Faculty of Dentistry, Department of Prosthodontics, Usak University, Uşak, Turkey.
Faculty of Dentistry, Department of Restorative Dentistry, İzmir Democracy University, İzmir, Turkey.
J Esthet Restor Dent. 2021 Mar;33(2):380-386. doi: 10.1111/jerd.12611. Epub 2020 Jun 19.
To evaluate the translucency and effects of different cement colors on the final shade of lithium disilicate ceramics (LDS) and zirconia-reinforced lithium silicate ceramics (ZLS) over an A1 and A3 tooth-shaded background.
Eighty-eight rectangular-shaped specimens were sliced from LDS and ZLS blocks. The final thickness of the specimens was set at 0.8 ± 0.01 mm. Spectrophotometric measurements for the translucency were taken against black and white backgrounds. Composite resin tooth-shaded background disks were fabricated in two shades (A1 and A3), as were resin cement disks (opaque and translucent) (n = 11). Next, the ceramic specimens and tooth-shaded backgrounds were connected with glycerin, and baseline measurements were taken. These measurements were used as a reference. Then, the ceramic specimens, cement specimens, and tooth-shaded backgrounds were connected together with glycerin, and a second set of measurements was taken. The CIEDE2000 (ΔE ) color formula was used to calculate the translucency and color differences. A Mann-Whitney U test was also performed for the translucency, and a three-way ANOVA (analysis of variance) test was performed for the ΔE values (α = .05).
The LDS and ZLS groups had similar translucency (P = .055). The ΔE values of the specimens were significantly affected by the cement color and tooth-shaded backgrounds in the LDS and ZLS groups (P < .05). Using the opaque cement color resulted in statistically significant differences against the light and dark (A1 and A3) tooth-shaded backgrounds in both the LDS and ZLS groups (P = .022 and P = .006).
The material type did not affect the translucency or final color. However, the cement color did affect the final shade when thin ceramic restorations were used.
It should be noted that the cement color and tooth-shaded background used may change the final color of thin high translucency ceramic restorations that contain lithium disilicate and zirconia-reinforced lithium silicate.
评估不同水门汀颜色对 A1 和 A3 牙色背景下锂硅玻璃陶瓷（LDS）和氧化锆增强锂硅玻璃陶瓷（ZLS）最终颜色的影响。
从 LDS 和 ZLS 块体上切制 88 个矩形试件，试件最终厚度设定为 0.8±0.01mm。在黑白背景下对透光率进行分光光度测量。制作了两种色调（A1 和 A3）的复合树脂牙色背景盘和树脂水门汀盘（不透明和半透明）（n=11）。然后，将陶瓷试件和牙色背景用甘油连接，进行基线测量，作为参考。然后，将陶瓷试件、水门汀试件和牙色背景用甘油连接在一起，进行第二次测量。采用 CIEDE2000（ΔE）色差公式计算透光率和颜色差异。同时对透光率进行曼-惠特尼 U 检验，对 ΔE 值进行三因素方差分析（α=0.05）。
LDS 和 ZLS 组的透光率相似（P=0.055）。LDS 和 ZLS 组的试件 ΔE 值受水门汀颜色和牙色背景的显著影响（P<.05）。在 LDS 和 ZLS 组中，使用不透明水门汀颜色与亮（A1）和暗（A3）牙色背景相比，差异有统计学意义（P=0.022 和 P=0.006）。
材料类型不影响透光率或最终颜色，但当使用薄型陶瓷修复体时，水门汀颜色会影响最终色调。
需要注意的是，水门汀颜色和牙色背景的使用可能会改变含有锂硅玻璃和氧化锆增强锂硅玻璃的薄型高透光陶瓷修复体的最终颜色。
