Delta E* (ab), Delta C*(ab), or Delta H*(ab) values for any of the materials. There were no significant differences in the amount of overall color change among the 3 resin cements at the same aging period. Twinlook material showed the greatest chroma change at each aging time. The greatest hue change was det ermined for Dyract Cem material. Conclusion: The light-cure resin cement te sted can be proposed as a suitable material for luting laminate veneers, bu t long-term clinical studies are necessary to verify these experimental fin dings.