A study on the color stability of resin cements luted for porcelain laminate veneer / 대한치과보철학회지

ABSTRACT

STATEMENT OF PROBLEMS Long-term success of esthetic restorations, depends on various factors, especially on color stability of the restorations. The color stability is affected by resin cements beneath the porcelain laminate veneers. PURPOSE: The purpose of this study was to comprehend the color stability of resin cements by comparing with 4 different kinds of resin cements (Choice, Variolink II, Nexus 2, Rely-X). MATERIAL AND METHODS: Porcelain laminate disk samples were luted with resin cements. After thermocycling of each 1000, 2000 and 3000 cycle, specimens were measured by spectrophotometers and the color differences were. RESULTS: 1. After thermocycling of 1000, 2000 and 3000cycle, color difference, (deltaE*) of all specimens were incresed, but were not statiscally significant differences. 2. In the Choice of A1 shade and the Nexus 2 of A3 shade, color difference(deltaE*) after thermocycling of 3000cycle was incre*ased significantly than after thermocycling of 1000cycle. However, other groups did not show any statistically significant differences (P<0.05). 3. After thermocycling of 3000cycle, color difference(deltaE*) between A1 shade and A3 shade of Nexus 2 showed statistically significant difference. However no statistically significant differences were observed in other groups (P<0.05). 4. The mean of color difference(deltaE*) is 1.0-2.06 after 3000 thermocycling and the data were ranked in the ascending order of Variolink II, Nexus 2, Choice and Rely-X in A1 shade group and Choice, Rely-X, Variolink II and Nexus 2 in A3 shade group. CONCLUSION: Above results revealed that, after 3000thermocycing, the color difference (deltaE*) of experimental resin cements was within clinically acceptable ranges. Color stability of 4 different resin cements was comparatively excellent.