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首页> 外文期刊>The Journal of Prosthetic Dentistry >Relative translucency of six all-ceramic systems. Part I: Core materials.
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Relative translucency of six all-ceramic systems. Part I: Core materials.

机译：六个全陶瓷系统的相对半透明。第一部分：核心材料。

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Statement of Problem. All-ceramic restorations have been advocated for superior esthetics. Various materials have been used to improve ceramic core strength, but it is unclear whether they affect the opacity of all-ceramic systems. Purpose. This study compared the translucency of 6 all-ceramic system core materials at clinically appropriate thicknesses. Material and Methods. Disc specimens 13 mm in diameter and 0.49 +/- 0.01 mm in thickness were fabricated from the following materials (n = 5 per group): IPS Empress dentin, IPS Empress 2 dentin, In-Ceram Alumina core, In-Ceram Spinell core, In-Ceram Zirconia core, and Procera AllCeram core. Empress and Empress 2 dentin specimens also were fabricated and tested at a thickness of 0.77 +/- 0.02 mm (the manufacturer's recommended core thickness is 0.8 mm). A high-noble metal-ceramic alloy (Porc. 52 SF) served as the control, and Vitadur Alpha opaque dentin was used as a standard. Sample reflectance (ratio of the intensity of reflected light to that of the incident light) 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. Contrast ratios were calculated from the luminous reflectance (Y) of the specimens with a black (Yb) and a white (Yw) backing 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<.05). Results. Contrast ratios in order of most translucent to most opaque were as follows: Vitadur Alpha 0.60 +/- 0.03, Empress (0.5 mm) 0.64 +/- 0.01, In-Ceram Spinell 0.67 +/- 0.02, Empress 2 (0.5 mm) 0.68 +/- 0.02, Empress (0.8 mm) 0.72 +/- 0.01, Procera 0.72 +/- 0.01, Empress 2 (0.8 mm) 0.74 +/- 0.01, In-Ceram Alumina 0.87 +/- 0.01, In-Ceram Zirconia 1.00 +/- 0.01, and 52 SF alloy 1.00 +/- 0.00. Conclusion. Within the limitations of this study, there was a range of ceramic core translucency at clinically relevant core thicknesses. In order of decreasing translucency, the ranges were Vitadur Alpha dentin (standard) > In-Ceram Spinell > Empress, Procera, Empress 2 > In-Ceram Alumina > In-Ceram Zirconia, 52 SF alloy.
机译：问题陈述。提倡全陶瓷修复体是一种高级美学。已经使用了各种材料来提高陶瓷芯的强度，但是尚不清楚它们是否影响全陶瓷系统的不透明度。目的。这项研究比较了6种全陶瓷系统核心材料在临床上合适的厚度下的半透明性。材料与方法。圆盘样品的直径为13毫米，厚度为0.49 +/- 0.01毫米，由以下材料制成（每组n = 5）：IPS Empress牙本质，IPS Empress 2牙本质，In-Ceram氧化铝芯，In-Ceram Spinell芯，陶瓷内氧化锆芯和Procera AllCeram芯。还制作了Empress和Empress 2牙本质样品，并进行了测试，厚度为0.77 +/- 0.02毫米（制造商建议的芯厚度为0.8毫米）。以高贵金属陶瓷合金（Porc。52 SF）为对照，以Vitadur Alpha不透明牙本质为标准。样品反射率（反射光强度与入射光强度之比）是通过连接在分光光度计上的可见光谱（380至700 nm）的积分球测量的。使用了0度照明和漫射观察几何体。由具有黑色（Yb）和白色（Yw）背衬的样品的光反射率（Y）计算对比度，得到具有CIE光源D65和2度观察者功能的Yb / Yw（0.0 =透明，1.0 =不透明）。使用单向方差分析和Tukey的多重比较检验来分析数据（P <.05）。结果。最高半透明到最不透明的对比度如下：Vitadur Alpha 0.60 +/- 0.03，Empress（0.5毫米）0.64 +/- 0.01，In-Ceram Spinell 0.67 +/- 0.02，Empress 2（0.5毫米）0.68 +/- 0.02，女皇（0.8毫米）0.72 +/- 0.01，Procera 0.72 +/- 0.01，女皇2（0.8毫米）0.74 +/- 0.01，陶瓷内氧化铝0.87 +/- 0.01，陶瓷内氧化锆1.00 +/- 0.01和52 SF合金1.00 +/- 0.00。结论。在本研究的范围内，在临床上相关的磁芯厚度下存在一系列陶瓷磁芯半透明性。为了降低透明度，范围为Vitadur Alpha牙本质（标准）>陶瓷内尖晶石> Empress，Procera，Empress 2>陶瓷内氧化铝>陶瓷内氧化锆，52 SF合金。

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