Department of Biomaterials and Oral Biology, School of Dentistry, University of São Paulo, São Paulo, Brazil.
J Esthet Restor Dent. 2024 May;36(5):761-769. doi: 10.1111/jerd.13176. Epub 2023 Nov 27.
Demonstrate the ability of 0.5 mm thickness lithium disilicate laminates associated with resin cement to mask different substrate saturations.
60 specimens (n = 5) were prepared with CAD/CAM lithium disilicate glass-ceramic IPS e.max CAD, 0.5 mm thick, in three degrees of translucency (HT, MT and LT); cemented by Variolink Esthetic LC Light+ (L) and Neutral (N) on composite resin substrates A1 and A4 shades. Color measurements were performed by a spectrophotometer (CM-3700d -Konica Minolta). The L*, a*, b* parameters of the tri-layer structure (laminate/ resin cement/ substrate) were used to calculate color difference ( ) by CIEDE2000 formula and Translucency Parameter ( ). This study adopted = 0.8, as perceptibility threshold (PT), and = 1.8, as acceptability threshold (AT). Statistical analyses were performed by one-way ANOVA and Tukey tests (a = 0.05).
Color difference between resin cement shades showed statistical differences (p < 0.0001) and > 1.8 for all groups. Color difference between substrates saturations showed a significant statistical difference (p < 0.0001) and values above AT for all groups. The demonstrated significant statistical differences (p < 0.0001). The LTL combination, the opaquest set, showed the smallest values between substrate shades differences, however, above AT.
The translucency of the lithium disilicate, the substrate saturation and the resin cement opacity influenced final color of restoration. The ceramic translucency impact on final color was reduced by opaque resin cement. Furthermore, the LT lithium disilicate and the Light+ resin cement reduced the translucency of the restoration, contributing to mask saturated substrate.
This study shows the influence of conservative lithium disilicate laminates with different degrees of translucency associated with resin cement on final color of saturated substrate restorations. A minimally invasive esthetic protocol for masking substrates is demonstrated by associating low translucency ceramic laminates and opaque resin cement.
展示 0.5 毫米厚的二硅酸锂薄片与树脂水泥结合，以掩盖不同基底饱和度的能力。
用 CAD/CAM 二硅酸锂玻璃陶瓷 IPS e.max CAD 制备 60 个试件（n=5），厚度为 0.5 毫米，透明度为 3 个等级（HT、MT 和 LT）；用 Variolink Esthetic LC Light+（L）和 Neutral（N）分别将复合树脂基底 A1 和 A4 色调的树脂水泥粘接到玻璃陶瓷上。用分光光度计（CM-3700d - Konica Minolta）进行颜色测量。使用 CIEDE2000 公式和半透明度参数（ ）计算三层层结构（薄片/树脂水泥/基底）的 L*、a*、b*参数的色差（ ）。本研究采用 = 0.8 作为可感知阈值（PT）， = 1.8 作为可接受阈值（AT）。采用单因素方差分析和 Tukey 检验进行统计学分析（a = 0.05）。
树脂水泥色调之间的色差显示出统计学差异（p < 0.0001），所有组的 > 1.8。基底饱和度之间的色差显示出统计学上的显著差异（p < 0.0001），所有组的 值均高于 AT。 显示出显著的统计学差异（p < 0.0001）。最不透明的一组 LTL 组合，即最不透明的一组，在基底色调差异之间显示出最小的 值，但仍高于 AT。
二硅酸锂的半透明度、基底饱和度和树脂水泥不透明度影响修复体的最终颜色。不透明树脂水泥降低了陶瓷的半透明度对最终颜色的影响。此外，LT 二硅酸锂和 Light+树脂水泥降低了修复体的半透明度，有助于掩盖饱和基底。
本研究表明，不同半透明度的保守性二硅酸锂薄片与树脂水泥联合使用对饱和基底修复体的最终颜色有影响。通过联合使用低半透明度陶瓷薄片和不透明树脂水泥，展示了一种用于掩盖基底的微创美学方案。
