Murat Sema, Batak Burcu, Yilmaz Deniz, Öztürk Caner
*Sema Murat, DDS, PhD, Department of Prosthodontics, Faculty of Dentistry, Ankara University, Ankara, Turkey.
Burcu Batak, DDS, PhD, Department of Prosthodontics, Faculty of Dentistry, Ankara University, Ankara, Turkey.
Oper Dent. 2023 Mar 1;48(2):176-185. doi: 10.2341/21-082-L.
This study aimed to investigate the effects of 16% carbamide peroxide (CP) on the relative translucency parameter (RTP) and color stability of thermally aged CAD-CAM glass-ceramics with glazing or polishing. Three different CAD-CAM blocks-feldspathic (VM), lithium disilicate (IPS), and zirconia-reinforced lithium silicate ceramic (VS)-were used in this study. The specimens were divided into two groups (n=10) according to surface treatments (glazing or polishing). Bleaching treatment with 16% CP was applied to the thermally aged specimens. A spectrophotometer (VITA Easyshade Advance) was used to measure the CIE Lab*coordinates of the specimens on white and black backgrounds, and RTP and color difference (ΔE00) values were calculated. The surface topography of the specimens and the atomic weight of the elements were analyzed with scanning electron microscopy and energy-dispersive x-ray. The data were analyzed by using the two-way ANOVA test for ΔE00 values and two-way repeated measures ANOVA test for RTP and color parameters values (a=0.05) and the Tukey post-hoc test was used for multiple comparisons of the groups. RTP values were statistically influenced by material type, bleaching, and finishing technique, and the interaction among these factors was found to be significant (p<0.05). ΔE00 values were statistically influenced by material type, finishing technique, and the interaction among these factors was also found to be significant (p<0.05). IPS presented significantly lower RTP and ΔE00 values for both glazed and polished surfaces (p<0.05). 16% CP bleaching agent caused changes in translucency of aged VM and IPS at different levels. Glazed surfaces presented higher color stability in comparison to mechanically polished surfaces for VS (p<0.05).
本研究旨在探讨16%过氧化脲（CP）对经过热老化处理且有上釉或抛光处理的计算机辅助设计与制造（CAD-CAM）玻璃陶瓷的相对半透明参数（RTP）和颜色稳定性的影响。本研究使用了三种不同的CAD-CAM块体——长石质（VM）、二硅酸锂（IPS）和氧化锆增强硅酸锂陶瓷（VS）。根据表面处理方式（上釉或抛光）将试样分为两组（n = 10）。对经过热老化处理的试样进行16% CP漂白处理。使用分光光度计（VITA Easyshade Advance）测量试样在白色和黑色背景下的CIE Lab*坐标，并计算RTP和色差（ΔE00）值。通过扫描电子显微镜和能量色散X射线分析试样的表面形貌和元素的原子量。使用双向方差分析测试ΔE00值，使用双向重复测量方差分析测试RTP和颜色参数值（α = 0.05），并使用Tukey事后检验对各组进行多重比较。RTP值在统计学上受材料类型、漂白和精加工技术的影响，并且发现这些因素之间的相互作用具有显著性（p<0.05）。ΔE00值在统计学上受材料类型、精加工技术的影响，并且发现这些因素之间的相互作用也具有显著性（p<0.05）。对于上釉和抛光表面，IPS的RTP和ΔE00值均显著较低（p<0.05）。16% CP漂白剂在不同程度上导致了老化VM和IPS的半透明性变化。对于VS，与机械抛光表面相比，上釉表面呈现出更高的颜色稳定性（p<0.05）。
