Int J Prosthodont. 2021 Jan-Feb;34(1):79-87. doi: 10.11607/ijp.7019.
To measure the effect of simulated aging on stained resin-ceramic CAD/CAM materials regarding the durability of color and gloss.
Test specimens (n = 15 per material) were prepared out of CAD/CAM ingots from two resin nanoceramics (Lava Ultimate [LVU], Cerasmart [CER]) and a polymer-infiltrated ceramic (ENA, VITA Enamic) stained with the manufacturer's recommended staining kit using photopolymerization. Control specimens were made of feldspathic ceramic (VITA Mark II [VM2]) and stained by means of ceramic firing. Negative control specimens (n = 15) (no staining) were prepared for each group. Color and gloss measurements were performed before and after each aging cycle by means of mechanical abrasion with a toothbrush. Groups were compared using Kruskal-Wallis test and paired post hoc Conover test. Changes within a group were calculated using Wilcoxon signed-rank test (α = .05).
The color difference (ΔE) was statistically significant for all stained CAD/CAM materials after simulated aging: CER (P < .001, 95% CI: 2.96 to 3.69), LVU (P = .004, 95% CI: 1.09 to 1.46), ENA (P = .004, 95% CI: 0.20 to 0.42), and VM2 (P < .001, 95% CI: 0.29 to 1.08). Aging resulted in a statistically significant increase in gloss in the LVU group (P < 0.001, 95% CI: 13.78 to 17.29), whereas in the ENA (P < .001, 95% CI: 7.83 to 12.72), CER (P < .001, 95% CI: 2.69 to 8.44), and VM2 (P = .014, 95% CI: 0.22 to 1.87) groups, a significant decrease in gloss was noted.
Color and gloss of stained resin-ceramic CAD/CAM materials changed significantly after aging by means of toothbrush abrasion in vitro.
测量模拟老化对染色树脂陶瓷 CAD/CAM 材料颜色和光泽耐久性的影响。
从两种树脂纳米陶瓷（Lava Ultimate [LVU]、Cerasmart [CER]）和一种聚合物渗透陶瓷（ENA、VITA Enamic）的 CAD/CAM 锭中制备测试样本（每种材料 15 个样本），使用光聚合对制造商推荐的染色试剂盒进行染色。对照样本由长石陶瓷（VITA Mark II [VM2]）制成，并通过陶瓷烧制进行染色。为每组制备了 15 个（无染色）的阴性对照样本。通过用牙刷进行机械磨损，在每个老化周期前后进行颜色和光泽度测量。使用 Kruskal-Wallis 检验和配对后 Conover 检验比较组。使用 Wilcoxon 符号秩检验（α=.05）计算组内的变化。
所有经过模拟老化的染色 CAD/CAM 材料的颜色差异（ΔE）均具有统计学意义：CER（P <.001，95%置信区间：2.96 至 3.69）、LVU（P =.004，95%置信区间：1.09 至 1.46）、ENA（P =.004，95%置信区间：0.20 至 0.42）和 VM2（P <.001，95%置信区间：0.29 至 1.08）。老化导致 LVU 组的光泽度有统计学意义的增加（P <.001，95%置信区间：13.78 至 17.29），而 ENA 组（P <.001，95%置信区间：7.83 至 12.72）、CER 组（P <.001，95%置信区间：2.69 至 8.44）和 VM2 组（P =.014，95%置信区间：0.22 至 1.87）的光泽度则显著降低。
通过体外牙刷磨损，染色树脂陶瓷 CAD/CAM 材料的颜色和光泽在老化后发生了显著变化。
