Associate Professor, Department of Prosthetic Dental Sciences, College of Dentistry, King Saud University, Riyadh, Saudi Arabia.
Postgraduate student, Department of Prosthetic Dental Sciences, King Saud University, College of Dentistry, Riyadh, Saudi Arabia.
J Prosthet Dent. 2022 Sep;128(3):497.e1-497.e9. doi: 10.1016/j.prosdent.2022.06.009. Epub 2022 Jul 19.
Information regarding the masking ability of computer-aided design and computer-aided manufacture (CAD-CAM) resin-matrix ceramic materials with different compositions is scarce.
The purpose of this in vitro study was to evaluate the effects of background color and thickness on the optical properties (color and translucency) of CAD-CAM resin-matrix ceramics.
Twelve rectangular specimens were fabricated at a different thickness (1, 1.5, and 2 mm) (n=12) from each of the resin-matrix ceramic materials: Shofu block (SB), Lava Ultimate (LU), CERASMART (CS), VITA ENAMIC (VE), Crystal Ultra (CU), and the VITABLOCS Mark II feldspathic ceramic (VB). The color of the specimens over amalgam, titanium, enamel, and dentin backgrounds was measured with a spectrophotometer, and the color differences (ΔE∗) were calculated by using the Commission Internationale de l'Eclairage (CIE) 76 formula. The difference in color of the specimen over the black and white backgrounds was used to calculate the translucency parameter (TP). ANOVA was used to statistically test whether material, background, and thicknesses influenced ΔE∗ and TP values. Post hoc comparisons were performed to determine the significant difference among the groups (α=.05).
The interaction with 2 between factors demonstrated that the material was a factor that significantly influenced ΔE∗ (P<.001). The highest mean ±standard deviation of ΔE∗ was recorded in the combination of VB material and 2-mm thickness (1.84 ±0.37), and the lowest with CS material with 1.5-mm thickness (0.47 ±0.24). The type of material and specimen thickness significantly influenced TP (P<.001). The highest and lowest mean ±standard deviation of TP were recorded for the 1-mm-thick CS (14.20 ±0.90) and 2-mm-thick SB (4.91 ±0.42) specimens, respectively.
CERASMART resin-matrix ceramic and VITABLOCS Mark II feldspathic ceramic exhibited high and low masking abilities over the investigated background substrates, respectively. However, irrespective of the thickness, all study materials exhibited acceptable masking abilities.
有关不同成分的计算机辅助设计和计算机辅助制造（CAD-CAM）树脂基质陶瓷材料的掩蔽能力的信息很少。
本体外研究的目的是评估背景颜色和厚度对 CAD-CAM 树脂基质陶瓷光学性能（颜色和半透明度）的影响。
从每种树脂基质陶瓷材料（Shofu block [SB]、Lava Ultimate [LU]、CERASMART [CS]、VITA ENAMIC [VE]、Crystal Ultra [CU]和 VITABLOCS Mark II 长石陶瓷 [VB]）分别制作 1、1.5 和 2 毫米不同厚度的 12 个矩形样本（n=12）。用分光光度计测量样本在银汞合金、钛、釉质和牙本质背景下的颜色，并用国际照明委员会（CIE）76 公式计算颜色差异（ΔE*）。用样本在黑白背景下的颜色差异来计算半透明度参数（TP）。采用方差分析（ANOVA）统计检验材料、背景和厚度是否影响ΔE*和 TP 值。采用事后比较法确定组间的显著性差异（α=.05）。
2 个因素之间的相互作用表明，材料是显著影响ΔE*的因素（P<.001）。VB 材料和 2 毫米厚度组合的平均标准偏差最大（1.84±0.37），CS 材料和 1.5 毫米厚度组合的平均标准偏差最小（0.47±0.24）。材料类型和样本厚度显著影响 TP（P<.001）。CS 材料 1 毫米厚样本的平均标准偏差最高（14.20±0.90），SB 材料 2 毫米厚样本的平均标准偏差最低（4.91±0.42）。
CERASMART 树脂基质陶瓷和 VITABLOCS Mark II 长石陶瓷在研究的背景衬底上分别表现出高和低的掩蔽能力。然而，无论厚度如何，所有研究材料都表现出可接受的掩蔽能力。
