Soares Pablo Machado, Zucuni Camila Pauleski, Ilha Bruna Dias, Jacques Leticia Borges, May Liliana Gressler, Valandro Luiz Felipe
Post-graduate Program in Oral Science, Prosthodontic Unit, Faculty of Odontology, Federal University of Santa Maria(UFSM), Santa Maria, Rio Grande do Sul, Brazil.
Prosthodontics Unit, Faculty of Odontology, Federal University of Santa Maria, Santa Maria, Rio Grande do Sul State, Brazil.
Braz Dent J. 2024 Dec 16;35:e246094. doi: 10.1590/0103-6440202406094. eCollection 2024.
This study evaluated the effect of grinding and finishing treatments (polishing or glaze) on the color stability, translucency and opalescence of a translucent zirconia (3Y-TZP) after immersion in red wine. Discs (Ø= 12 mm; thickness 0.8 mm) of 3Y-TZP (Zenostar T, Ivoclar AG) were randomly allocated (n= 8) according to the surface treatment factor: Ctrl - as-sintered; Gr - grinding with diamond bur #4219; Gr + Pol - grinding followed by polishing; Gr + Gl - grinding followed by glaze. Surface roughness and scanning electron microscopy were carried out. All specimens were subjected to daily immersions in red wine for 30 minutes during 18 days. The color differences (ΔE00) were measured prior, after 9 and 18 days of immersion through the CIEDE2000 formula, as same as translucency (TP00) and opalescence (OP) parameters. Kruskal Wallis, repeated measures ANOVA/Tukey, and Spearman's correlation tests were performed to evaluate the roughness, optical and correlation data, respectively. The Gr + Gl depicted the lowest ΔE00 value after 9 days. The Gr group showed the greatest ΔE00 values in all immersion times, whereas the other groups presented similar behavior after 18 days. The Gr and Gr + Pol groups had the highest Ra and Rz values. The correlation between roughness and color change was moderate and significant (p= 0.02, r= 0.42). No differences were observed for TP00 and OP. The surface treatments affected the roughness and color stability of zirconia, being glaze application more effective to reduce color alterations after the immersion protocol.
本研究评估了研磨和表面处理（抛光或上釉）对一种半透明氧化锆（3Y-TZP）在浸入红酒后颜色稳定性、半透明度和乳光的影响。将3Y-TZP（义获嘉爱沃驰公司的Zenostar T）制成的圆盘（直径 = 12毫米；厚度0.8毫米）根据表面处理因素随机分组（n = 8）：Ctrl - 烧结态；Gr - 用4219号金刚石车针研磨；Gr + Pol - 研磨后抛光；Gr + Gl - 研磨后上釉。进行了表面粗糙度测量和扫描电子显微镜观察。所有试样在18天内每天浸入红酒中30分钟。通过CIEDE2000公式在浸入前、浸入9天和18天后测量颜色差异（ΔE00），半透明度（TP00）和乳光（OP）参数的测量方法相同。分别进行Kruskal Wallis检验、重复测量方差分析/Tukey检验和Spearman相关性检验来评估粗糙度、光学和相关性数据。Gr + Gl组在9天后呈现出最低的ΔE00值。Gr组在所有浸入时间内的ΔE00值最大，而其他组在18天后表现出相似的变化趋势。Gr组和Gr + Pol组的Ra和Rz值最高。粗糙度与颜色变化之间的相关性为中等且显著（p = 0.02，r = 0.42）。TP00和OP未观察到差异。表面处理影响了氧化锆的粗糙度和颜色稳定性，浸入实验后上釉在减少颜色变化方面更有效。
