Kandil Bassem S M, Hamdy Amena M, Aboelfadl Ahmed K, El-Anwar Mohamed I
Department of Prosthodontics, Ain Shams University, Cairo, Egypt.
Department of Oral Technology, Bonn University, Bonn, Germany.
Dent Res J (Isfahan). 2019 May-Jun;16(3):193-199.
The aim of this study was to evaluate the effect of ceramic material types, degree of veneer translucency, and luting cement shades on masking the underlying dark dental substrate to achieve best esthetics.
In this study, 56 specimens each of 0.5-mm thickness were fabricated from two esthetic veneer materials Vita Enamic and Vita Suprinity, with two different translucencies, i.e., HT and T. To simulate the color of a dark underlying dental structure, background discs with C3 shade were fabricated using resin composite. The ceramic specimens with varying translucencies were cemented on the dark background of the resin composite with A1 and opaque white shades of resin luting cement. Color difference (ΔE) values from a reference color (A1 shade) were calculated using a spectrophotometer. The results were then statistically analyzed using three-way ANOVA test (α = 0.05).
The ΔE values of both ceramic systems were affected by both the degree of veneer translucency ( = 0.00) and the luting agent shade ( = 0.016). The use of an opaque luting agent and T translucency resulted in a decrease in the ΔE* values for all ceramics tested, regardless to the material type. Suprinity and Enamic showed similarity in the masking ability of dark substrate after cementation.
None of the 0.5-mm veneers of the two ceramic systems could reach A1 shade without a detectable color difference after cementation. The change in degree of veneer translucency was more effective than the change in luting agent shade in masking the underlying dark substrate.
本研究的目的是评估陶瓷材料类型、贴面半透明度和粘结水门汀颜色对掩盖深色牙体底层结构以实现最佳美学效果的影响。
在本研究中，用两种美学贴面材料维他瓷聚合体（Vita Enamic）和维他超瓷（Vita Suprinity）制作了56个厚度为0.5毫米的样本，每种材料有两种不同的半透明度，即高透明度（HT）和低透明度（T）。为模拟深色牙体底层结构的颜色，使用树脂复合材料制作了具有C3色的背景圆盘。将具有不同半透明度的陶瓷样本用A1色和不透明白色的树脂粘结水门汀粘结在树脂复合材料的深色背景上。使用分光光度计计算与参考颜色（A1色）的色差（ΔE）值。然后使用三因素方差分析检验（α = 0.05）对结果进行统计学分析。
两种陶瓷系统的ΔE值均受贴面半透明度（P = 0.00）和粘结剂颜色（P = 0.016）的影响。无论材料类型如何，使用不透明粘结剂和低透明度半透明效果均导致所有测试陶瓷的ΔE*值降低。超瓷和瓷聚合体在粘结后对深色底层结构的遮盖能力上表现出相似性。
两种陶瓷系统的0.5毫米贴面在粘结后均无法达到A1色且无明显色差。在掩盖底层深色结构方面，贴面半透明度的变化比粘结剂颜色的变化更有效。
