Bouzrati-Zerelli Mariem, Maier Maximilian, Dietlin Celine, Fabrice Morlet-Savary, Fouassier Jean Pierre, Klee Joachim E, Lalevée Jacques
Institut de Science des Matériaux de Mulhouse IS2M, UMR CNRS 7361, UHA, 15, Rue Jean Starcky, 68057 Mulhouse Cedex, France.
DENTSPLY DeTrey, De-Trey-Straße 1, Konstanz, Germany.
Dent Mater. 2016 Oct;32(10):1226-1234. doi: 10.1016/j.dental.2016.07.006. Epub 2016 Aug 24.
The aim of our study is to find an amine free photoinitiating system (PIS) for the polymerization of representative dental methacrylate resins. A photoinitiating system (PIS) based on camphorquinone (CQ)/triphenylgermanium hydride/diphenyl iodonium hexafluorophosphate is proposed and compared to the conventional CQ/amine couple. The polymerization monitoring of thin (∼20μm) and thick (1.4mm) samples of a bisphenol A-glycidyl methacrylate (Bis-GMA)/triethyleneglycol dimethacrylate (TEGDMA) blend (70%/30% w/w) and of a urethane dimethacrylate (UDMA) upon exposure to a commercial blue LED centered at 477nm under air or in laminate is described. Finally, the impact of the photoinitiating system composition on the final polymer color is evaluated in detail.
FTIR and DSC experiments are used to record the photopolymerization profiles. ESR spectrometry and steady state photolysis are used to detect the produced radicals. Color measurements are carried out to determine the key parameters in the bleaching of the different dental formulations.
The efficiency of the newly proposed PISs for the photopolymerization of BisGMA/TEGDMA and UDMA for thin (20μm) or for thick (1.4mm) samples upon exposure to a dental blue LED under air is excellent. It is noticeably higher than that of the CQ/amine reference couple. Excellent bleaching properties are also observed under irradiation in presence of the new PISs. A good correlation is found between the sample bleaching and the amount of Ph3GeH in the formulation. The excited state processes could be established. The overall chemical mechanisms for the initiation step were also clarified.
本研究的目的是寻找一种用于代表性牙科甲基丙烯酸酯树脂聚合的无胺光引发体系（PIS）。提出了一种基于樟脑醌（CQ）/三苯基锗氢化物/二苯基碘六氟磷酸盐的光引发体系（PIS），并与传统的CQ/胺体系进行比较。描述了双酚A-甲基丙烯酸缩水甘油酯（Bis-GMA）/三乙二醇二甲基丙烯酸酯（TEGDMA）共混物（70%/30% w/w）以及聚氨酯二甲基丙烯酸酯（UDMA）的薄（约20μm）和厚（1.4mm）样品在空气或层压条件下暴露于中心波长为477nm的商用蓝色发光二极管时的聚合监测情况。最后，详细评估了光引发体系组成对最终聚合物颜色的影响。
使用傅里叶变换红外光谱（FTIR）和差示扫描量热法（DSC）实验记录光聚合过程。采用电子自旋共振光谱（ESR）和稳态光解来检测产生的自由基。进行颜色测量以确定不同牙科配方漂白中的关键参数。
新提出的PISs用于BisGMA/TEGDMA和UDMA的薄（20μm）或厚（1.4mm）样品在空气中暴露于牙科蓝色发光二极管时的光聚合效率极佳。明显高于CQ/胺参考体系。在新PISs存在下照射时也观察到了优异的漂白性能。发现样品漂白与配方中Ph3GeH的量之间具有良好的相关性。可以确定激发态过程。还阐明了引发步骤的整体化学机理。
