Cruvinel Diogo Rodrigues, Garcia Lucas da Fonseca Roberti, Consani Simonides, de Carvalho Panzeri Pires-de-Souza Fernanda
Post-graduate student, Ribeirao Preto School of Dentistry, University of São Paulo, Ribeirao Preto, SP, Brazil.
Eur J Dent. 2010 Jan;4(1):6-11.
This study assessed the color stability of two composites associated with two pulp protectors submitted to accelerated artificial aging (AAA).
60 test specimens were made with 0.5 mm of protection material (calcium hydroxide - CH or glass ionomer cement - GIC) and 2.5 mm of restoration material (Concept or QuixFil) and divided into 3 groups (n=10) according to the type of protection material/composite, and the control group (no protection). After polishing, color readings were obtained with a spectrophotometer (PCB 6807 Byk Gardner) before and after AAA for 384 hours, and L*, a*, and b* coordinates and total color variation (DeltaE) were analyzed (2-way ANOVA, Bonferroni, alpha=05).
Composites placed on CH presented lower L* levels than those on GIC, which presented higher L* values than the control group and lower b* values than those of the CH group. The Concept composite presented higher DeltaE levels for all groups, differing statistically from QuixFil, except when placed on GIC.
It was concluded that the protection material could affect the color stability and AAA is a factor that enhances this effect, depending on the type of composite used.
本研究评估了两种与两种牙髓保护剂相关的复合材料在加速人工老化（AAA）后的颜色稳定性。
制作60个测试样本，其中保护材料（氢氧化钙-CH或玻璃离子水门汀-GIC）厚度为0.5毫米，修复材料（Concept或QuixFil）厚度为2.5毫米，并根据保护材料/复合材料的类型分为3组（n = 10），以及对照组（无保护）。打磨后，在384小时的AAA前后用分光光度计（PCB 6807 Byk Gardner）进行颜色读数，并分析L*、a和b坐标以及总颜色变化（DeltaE）（双向方差分析，Bonferroni法，α = 0.05）。
置于CH上的复合材料L水平低于置于GIC上的复合材料，GIC的L值高于对照组，b*值低于CH组。Concept复合材料在所有组中的DeltaE水平较高，除置于GIC上外，与QuixFil在统计学上有差异。
得出的结论是，保护材料会影响颜色稳定性，并且根据所用复合材料的类型，AAA是增强这种影响的一个因素。
