Relative translucency of six all-ceramic systems. Part II: Core and veneer materials
Relative translucency of six all-ceramic systems. Part II: Core and veneer materials
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DOI：
10.1067/mpr.2002.126795
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发表时间：
2002-07-01
影响因子：
4.6
通讯作者：
Vargas, MA
中科院分区：
文献类型：
--
作者：
Heffernan, MJ;Aquilino, SA;Vargas, MA
问题陈述。具有各种强化成分的全陶瓷核心材料具有一系列半透明。目前尚不清楚全瓷修复体材料与贴面核心材料的临床修复相似时，半透明程度是否有所不同。本研究比较了6种全瓷贴面和釉面全瓷材料在临床适宜厚度下的透光性。材料和方法。按照本研究第一部分的描述，制作了皇后牙本质、皇后2牙本质、In-Ceram Alumina、In-Ceram Spinell、In-Ceram Zirconia和Procera AllCeram的核心试件(每组n=5)，并与相应的牙本质瓷贴面，最终厚度为1.47±-0.01 mm。将这些标本与贴面Vitadur Alpha不透明牙本质(作为标准)、透明玻璃盘(阳性对照)和高贵金属烤瓷合金(PORC)进行比较。52SF)用Vitadur Omega牙本质贴面(阴性对照)。样品的反射率用连接到分光光度计的积分球在可见光光谱(380-700 nm)上测量；使用0度照明和漫反射观察几何图形。在上光循环后重复测量。对比度是根据具有黑色(Yb)和白色背衬(Yw)的样品的发光反射率(Y)来计算的，以获得具有CIE光源D65和2度观察函数(0.0=透明，1.0=不透明)的Yb/Yw。资料分析采用单因素方差分析及Tukey多重比较检验(P
Statement of problem. All-ceramic core materials with various strengthening compositions have a range of translucencies. It is unknown whether translucency differs when all-ceramic materials are fabricated similarly to the clinical restoration with a veneered core material.Purpose. This study compared the translucency of 6 all-ceramic materials veneered and glazed at clinically appropriate thicknesses.Material and methods. Core specimens (n = 5 per group) of Empress dentin, Empress 2 dentin, In-Ceram Alumina, In-Ceram Spinell, In-Ceram Zirconia, and Procera AllCeram were fabricated as described in Part I of this study and veneered with their corresponding dentin porcelain to a final thickness of 1.47 +/- 0.01 mm. These specimens were compared with veneered Vitadur Alpha opaque dentin (as a standard), a clear glass disc (positive control), and a high-noble metal-ceramic alloy (Porc. 52 SF) veneered with Vitadur Omega dentin (negative control). Specimen reflectance was measured with an integrating sphere attached to a spectrophotometer across the visible spectrum (380 to 700 nm); 0-degree illumination and diffuse viewing geometry, were used. Measurements were repeated after a glazing cycle. Contrast ratios were calculated from the luminous reflectance (Y) of the specimens with a black (Yb) and a white backing (Yw) to give Yb/Yw with CIE illuminant D65 and a 2-degree observer function (0.0 = transparent, 1.0 = opaque). One-way analysis of variance and Tukey's multiple-comparison test were used to analyze the data (P