Department of Biomaterials Science, Osaka University Graduate School of Dentistry, 1-8 Yamadaoka, Suita, Osaka 565-0871, Japan.
Department of Prosthodontics, Faculty of Dentistry, Ankara University, 06500 Besevler, Ankara, Turkey.
Dent Mater. 2021 May;37(5):e269-e275. doi: 10.1016/j.dental.2021.01.023. Epub 2021 Feb 6.
The aim of this study was to evaluate the optical properties of supra-nano spherical fillers with different diameters and the color matching ability of resin composites (RC) incorporating these fillers.
Two types of SiO-ZrO nano fillers with different diameters (150nm and 260nm) were used. The size distribution of each filler was measured and filler morphology was observed. The colors and spectral reflection spectra were measured by a spectral reflectometer. Experimental RCs incorporating ϕ150-nm/ϕ260-nm filler (D150RC/D260RC) were prepared. For the base dentin part, disc specimens (Estelite Astelia: A1B, A2B, A3B, A3.5B, or A4B) were prepared with a cylindrical cavity. Estelite Astelia with NE shade was layered on top as the enamel layer. Disk specimens with different cavity depths were prepared using A3B shade. Experimental RC was used to fill the cavity, and spectral reflection spectrums were obtained and analyzed. Filtek Supreme Ultra (FSU) with A3B shade was used (n=10) as a control.
Both ϕ150-nm and ϕ260-nm nano fillers showed uniform spherical shape and exhibited no aggregation. The maximum peaks of the spectral reflection spectra of the ϕ150-nm and ϕ260-nm nano fillers were 380nm and 580nm, producing structural colors close to blue and yellow, respectively. The spectral reflection spectrum of FSU had a broad peak at 540nm, and D150RC had a significant peak at 420nm. The D260RC specimen had a broad peak at 680nm. The peaks of D150RC and D260RC significantly decreased in accordance with the shift in base RC shade from A1B to A4B. There was no significant difference in the peak of the reflection spectral spectra among different cavity depths of D260RC. These results suggest that the experimental RC could reflect base RC colors via the matrix resin, and the amount of transmitted light from the base RC was not much different with cavity depth.
D260RC producing structural color demonstrated a broad spectrum and reduction in brightness and chromatic value by adapting to surrounding restorative materials, suggesting its ability to enhance the chameleon (blending) effects to improve color matching. D260RC showed better color matching ability than resin composite containing uniformly sized ϕ150-nm SiO-ZrO supra-nano spherical filler.
本研究旨在评估具有不同直径的超纳米球形填料的光学特性，以及掺入这些填料的树脂复合材料（RC）的配色能力。
使用两种不同直径（150nm 和 260nm）的 SiO-ZrO 纳米填料。测量每个填料的粒径分布并观察填料形貌。使用光谱反射仪测量颜色和光谱反射光谱。制备掺入 ϕ150nm/ϕ260nm 填料（D150RC/D260RC）的实验性 RC。对于基础牙本质部分，制备带有圆柱形腔的圆盘试件（Estelite Astelia：A1B、A2B、A3B、A3.5B 或 A4B）。将具有 NE 色调的 Estelite Astelia 分层作为牙釉质层。使用 A3B 色调制备具有不同腔深的圆盘试件。用实验性 RC 填充腔，并获得和分析光谱反射光谱。使用具有 A3B 色调的 Filtek Supreme Ultra（FSU）（n=10）作为对照。
ϕ150nm 和 ϕ260nm 纳米填料均呈均匀的球形，无聚集现象。ϕ150nm 和 ϕ260nm 纳米填料光谱反射光谱的最大峰值分别为 380nm 和 580nm，分别产生接近蓝色和黄色的结构色。FSU 的光谱反射光谱在 540nm 处有一个宽峰，D150RC 在 420nm 处有一个显著峰。D260RC 标本在 680nm 处有一个宽峰。随着基础 RC 色调从 A1B 变为 A4B，D150RC 和 D260RC 的峰值显著降低。D260RC 在不同腔深之间的光谱反射光谱峰值没有显著差异。这些结果表明，实验性 RC 可以通过基质树脂来反射基础 RC 颜色，并且从基础 RC 透射的光量与腔深差异不大。
产生结构色的 D260RC 通过适应周围修复材料显示出宽光谱和亮度及色度值降低的特点，表明其增强变色龙（混合）效果的能力，以改善配色。与含有均匀尺寸ϕ150nm SiO-ZrO 超纳米球形填料的树脂复合材料相比，D260RC 具有更好的配色能力。
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