Furuse Adilson Y, Gordon Kathryn, Rodrigues Flávia P, Silikas Nick, Watts David C
Biomaterials Science Research Group, School of Dentistry, The University of Manchester, Manchester, United Kingdom.
J Dent. 2008 Nov;36(11):945-52. doi: 10.1016/j.jdent.2008.08.001. Epub 2008 Sep 7.
To evaluate the colour-stability and gloss-retention of silorane versus dimethacrylate composites exposed to accelerated aging from daylight radiation.
Five disc-shaped specimens of photo-cured resin-composites were prepared and manually polished for each material (Filtek Silorane, Herculite XRV, Tetric Evoceram and QuiXfil). Colour and gloss were evaluated before and after periods (baseline, 24, 72, 120 and 192 h) of accelerated photo-aging in xenon light following ISO 7491:2000. Colour measurements were performed with a colourimeter according to the CIE-Lab colour-space. The colour change (DeltaE) for each time was calculated. The surface gloss was measured using a glossmeter. Results were evaluated using one-way ANOVA and Tukey tests (alpha=0.05). Correlations between logtime, DeltaE and gloss were evaluated using Pearson's correlation (alpha=0.05).
Materials generally decreased in L and a and increased in b. The strong exception was Filtek Silorane which maintained a and b. DeltaE was found to be a positive linear function of logtime for all materials. Materials varied in the magnitude and rate of increase of DeltaE with logtime: QuiXfil>Tetric EvoCeram>(Filtek Silorane>or=Herculite XRV). DeltaE remained<3.3 for Filtek Silorane and Herculite XRV. Gloss was found to be a negative linear function of logtime. Gloss was maximal in the sequence: Filtek Silorane approximately Tetric EvoCeram>Herculite XRV>QuiXfil.
Silorane gave the best overall performance in stability over time, compared to a set of representative dimethacrylate composites.
评估硅氧烷类复合材料与二甲基丙烯酸酯类复合材料在日光辐射加速老化后的颜色稳定性和光泽保持率。
为每种材料（Filtek Silorane、Herculite XRV、Tetric Evoceram和QuiXfil）制备五个圆盘形光固化树脂复合材料标本，并进行手工抛光。按照ISO 7491:2000标准，在氙灯下对标本进行加速光老化处理，处理时间段分别为基线、24、72、120和192小时，处理前后分别评估颜色和光泽。使用色差仪根据CIE-Lab颜色空间进行颜色测量，计算每次的颜色变化（ΔE）。使用光泽仪测量表面光泽。结果采用单因素方差分析和Tukey检验进行评估（α=0.05）。使用Pearson相关性分析评估log时间、ΔE和光泽之间的相关性（α=0.05）。
材料的L值和a值通常下降，b值上升。Filtek Silorane是个明显例外，其a值和b值保持不变。所有材料的ΔE是log时间的正线性函数。不同材料的ΔE随log时间增加的幅度和速率有所不同：QuiXfil>Tetric EvoCeram>（Filtek Silorane≥Herculite XRV）。Filtek Silorane和Herculite XRV的ΔE仍<3.3。光泽是log时间的负线性函数。光泽度从高到低依次为：Filtek Silorane≈Tetric EvoCeram>Herculite XRV>QuiXfil。
与一组代表性的二甲基丙烯酸酯类复合材料相比，硅氧烷类复合材料在长期稳定性方面总体表现最佳。
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