Perchyonok Victoria Tamara, Souza John, Küll Marcela Fernanda, Suzuki Thaís Yumi Umeda, Maluly-Proni Ana Teresa, Santos Paulo Henrique Dos
VTPCHEM PTY LTD, Research and Innovations, Melbourne, Australia.
TAFE Queensland Brisbane, Brisbane, Australia.
Braz Oral Res. 2019;33:e024. doi: 10.1590/1807-3107bor-2019.vol33.0024. Epub 2019 Apr 4.
The aim of this study is to evaluate the effect of chitosan or nanodiamond incorporation on the color stability and surface roughness of a bisacrylic resin subjected to artificial aging. Four bisacrylic resins were evaluated, namely, control, chitosan-modified material, nanodiamond-modified material, and chitosan-nanodiamond-modified material. Twenty-four specimens were prepared for each material. The surface roughness was determined using a profilometer with a cut-off of 0.25 mm. The baseline color was measured according to the CIE Lab* system using a reflectance spectrophotometer. After these tests, the specimens were individually immersed in cola soft drink, red wine, or distilled water (n = 8) for 28 days. After the aging, the surface roughness and final color were re-evaluated. The color stability was determined using the difference between the coordinates obtained before and after the aging process. The data on roughness and color change were evaluated using ANOVA and the Tukey test (α = 0.05). The results show that the incorporation of nanodiamonds and chitosan into a bisacrylic resin provided a better color stability to the materials (p = 0.007). The storage in red wine resulted in a higher variation in the surface roughness values, especially when only the nanodiamond was incorporated to the material (p < 0.05). The incorporation of both chitosan and nanodiamonds are promising in providing an improvement in the properties of the bisacrylic resin when they are simultaneously incorporated in the product.
本研究的目的是评估壳聚糖或纳米金刚石的加入对经人工老化的双丙烯酸树脂颜色稳定性和表面粗糙度的影响。评估了四种双丙烯酸树脂，即对照材料、壳聚糖改性材料、纳米金刚石改性材料和壳聚糖-纳米金刚石改性材料。每种材料制备24个试样。使用截止值为0.25 mm的轮廓仪测定表面粗糙度。使用反射分光光度计根据CIE Lab*系统测量基线颜色。这些测试后，将试样分别浸入可乐软饮料、红酒或蒸馏水中（n = 8）28天。老化后，重新评估表面粗糙度和最终颜色。使用老化前后获得的坐标差值确定颜色稳定性。使用方差分析和Tukey检验（α = 0.05）评估粗糙度和颜色变化数据。结果表明，将纳米金刚石和壳聚糖加入双丙烯酸树脂中可使材料具有更好的颜色稳定性（p = 0.007）。储存在红酒中导致表面粗糙度值变化更大，尤其是当材料中仅加入纳米金刚石时（p < 0.05）。当壳聚糖和纳米金刚石同时加入产品中时，它们在改善双丙烯酸树脂性能方面具有前景。
