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首页> 外文期刊>Journal of biomedical materials research. Part B, Applied biomaterials. >Changes of Optical Properties of Dental Nano-Filled Resin Composites after Curing and Thermocycling
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Changes of Optical Properties of Dental Nano-Filled Resin Composites after Curing and Thermocycling

机译：固化和热循环后牙科纳米填充树脂复合材料光学性能的变化

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摘要

The objective was to evaluate the color changes after curing, polishing, and thermocycling of a nano-filled resin composite. A nano-filled composite was grouped into two shades of enamel (EN) and translucent (TL). One hybrid composite was used as a control (CL). Color of specimens of 10 mm in diameter and 2 mm in thickness was measured on a reflection spectrophotometer with SCE geometry under the D65 illumination over white and black backgrounds. Color before curing and after curing, polishing and thermocycling was measured. Color change (DELTA E*_(ab)), translucency parameter (TP), and contrast ratio (CK) were compared. Average DELTA E*_(ab) after curing was 4.6 in the EN group and 10.4 in the TL group compare to 2.9 in CL. Polishing caused average DELTA E*_(ab) of 3.3-3.6, which was not different by the shade group (p > 0.05). After 2000 cycles of thermocycling, average DELTA E*_(ab) was 1.4-1.8, which was not different by the shade group (p > 0.05). TP values increased after curing in the EN group, but decreased in the TL group (p < 0.05). TP values after thermocycling decreased in the EN group but did not change in TL (p = 0.05). TP values of TL shades were higher than those of EN regardless of specimen conditions (p < 0.05). Changes in CR values showed similar trends to those of TP values in translucency. Changes of color and translucency after curing, polishing, and thermocycling varied by the shade group.
机译：目的是评估纳米填充树脂复合材料在固化，抛光和热循环后的颜色变化。纳米填充的复合材料分为搪瓷（EN）和半透明（TL）两种阴影。一种混合复合材料用作对照（CL）。在具有SCE几何形状的反射分光光度计上，在D65照明下，在白色和黑色背景上，测量了直径为10毫米，厚度为2毫米的样品的颜色。测量固化之前和固化，抛光和热循环后的颜色。比较了颜色变化（ΔE * _（ab）），半透明参数（TP）和对比度（CK）。 EN组固化后的平均DELTA E * _（ab）为4.6，TL组为10.4，而CL组为2.9。抛光引起的平均DELTA E * _（ab）为3.3-3.6，在阴影组之间没有差异（p> 0.05）。经过2000个热循环后，平均DELTA E * _（ab）为1.4-1.8，在阴影组中没有差异（p> 0.05）。 EN组治愈后TP值升高，而TL组则降低（p <0.05）。 EN组热循环后的TP值降低，但TL不变（p = 0.05）。无论样品条件如何，TL阴影的TP值均高于EN的TP值（p <0.05）。在半透明状态下，CR值的变化显示出与TP值相似的趋势。固化，抛光和热循环后颜色和半透明性的变化因阴影组而异。

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