Chen Wen Cheng, Wu Hui Yu
Chief, Advanced Medical Devices and Composites Laboratory; and Associate Professor, Department of Fiber and Composite Materials, College of Engineering, Feng Chia University, Taichung, Taiwan.
Research Assistant, Department of Fiber and Composite Materials, College of Engineering, Feng Chia University, Taichung, Taiwan.
J Prosthet Dent. 2014 May;111(5):416-24. doi: 10.1016/j.prosdent.2013.08.010. Epub 2013 Dec 19.
Some composite resins fail esthetically because the color differences to adjacent tooth structure are more than the limits of color tolerance (values are higher than 3.3 ΔE units).
The purpose of this study was to assess the effect on color stability of surface-modified dicalcium phosphate anhydrous particles treated with nanocrystallites and silane coupling agents used as fillers for dental composite resin.
Specimens were divided into 4 groups of fillers on unmodified (without modification) and on modified surfaces (silanization, nanocrystallites, and nanocrystallites with silica). These groups served as reinforcements and had 2 mass ratios of fillers (filler+resin) at 30% and 50%. The color differences were measured from day 1 after thermocycling procedures and for different specimen-treated procedures (drying, immersion, and thermocycling) at 1 to 16 days after 24 hours of immersion (n=5). ANOVA test was used to analyze the differences. The Student t test was used to evaluate the significant group comparisons, and a 3-way ANOVA was used to determine differences and interactions with the filler amount data (α=.05).
Specimens with lower amounts of silica-treated fillers exhibited more variations in color than specimens with larger amounts of fillers. The main color variation was observed within the dried specimens after 24 hours of immersion. The color difference stabilized within 8 days. Fewer changes in the ΔE values were noted in the groups of filler surfaces with nanocrystallites than in groups without nanocrystallized treatment after the 1 day to 16 days of aging.
Color difference was significantly reduced when the fillers reached a certain proportion, which further indicated that fillers with nanocrystal treatment could stabilize color variations within perceptible color tolerances (2.0 ΔE units) after immersion and thermocycling.
一些复合树脂在美学方面表现不佳，因为其与相邻牙齿结构的颜色差异超过了颜色公差限度（数值高于3.3 ΔE单位）。
本研究的目的是评估用纳米微晶和硅烷偶联剂处理的无水磷酸二钙颗粒作为牙科复合树脂填料时，对表面改性后的颜色稳定性的影响。
将样本分为4组，分别使用未改性（无修饰）和改性表面（硅烷化、纳米微晶以及含二氧化硅的纳米微晶）的填料。这些组用作增强材料，且填料（填料+树脂）有30%和50%两种质量比。在热循环程序后的第1天以及浸泡24小时后1至16天的不同样本处理程序（干燥、浸泡和热循环）下测量颜色差异（n=5）。采用方差分析检验来分析差异。使用学生t检验评估显著的组间比较，并采用三因素方差分析来确定与填料量数据的差异和相互作用（α=0.05）。
与填料量较多的样本相比，二氧化硅处理填料量较少的样本颜色变化更大。在浸泡24小时后的干燥样本中观察到主要的颜色变化。颜色差异在8天内趋于稳定。在老化1天至16天后，含纳米微晶的填料表面组的ΔE值变化比未进行纳米晶处理的组少。
当填料达到一定比例时，颜色差异显著降低，这进一步表明经过纳米晶处理的填料在浸泡和热循环后能够将颜色变化稳定在可感知的颜色公差范围内（2.0 ΔE单位）。
Zotero 插件