Tornavoi Denise Cremonezzi, Agnelli José Augusto Marcondes, Panzeri Heitor, Dos Reis Andréa Cândido
Department of Dental Materials and Prosthodontics, Faculty of Dentistry of Ribeirão Preto, São Carlos, Brazil.
Indian J Dent Res. 2013 Sep-Oct;24(5):605-9. doi: 10.4103/0970-9290.123390.
The aim of this study was to evaluate the influence of accelerated artificial aging (AAA) on the color change of composite resins used in dentistry.
Three composite resins were evaluated: Two microhybrids and one hybrid of higher viscosity, with different amounts and sizes of filler particles, shades C2 and B2. A total of 54 specimens were obtained (18 for each composite resin), made of a Teflon matrix (15 mm in diameter and 2 mm in height). The color measurements were obtained with a Spectrophotometer, (PCB 6807 BYK Gardner) before and after AAA. Data were submitted to the Kolmogorov-Smirnov test (α >0.05), ANOVA and Tukey test (α <0.05). After statistical analysis, the color difference among composite resins with the same shades was analyzed.
All composite resins showed unacceptable color changes after AAA (ΔE > 3). Considering the variable ∆E, it was observed that the color tone C2 was already statistically different for the microhybrid composite resin prior to AAA (P < 0.05) and in shade B2 for hybrid of higher viscosity and microhybrid with barium glass fluoride aluminum and silica dioxide (P < 0.01). After this process, a statistically significant difference was observed only for shade B2 between microhybrid composite resins (P < 0.01) and for hybrid of higher viscosity and microhybrid with barium glass fluoride aluminum and silica dioxide (P < 0.05). Regarding the color difference within a same composite resin group, before aging the composite resin hybrid of higher viscosity B2 showed the highest color variation rate and microhybrid with zirconium/silica C2 showed the lowest.
All composite resins presented unacceptable color changes after 382 h of aging and different composite resins with same hue, presented different colors before being subjected to the aging process (B2 and C2) and after (B2). It was also observed color difference within a group of the same composite resin and same hue.
本研究旨在评估加速人工老化（AAA）对牙科用复合树脂颜色变化的影响。
评估了三种复合树脂：两种微混合树脂和一种高粘度混合树脂，其填料颗粒的数量和尺寸不同，色号为C2和B2。共获得54个样本（每种复合树脂18个），由聚四氟乙烯基质制成（直径15毫米，高2毫米）。在AAA处理前后，使用分光光度计（PCB 6807 BYK Gardner）进行颜色测量。数据进行了柯尔莫哥洛夫-斯米尔诺夫检验（α>0.05）、方差分析和Tukey检验（α<0.05）。统计分析后，分析了相同色号复合树脂之间的颜色差异。
所有复合树脂在AAA处理后均显示出不可接受的颜色变化（ΔE>3）。考虑变量∆E，观察到微混合复合树脂在AAA处理前色号C2就已存在统计学差异（P<0.05），对于高粘度混合树脂以及含氟铝酸钡玻璃和二氧化硅的微混合树脂，色号B2存在统计学差异（P<0.01）。此过程后，仅在微混合复合树脂的色号B2之间观察到统计学显著差异（P<0.01），以及高粘度混合树脂与含氟铝酸钡玻璃和二氧化硅的微混合树脂之间存在统计学显著差异（P<0.05）。关于同一复合树脂组内的颜色差异，老化前高粘度混合树脂B2的颜色变化率最高，含锆/二氧化硅的微混合树脂C2的颜色变化率最低。
所有复合树脂在老化382小时后均出现不可接受的颜色变化，相同色调的不同复合树脂在老化处理前（B2和C2）和老化后（B2）呈现不同颜色。还观察到同一复合树脂和相同色调组内存在颜色差异。
