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首页> 外文期刊>European Journal of Dentistry >Effects of delivering the same radiant exposures at 730, 1450, and 2920 mW/cm2 to two resin-based composites
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Effects of delivering the same radiant exposures at 730, 1450, and 2920 mW/cm2 to two resin-based composites

机译：在两种树脂基复合材料上以730、1450和2920 mW / cm2提供相同的辐射暴露的效果

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Objective: To evaluate the effects of curing two resin-based composites (RBC) with the same radiant exposures at 730, 1450, and 2920 mW/cm2. Materials and Methods: Two types of RBC, Filtek Supreme Ultra and Tetric-EvoCeram-Bulk Fill, were light-cured to deliver the same radiant exposures for 5, 10, or 20 s by means of a modified Valo light emitted diode light-curing unit with the light tip placed directly over each specimen. The RBC was expressed into metal rings that were 2.0 and 4.0 mm in thickness, directly on an attenuated total reflectance Fourier transform infrared plate heated to 33°C, and the degree of conversion (DC) of the RBC was recorded. The specimens were then removed and the Knoop microhardness (KHN) was tested at both the bottom and the top of each specimen. The KHN was tested again after 24 h and 7 days of storage in the dark at 37°C and 100% humidity. The DC and KHN results were analyzed with Fisher's protected least significant difference at α = 0.05. Results: The DC values for the specimens cured at the three different irradiance levels were similar. However, at different depths, there were differences in the DC values. In general, there were no clear differences among the samples cured in the three different groups, and the KHN was always greater 24 h and 7 days later (P Conclusions: Despite the curing time, and as long as the samples were cured with the same radiant exposures, there were no significant effects on the DC and KHN of both RBCs.
机译：目的：评估在730、1450和2920 mW / cm 2 下辐射相同的两种树脂基复合材料（RBC）的固化效果。材料和方法：通过改进的Valo发光二极管光固化，将两种类型的RBC（Filtek Supreme Ultra和Tetric-EvoCeram-Bulk Fill）进行光固化，以在5、10或20 s内提供相同的辐射暴露。将灯头直接放在每个样品上。直接在加热到33°C的衰减的全反射傅立叶变换红外板上，将RBC表示为厚度为2.0和4.0 mm的金属环，并记录RBC的转化度（DC）。然后取出样品，并在每个样品的底部和顶部测试努氏显微硬度（KHN）。在黑暗中于37°C和100％湿度下储存24小时和7天后，再次测试了KHN。 DC和KHN结果用Fisher的受保护最小显着差异（α= 0.05）进行分析。结果：在三种不同辐照度水平下固化的样品的DC值相似。但是，在不同的深度，DC值存在差异。通常，在三个不同组中固化的样品之间没有明显差异，并且KHN总是在24小时和7天后更大（P结论：尽管固化时间长，并且只要使用相同的样品进行固化）辐射暴露对两个RBC的DC和KHN均无显着影响。

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