Prieto Lúcia Trazzi, Pimenta de Araújo Cíntia Tereza, Araujo Pierote Josué Junior, Salles de Oliveira Dayane Carvalho Ramos, Coppini Erick Kamiya, Sartini Paulillo Luís Alexandre Maffei
Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas, Sao Paulo, Brazil.
Department of Dentistry, Faculty of Sciences of Health, Federal University of Jequitinhonha and Mucuri Valley, Diamantina, MG, Brazil.
J Conserv Dent. 2018 Jan-Feb;21(1):47-51. doi: 10.4103/JCD.JCD_128_17.
The aim of this study was to evaluate the color stability and degree of conversion (DC) of dual-cure and light-cure cements and flowable composites after thermal aging.
A total of 50 human incisors were prepared and divided into six groups ( = 10). Veneers were fabricated using IPS Empress Direct composite resin were bonded with three types of luting agents: Light-cured, conventional dual, and flowable composite according to the manufacturer's instructions. The groups were as follows: Filtek Z350XT Flow/Single Bond 2, RelyX ARC/Single Bond 2, RelyX Veneer/Single Bond 2, Tetric N-Flow/Tetric N-Bond, and Variolink II/Tetric N-Bond. Commission Internationale de l'Éclairage L*, a* and b* color coordinates were measured 24 h after cementation procedure with a color spectrophotometer and reevaluated after 10,000 thermal cycles. To evaluate the DC 50 specimens ( = 10) of each resin material were obtained and Fourier transform infrared spectroscopy was used to evaluate the absorption spectra. Statistical analysis was performed with one-way ANOVA and Tukey's test (α = 0.05).
No statistically significant differences in ΔE* occurred after aging. The greatest change in lightness occurred in the Variolink II resin cement. Changes in red-green hue were very small for the same cement and largest in the Tetric N-Flow flowable resin composite, while the greatest change in blue-yellow hue was a yellowing of the RelyX ARC luting cement. RelyX ARC exhibited the highest DC, and there were no statistically significant differences in DC among the other cements.
Resin-based luting agent might affect the final of ceramic veneer restorations. The thermal aging affected the final color of the evaluated materials, and these were regarded as clinically unacceptable (ΔE >3.3).
本研究旨在评估热老化后双固化和光固化粘结剂及可流动复合树脂的颜色稳定性和转化率（DC）。
制备50颗人切牙并分为六组（每组n = 10）。按照制造商的说明，使用IPS Empress Direct复合树脂制作贴面，并使用三种类型的粘结剂进行粘结：光固化、传统双固化和可流动复合树脂。分组如下：Filtek Z350XT Flow/Single Bond 2、RelyX ARC/Single Bond 2、RelyX Veneer/Single Bond 2、Tetric N-Flow/Tetric N-Bond以及Variolink II/Tetric N-Bond。使用色彩分光光度计在粘结操作24小时后测量国际照明委员会（CIE）L*、a和b颜色坐标，并在10000次热循环后重新评估。为评估DC，获取每种树脂材料的50个样本（每组n = 10），并使用傅里叶变换红外光谱法评估吸收光谱。采用单因素方差分析和Tukey检验进行统计分析（α = 0.05）。
老化后ΔE*无统计学显著差异。明度变化最大的是Variolink II树脂粘结剂。对于同一粘结剂，红绿色调变化非常小，在Tetric N-Flow可流动树脂复合材料中变化最大，而蓝黄色调变化最大的是RelyX ARC粘结剂的变黄。RelyX ARC表现出最高的DC，其他粘结剂之间的DC无统计学显著差异。
树脂基粘结剂可能会影响陶瓷贴面修复体的最终效果。热老化影响了所评估材料的最终颜色，并且这些变化在临床上被认为是不可接受的（ΔE > 3.3）。
