Sajnani Ankit Rajesh, Hegde Mithra Nidharsh
Department of Conservative Dentistry and Endodontics, A B Shetty Memorial Institute of Dental Sciences, Nitte University, Deralakatte, Karanataka, India.
J Conserv Dent. 2016 Sep-Oct;19(5):482-6. doi: 10.4103/0972-0707.190020.
To evaluate the elution of bisphenol A-glycidyl methacrylate (BisGMA) and triethylene glycol dimethacrylate (TEGDMA) from two bulk-fill composites at different polymerization times, for different storage periods when cured with quartz-tungsten-halogen (QTH) curing unit.
Tetric N-Ceram bulk fill and EverX Posterior were analyzed using high-performance liquid chromatography unit. Totally, 68 samples were prepared, two groups (n = 17) from both the composites, one for each tested polymerization time. Each sample was cured with a QTH curing unit, using soft-start curing technique and stored in 2 ml of ethanol for 24 h. Storage medium was renewed and then stored again for 1 week. Data acquired were statistically analyzed.
The elution of BisGMA was significantly higher from Tetric N-Ceram bulk fill and BisGMA and TEGDMA from EverX Posterior composite at the end of 24 h, irrespective of the curing time. In EverX Posterior, a higher amount of TEGDMA was eluted at the end of 24 h, while at the end of 1 week, significantly higher amount of BisGMA was released.
A significant amount of the release of BisGMA as well as TEGDMA was seen from both the composites when stored for different time intervals.
评估用石英-钨-卤素（QTH）固化灯在不同聚合时间下，两种大块充填复合树脂中双酚A-甲基丙烯酸缩水甘油酯（BisGMA）和二缩三乙二醇二甲基丙烯酸酯（TEGDMA）在不同储存期的溶出情况。
使用高效液相色谱仪分析Tetric N-Ceram大块充填树脂和EverX Posterior复合树脂。共制备68个样本，每种复合树脂各两组（每组n = 17），每组对应一个测试聚合时间。每个样本用QTH固化灯采用软启动固化技术进行固化，并在2 ml乙醇中储存24小时。更换储存介质后再储存1周。对获取的数据进行统计学分析。
无论固化时间如何，在24小时结束时，Tetric N-Ceram大块充填树脂中BisGMA的溶出量显著更高，而EverX Posterior复合树脂中BisGMA和TEGDMA的溶出量显著更高。在EverX Posterior复合树脂中，24小时结束时TEGDMA的溶出量更高，而在1周结束时，BisGMA的释放量显著更高。
两种复合树脂在不同时间间隔储存时，均可见大量BisGMA和TEGDMA的释放。
