Shortall A C, Palin W M, Burtscher P
The University of Birmingham, School of Dentistry, St. Chad's Queensway, Birmingham B4 6NN, England.
J Dent Res. 2008 Jan;87(1):84-8. doi: 10.1177/154405910808700115.
Limited cure depth is a drawback of light-activated composites. We hypothesize that curing light transmission and cure depth are influenced by monomer reactivity and filler/resin refractive index mismatch. Light transmission throughout cure was recorded for composites based on strontium (refractive index 1.51) or barium (refractive index 1.53) glass fillers. Fillers were mixed (70 wt%) with 4 bisphenol-A diglycidyl-ether-dimethacrylate (bis-GMA):triethylene glycol dimethacrylate (TEGDMA) formulations with refractive indices ranging from 1.4703 to 1.5370. Following polymerization, cure depth and pre- and post-cure translucency parameters were determined. Transmission changes and cure depths related to monomer reactivity and filler/resin refractive index mismatch with significant interaction. Composites became more opaque or translucent on curing. Optimizing filler/resin refractive index mismatch provides increased curing depth and assists shade-matching.
固化深度有限是光固化复合材料的一个缺点。我们推测，固化光的透射率和固化深度受单体反应活性以及填料/树脂折射率失配的影响。记录了基于锶（折射率1.51）或钡（折射率1.53）玻璃填料的复合材料在整个固化过程中的光透射率。将填料（70重量%）与4种双酚A二缩水甘油醚二甲基丙烯酸酯（双-GMA）：三乙二醇二甲基丙烯酸酯（TEGDMA）配方混合，这些配方的折射率范围为1.4703至1.5370。聚合后，测定固化深度以及固化前和固化后的半透明参数。透射变化和固化深度与单体反应活性以及填料/树脂折射率失配存在显著相互作用。复合材料在固化时变得更不透明或更半透明。优化填料/树脂折射率失配可增加固化深度并有助于颜色匹配。
