关键词: 树脂粘结剂, 颜色, 瓷贴面, 人工老化, resin cement, color, porcelain veneers, accelerated ageing

Abstract: Abstract: Objective To assess the color stability of different resin cements after accelerated ageing. Methods Four different resin cements were included in the study (1mm thickness). The resin cements were bonded to ceramic disks (0.5mm thickness) built with the VITABLOCS MARK-Ⅱ ceramic(n=10). All of the samples were stored in 37 ?C distilled water at dark. Then color measurement were determined using spectrophotometric before and after accelerated ageing in a weathering machine. Changes in color (ΔE) were obtained using the CIE Lab system coordinates where a ΔE data above 3 was accepted as visible discoloration. Results The ΔE of Superbond C?B, Variolink Ⅱ, RelyX Veneer and Filtek Z350 Flow were 2.32±0.21, 2.50±0.29, 0.68±0.24 and 0.79±0.20 respectively. The Superbond C?B and Variolink Ⅱachieved significant higher ΔE than the other groups (P<0.05). There was no significant difference between Superbond C?B and Variolink Ⅱ as well as RelyX Veneer and Filtek Z350 Flow (P>0.05). Conclusion All of the resin cements assessed in this study show varying degrees of discoloration after accelerated ageing. However, the color change are not beyond the clinical aesthetic demand. And the RelyX Veneer and Filtek Z350 Flow demonstrate a higher color stability.