Al-Senan Dana, Al-Nahedh Hend
Department of Clinical Dental Science, Princess Norah Bint Abdulrahman University, Faculty of Dentistry, Riyadh, Saudi Arabia.
Department of Restorative Dental Science, College of Dentistry, King Saud University, Saudi Arabia.
Saudi Dent J. 2022 Jul;34(5):362-368. doi: 10.1016/j.sdentj.2022.04.002. Epub 2022 Apr 12.
To evaluate the effect of light curing unit (LCU) types and distance from light curing unit tip on the translucency parameters (TP) of bulk fill composite materials.
Two bulk-fill resin composites and one nanohybrid composite were used in this study. The specimens were divided into groups based on the type of curing unit used, and further subdivided based on the distance of the curing source to the surface of the resin composite. Translucency was evaluated at 4 mm thickness (for the bulk-fill) and 2 mm thickness (for nanohybrid) after curing using two different light curing units at zero, 2 mm, and 4 mm distance. The results were analyzed using two-way ANOVA at the significance level of a p-value of < 0.05.
Among all the tested materials, Filtek Bulk Fill Posterior RBC showed the highest TP at 0 mm distance when cured with Blue phase G2 LED LCU and it was the least affected by the differences in distances. However, Filtek Z350 nanohybrid composite had no significant differences between the three distances when cured with Blue phase G2 LCU.
Translucency values among the studied bulk-fill materials are affected by material composition, curing units and the distance of the tip of the light source to the restoration surface.
评估光固化机（LCU）类型及光固化机尖端距离对大块充填复合材料透光参数（TP）的影响。
本研究使用了两种大块充填树脂复合材料和一种纳米混合复合材料。根据所使用的固化机类型将标本分组，并根据固化源到树脂复合材料表面的距离进一步细分。在使用两种不同的光固化机在距离为零、2毫米和4毫米处固化后，对4毫米厚度（大块充填材料）和2毫米厚度（纳米混合材料）的标本进行透光性评估。使用双向方差分析在p值<0.05的显著性水平下分析结果。
在所有测试材料中，当使用Blue phase G2 LED LCU固化时，Filtek Bulk Fill Posterior RBC在距离为0毫米时显示出最高的TP，并且受距离差异的影响最小。然而，当使用Blue phase G2 LCU固化时，Filtek Z350纳米混合复合材料在三个距离之间没有显著差异。
所研究的大块充填材料的透光值受材料组成、固化机以及光源尖端到修复体表面的距离影响。
