Assistant Professor, Department of Prosthodontics, Faculty of Dentistry, Selçuk University, Konya, Turkey.
Professor, Department of Prosthodontics, Faculty of Dentistry, Ankara Yıldırım Beyazıt University, Ankara, Turkey.
J Prosthet Dent. 2021 Mar;125(3):528.e1-528.e8. doi: 10.1016/j.prosdent.2020.10.012. Epub 2020 Dec 3.
How the optical properties of zirconia restorations are affected by their differing processing techniques is unclear.
The purpose of this in vitro study was to evaluate the effects of 5 different fabrication techniques on the optical properties of zirconia-based systems, including the color difference between the corresponding shades (ΔE∗, ΔE), translucency parameter, opalescence parameter, and fluorescence (ΔE∗-FL).
Sixty zirconia disks (IPS e.max ZirCAD) were prepared (0.5 ±0.01mm thick) and veneered by using different techniques (n=15): Group L - layering with fluorapatite ceramic; Group P - pressing with fluorapatite ceramic; Group CB - veneered with pressing followed by layering technique; Group CO - digitally veneered with lithium disilicate glass-ceramic; and Group FZ - prepared from monolithic zirconia (inCoris TZI) (n=15). All the specimens were set to 1.5 ±0.02 mm in thickness. Color measurements were made with a spectrophotometer. Data were statistically analyzed with 1-way ANOVA and the Tukey honestly significant difference, Kruskal-Wallis, Bonferroni (α=.05), Pearson, and Spearman correlation tests (α=.01).
Significant differences were found among the groups for all the optical parameters (P<.05). All the groups showed color differences higher than the perceptibility and acceptability thresholds for ΔE∗ and ΔE, except the P and FZ groups that showed values lower than the acceptability threshold (ΔE∗<2.7). Translucency parameter, opalescence parameter, and ΔE∗-FL values ranged between 5.77 and 9.95, between 4.72 and 7.07, and between 1.93 and 3.14, respectively. Strong positive correlations were found between ΔE∗ and ΔE, as well as between translucency parameter and opalescence parameter (P<.001).
The optical properties of the zirconia-based systems were significantly affected by the fabrication techniques even when the same nominal shade was used. Therefore, the color reproduction, translucence, opalescence, and fluorescence of the selected materials should be considered for acceptable color matching.
尚不清楚氧化锆修复体的光学性能如何受到其不同加工技术的影响。
本体外研究的目的是评估 5 种不同制造技术对基于氧化锆系统的光学性能的影响，包括相应色调之间的色差（ΔE*，ΔE）、半透明度参数、乳光参数和荧光（ΔE*-FL）。
制备 60 个氧化锆圆盘（IPS e.max ZirCAD）（0.5±0.01mm 厚），并使用不同技术进行贴面（n=15）：组 L-用氟磷灰石陶瓷分层；组 P-用氟磷灰石陶瓷压制；组 CB-先用压制技术再用分层技术贴面；组 CO-用锂二硅玻璃陶瓷数字贴面；组 FZ-由整体氧化锆（inCoris TZI）制备（n=15）。所有标本的厚度均设定为 1.5±0.02mm。使用分光光度计进行颜色测量。使用单因素方差分析和 Tukey Honestly Significant Difference、Kruskal-Wallis、Bonferroni（α=.05）、Pearson 和 Spearman 相关检验（α=.01）对数据进行统计学分析。
所有光学参数在组间均存在显著差异（P<.05）。所有组的颜色差异均高于ΔE和ΔE 的可感知和可接受阈值，除 P 和 FZ 组的颜色差异低于可接受阈值（ΔE<2.7）外。半透明度参数、乳光参数和ΔE*-FL 值分别在 5.77 到 9.95、4.72 到 7.07 和 1.93 到 3.14 之间。ΔE*和ΔE 之间以及半透明度参数和乳光参数之间存在很强的正相关关系（P<.001）。
即使使用相同的标称色调，氧化锆基系统的光学性能也会受到制造技术的显著影响。因此，应考虑所选材料的颜色再现、半透明度、乳光和荧光，以实现可接受的颜色匹配。
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