Department of Biomaterials Science, Graduate School of Medical and Dental Sciences, Kagoshima University, 8-35-1 Sakuragaoka, Kagoshima 890-8544, Japan.
Dent Mater J. 2010 Oct;29(5):575-81. doi: 10.4012/dmj.2010-045. Epub 2010 Aug 20.
Light-curing polyethyl methacrylate (PEMA)-urethane dimethacrylate (UDMA) resins and polymethyl methacrylate (PMMA)-UDMA resins were prepared by two processes. For first step, PEMA or PMMA powders were fully dissolved in ethyl methacrylate (EMA) or methyl methacrylate (MMA) and then the PEMA-EMA/PMMA-MMA mixtures were mixed with UDMA. The flexural properties of cured PEMA-UDMA and PMMA-UDMA polymers were measured using two PEMA (Mw: 300,000-400,000 and 650,000-1,000,000) and three PMMA (Mw: 30,000-60,000, 350,000 and 650,000-1,000,000) powders with different molecular weight, four mixing ratios of PMMA-MMA, and three mixing ratios of PMMA-MMA mixture and UDMA oligomer. Polymers with PMMA(Mw: 350,000) MMA=25/50, and with PMMA(Mw: 350,000)-MMA/UDMA=1/2 and =1/1, showed no-fracture in a flexural test at 1 mm/min and flexural strength and flexural modulus showed no significant difference compared with those of commercially available heat- and self-curing acrylic resins (p>0.01). Within limitation of this investigation, methyl methacrylate-UDMA blend polymer of this composition is available for denture base resin.
光固化聚甲基丙烯酸乙酯（PEMA）-尿烷二甲基丙烯酸酯（UDMA）树脂和聚甲基丙烯酸甲酯（PMMA）-UDMA 树脂通过两种工艺制备。第一步，将 PEMA 或 PMMA 粉末完全溶解在甲基丙烯酸乙酯（EMA）或甲基丙烯酸甲酯（MMA）中，然后将 PEMA-EMA/PMMA-MMA 混合物与 UDMA 混合。使用两种 PEMA（Mw：300,000-400,000 和 650,000-1,000,000）和三种 PMMA（Mw：30,000-60,000、350,000 和 650,000-1,000,000）粉末，不同分子量，四种 PMMA-MMA 混合比，和三种 PMMA-MMA 混合物与 UDMA 低聚物的混合比，测量了固化 PEMA-UDMA 和 PMMA-UDMA 聚合物的弯曲性能。当以 1mm/min 的速度进行弯曲试验时，具有 PMMA（Mw：350,000）MMA=25/50，以及具有 PMMA（Mw：350,000）-MMA/UDMA=1/2 和=1/1 的 PMMA 聚合物没有断裂，与市售热固性和自固性丙烯酸树脂相比，弯曲强度和弯曲模量没有显著差异（p＞0.01）。在本研究的限制范围内，这种组成的甲基丙烯酸甲酯-UDMA 共聚物可用于义齿基托树脂。
