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A STUDY ON THE COLOR STABILITY OF RESIN CEMENTS LUTED FOR PORCELAIN LAMINATE VENEER  

Kim, Young-Woon (Department of Prosthodontics, College of Dentistry, Chonnam University)
Park, Ha-Ok (Department of Prosthodontics, College of Dentistry, Chonnam University)
Vang, Mong-Sook (Department of Prosthodontics, College of Dentistry, Chonnam University)
Yang, Hong-So (Department of Prosthodontics, College of Dentistry, Chonnam University)
Park, Sang-Won (Department of Prosthodontics, College of Dentistry, Chonnam University)
Publication Information
The Journal of Korean Academy of Prosthodontics / v.45, no.2, 2007 , pp. 191-202 More about this Journal
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, $({\Delta}E^*)$ 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$({\Delta}E^*)$ 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$({\Delta}E^*)$ 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$({\Delta}E^*)$ 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 3000 thermocycing, the color difference $({\Delta}E^*)$ of experimental resin cements was within clinically acceptable ranges. Color stability of 4 different resin cements was comparatively excellent.
Keywords
Color stability; Resin cement; Porcelain laminate veneer; Thermocycling;
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