Grohmann Caio Vinícius Signorelli, Soares Eveline Freitas, Souza-Junior Eduardo José Carvalho, Brandt William Cunha, Puppin-Rontani Regina Maria, Geraldeli Saulo, Sinhoreti Mário Alexandre Coelho
Department of Restorative Dentistry, Dental Materials Division, Piracicaba Dental School, UNICAMP - Universidade Estadual de Campinas, Piracicaba, SP, Brazil.
Department of Prosthodontics, UNIVAG - Centro Universitário de Várzea Grande, Cuiaba, MT, Brazil.
Braz Dent J. 2017 Nov-Dec;28(6):726-730. doi: 10.1590/0103-6440201701372.
The aim in this study was to evaluate the influence of different ratio of camphorquinone/tertiary amine concentration on the flexural strength (FS), elastic modulus (EM), degree of conversion (DC), yellowing (YL), water sorption (WS) and water solubility (WSL) of experimental composites. Thus, acrylate blends were prepared with different camphorquinone (CQ) and amine (DABE) concentrations and ratios by weight: (CQ/DABE%): 0.4/0.4% (C1), 0.4/0.8% (C2), 0.6/0.6% (C3), 0.6/1.2% (C4), 0.8/0.8% (C5), 0.8/1.6% (C6), 1.0/1.0% (C7), 1.0/2.0% (C8), 1.5/1.5% (C9), 1.5/3.0% (C10). For the FS and EM, rectangular specimens (7x2x1 mm, n=10) were photo-activated by single-peak LED for 20 s and tested at Instron (0.5 mm/min). Then, the same specimens were evaluated by FTIR for DC measurement. For YL, disks (5x2 mm, n=10) were prepared, light-cured for 20 s and evaluated in spectrophotometer using the b aspect of the CIELab* system. For WS and WSL, the volume of the samples was calculated (mm³). For WS and WSL, composites disks (5x0.5 mm, n=5) were prepared. After desiccation, the specimens were stored in distilled water for 7 days and again desiccated, in order to measure the WS and WSL. Data were submitted to one-way ANOVA and Tukey's test (5%). The groups C8, C9 and C10 showed higher DC, EM and YL means, compared to other composites. Therefore, the FS and WS values were similar among all groups. Also, C1, C2 and C3 presented higher WSL in 7 days, compared to other composites. In general, higher concentrations of camphorquinone promoted higher physical-mechanical properties; however, inducing higher yellowing effect for the experimental composites.
本研究的目的是评估不同比例的樟脑醌/叔胺浓度对实验性复合材料的弯曲强度（FS）、弹性模量（EM）、转化率（DC）、变黄（YL）、吸水率（WS）和水溶性（WSL）的影响。因此，通过重量法制备了具有不同樟脑醌（CQ）和胺（DABE）浓度及比例的丙烯酸酯共混物：（CQ/DABE%）：0.4/0.4%（C1）、0.4/0.8%（C2）、0.6/0.6%（C3）、0.6/1.2%（C4）、0.8/0.8%（C5）、0.8/1.6%（C6）、1.0/1.0%（C7）、1.0/2.0%（C8）、1.5/1.5%（C9）、1.5/3.0%（C10）。对于FS和EM，矩形试样（7×2×1毫米，n = 10）通过单峰LED光激活20秒，并在英斯特朗试验机上以0.5毫米/分钟的速度进行测试。然后，使用傅里叶变换红外光谱仪（FTIR）对相同的试样进行DC测量评估。对于YL，制备圆盘试样（5×2毫米，n = 10），光固化20秒，并使用CIELab*系统的b值在分光光度计中进行评估。对于WS和WSL，计算样品的体积（立方毫米）。对于WS和WSL，制备复合材料圆盘（5×0.5毫米，n = 5）。干燥后，将试样在蒸馏水中储存7天，然后再次干燥，以测量WS和WSL。数据进行单因素方差分析和Tukey检验（5%）。与其他复合材料相比，C8、C9和C10组的DC、EM和YL平均值更高。因此，所有组的FS和WS值相似。此外，与其他复合材料相比，C1、C2和C3组在7天时的WSL更高。总体而言，较高浓度的樟脑醌可促进更高的物理机械性能；然而，会使实验性复合材料产生更高的变黄效应。
