Labban Nawaf, Al Amri Mohammad, Alhijji Saleh, Alnafaiy Sarah, Alfouzan Afnan, Iskandar Mounir, Feitosa Sabrina
Department of Prosthetic Dental Sciences, College of Dentistry, King Saud University, Riyadh, Saudi Arabia.
Indiana University School of Dentistry, Indianapolis, IN, USA.
J Adv Prosthodont. 2021 Feb;13(1):1-11. doi: 10.4047/jap.2021.13.1.1. Epub 2021 Feb 23.
The study compared the color change, lightness, and translucency of hybrid resin ceramics exposed to toothbrush abrasion and surface treatment.
Four hybrid ceramics [Lava Ultimate (LU), Vita Enamic (EN), Shofu HC (SH), and Crystal Ultra (CU)] were compared with a glass-ceramic (Vita Mark II) control. One hundred and twenty specimen blocks were prepared using a precision saw machine. Specimens in each material were divided into four subgroups based on the surface treatment (polishing or staining) and a storage medium (water or citric acid). Simulated tooth brushing with a mixture of 100 RDA (radioactive abrasives) with 0.3 ml distilled water was used for 3650 cycles (7300 strokes) for each specimen. Measurements for the color change, lightness, and translucency were measured after toothbrushing using a spectrophotometer. Statistical analysis compared outcomes using paired t-test, ANOVA, and Tukey post hoc test.
The maximum color change was identified in SH (stained acid) [1.44 (0.40)], whereas the lowest was identified in EN (polished water) [0.66 (0.16)] material. The maximum and minimum loss of surface translucency was observed in SH (polished water) [12.3 (0.52)] and EN (stained acid) [6.5 (0.55)] specimens, respectively. Lastly, loss of lightness was the highest in VM (polished acid) [69 (0.95)], whereas the lowest was observed in CU (stained water) [56.7 (0.86)].
The comparison presented a significant effect of toothbrush abrasion on translucency and lightness of the hybrid resin ceramics. Color change was not significantly influenced irrespective of the storage medium employed. Surface staining demonstrated the preservation and stability of color and optical properties under the influence of toothbrush abrasion and chemical trauma.
本研究比较了经受牙刷磨损和表面处理的混合树脂陶瓷的颜色变化、明度和半透明度。
将四种混合陶瓷[Lava Ultimate（LU）、Vita Enamic（EN）、松风HC（SH）和Crystal Ultra（CU）]与一种玻璃陶瓷（Vita Mark II）对照物进行比较。使用精密锯床制备了120个样本块。每种材料的样本根据表面处理（抛光或染色）和储存介质（水或柠檬酸）分为四个亚组。每个样本使用含100 RDA（放射性磨料）与0.3 ml蒸馏水的混合物进行模拟刷牙3650次循环（7300次 strokes）。刷牙后使用分光光度计测量颜色变化、明度和半透明度。统计分析使用配对t检验、方差分析和Tukey事后检验比较结果。
在SH（染色酸处理）材料中观察到最大颜色变化[1.44（0.40）]，而在EN（抛光水）材料中最低[0.66（0.16）]。表面半透明度的最大和最小损失分别在SH（抛光水）样本[12.3（0.52）]和EN（染色酸）样本[6.5（0.55）]中观察到。最后，明度损失在VM（抛光酸）中最高[69（0.95）]，而在CU（染色水）中最低[56.7（0.86）]。
该比较表明牙刷磨损对混合树脂陶瓷的半透明度和明度有显著影响。无论使用何种储存介质，颜色变化均未受到显著影响。表面染色表明在牙刷磨损和化学损伤的影响下颜色和光学性能的保持和稳定性。
