Oivanen Maija, Keulemans Filip, Garoushi Sufyan, Vallittu Pekka K, Lassila Lippo
Department of Biomaterials Science and Turku Clinical Biomaterials Center -TCBC, Institute of Dentistry, University of Turku, Turku, Finland.
City of Turku Welfare Division, Oral Health Care, Turku, Finland.
Biomater Investig Dent. 2021 Apr 1;8(1):48-53. doi: 10.1080/26415275.2021.1906879.
When restorative resin composites absorb light from the surrounding tooth structures, it creates a color-match, which is known as 'a chameleon effect'. In this study, series of co-monomer mixtures were prepared with an increasing refraction index (RI) and mixed with glass fillers. The aim of this study was to optimize the mismatch of RI of resin/fillers to create the chameleon effect.
BisGMA/TEGDMA resins were prepared with seven different mix fractions from 20 to 80%. Two different series (A&B) of submicron (Ø 0.7 μm) silanized fillers (70 wt%) (A: Schott RI = 1.53, B: Esschem RI = 1.54) were mixed with resins (30 wt%). Disc-shaped specimens (1 mm thickness, Ø10 mm) for each composite combination ( = 3) were prepared and light cured for 20 s. Commercial resin composite (OmniChroma, Tokuyama Dental) was used as control. The translucency parameter (TP) was measured using a spectrophotometer. The color matching abilities of the experimental composites were visually analyzed. Data were statistically analyzed using ANOVA.
The composition of resin and type of fillers had a statistically significant effect on TP values ( < .05). The highest TP values were achieved around 50%-50% fractions of Bis-GMA and TEGDMA for series A and around 60%-40% fraction of Bis-GMA and TEGDMA for series B. Data showed that a high or low fraction of BisGMA resulted in a low translucent composite. Experimental resin composite (80% Bis-GMA) from series A was behaving similarly to Omnichroma in reference to TP values and color matching.
Including fillers with RI of 1.53 into BisGMA/TEGDMA resin with RI of 1.524 resulted in composite resin providing a good color match with surrounding structure 'chameleon effect'.
当修复性树脂复合材料吸收周围牙齿结构的光线时，会产生颜色匹配，这被称为“变色龙效应”。在本研究中，制备了一系列具有递增折射率（RI）的共聚单体混合物，并与玻璃填料混合。本研究的目的是优化树脂/填料的RI不匹配以产生变色龙效应。
制备了七种不同混合比例（20%至80%）的双酚A缩水甘油醚/三乙二醇二甲基丙烯酸酯（BisGMA/TEGDMA）树脂。将两种不同系列（A和B）的亚微米级（Ø 0.7μm）硅烷化填料（70 wt%）（A：肖特RI = 1.53，B：埃施姆RI = 1.54）与树脂（30 wt%）混合。为每种复合材料组合制备盘状试样（厚度1mm，Ø10mm）（n = 3），并光固化20秒。使用市售树脂复合材料（全彩，德山齿科）作为对照。使用分光光度计测量透光率参数（TP）。对实验复合材料的颜色匹配能力进行视觉分析。数据采用方差分析进行统计学分析。
树脂组成和填料类型对TP值有统计学显著影响（P <.05）。对于A系列，在双酚A缩水甘油醚（Bis-GMA）和三乙二醇二甲基丙烯酸酯（TEGDMA）约50%-50%的比例附近达到最高TP值，对于B系列，在Bis-GMA和TEGDMA约60%-40%的比例附近达到最高TP值。数据表明，BisGMA的高比例或低比例都会导致复合材料的透光率较低。A系列的实验树脂复合材料（80% Bis-GMA）在TP值和颜色匹配方面与全彩表现相似。
将RI为1.53的填料加入RI为1.524的BisGMA/TEGDMA树脂中，可使复合树脂与周围结构产生良好的颜色匹配，即“变色龙效应”。
