de Oliveira Dayane Carvalho Ramos Salles, Rocha Mateus Garcia, Correa Ivo Carlos, Correr Américo Bortolazzo, Ferracane Jack L, Sinhoreti Mario Alexandre Coelho
Department of Biomaterials, School of Dentistry, Oregon Health & Science University, 2730 SW Moody Avenue, 27201 Portland, OR, USA; Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas, Av. Limeira, 900, 13414-903 Piracicaba, SP, Brazil.
Department of Biomaterials, School of Dentistry, Oregon Health & Science University, 2730 SW Moody Avenue, 27201 Portland, OR, USA; Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas, Av. Limeira, 900, 13414-903 Piracicaba, SP, Brazil.
Dent Mater. 2016 Oct;32(10):1209-1217. doi: 10.1016/j.dental.2016.06.010. Epub 2016 Jul 26.
To evaluate the effect of combining camphorquinone (CQ) and diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide (TPO) on the color and curing profile of resin-based composites.
Experimental composites were produced with different CQ and TPO molar concentrations: CQ-only, 3CQ:1TPO, 1CQ:1TPO, 1CQ:3TPO, and TPO-only. Polywave LED was characterized using a beam profiler. Block-shaped samples (5mm×5mm×3mm depth) were cured in a custom-designed mold with a polywave LED positioned to compare the regions exposed to the 420-495nm and 380-420nm LED emittances. To map the cure profile, degree of conversion (DC) of longitudinal cross-sections from each block were evaluated by FT-NIR. Color, light-transmittance and light-absorption during curing were evaluated on specimens 1-3mm thick. Data were analyzed using ANOVA/Tukey's test (α=0.05; β=0.2).
Though the polywave LED beam profile was non-uniform, up to a depth of 2mm no differences in DC were found among the composites containing CQ with TPO added up to 50%, regardless of the position under the curing tip. Composites with higher TPO concentration showed a decrease in DC beginning with a depth of 1mm, while composites with higher or similar CQ concentrations did not show decreased DC until a depth of 3mm. Higher TPO concentration reduced initial yellowness and color change after curing; and lower CQ concentration decreased light-absorption at greater depths.
The combination of CQ with TPO added up to 50% reduced the yellowness and color change of composites after curing without affecting cure efficiency up to a depth of 2mm.
评估樟脑醌（CQ）与二苯基（2,4,6-三甲基苯甲酰）氧化膦（TPO）联用对树脂基复合材料颜色及固化特性的影响。
制备含有不同CQ和TPO摩尔浓度的实验性复合材料：仅含CQ、3CQ:1TPO、1CQ:1TPO、1CQ:3TPO以及仅含TPO。使用光束分析仪对多波长发光二极管（Polywave LED）进行表征。将块状样品（5mm×5mm×3mm深）置于定制模具中，使用多波长发光二极管进行固化，该发光二极管的位置可用于比较暴露于420 - 495nm和380 - 420nm发光二极管发射光的区域。为绘制固化特性图，通过傅里叶变换近红外光谱（FT - NIR）评估每个块状样品纵向横截面的转化率（DC）。对厚度为1 - 3mm的试样评估固化过程中的颜色、透光率和吸光率。使用方差分析/图基检验（α = 0.05；β = 0.2）对数据进行分析。
尽管多波长发光二极管的光束轮廓不均匀，但在深度达2mm时，添加高达50% TPO的含CQ复合材料之间，无论在固化尖端下方的位置如何，转化率均无差异。TPO浓度较高的复合材料从1mm深度开始转化率降低，而CQ浓度较高或相似的复合材料直到3mm深度才出现转化率降低。较高的TPO浓度降低了初始黄度和固化后的颜色变化；较低的CQ浓度降低了较深深度处的吸光率。
CQ与高达50%的TPO联用可降低复合材料固化后的黄度和颜色变化，且在深度达2mm时不影响固化效率。
