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首页> 外文期刊>The Journal of Prosthetic Dentistry >Effect of coping thickness and background type on the masking ability of a zirconia ceramic
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Effect of coping thickness and background type on the masking ability of a zirconia ceramic

机译：应对厚度和背景类型对氧化锆陶瓷掩蔽能力的影响

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Abstract Statement of problem The masking ability of zirconia ceramics as copings is unclear. Purpose The purpose of this in?vitro study was to evaluate the effect of coping thickness and background type on the masking ability of a zirconia ceramic and to determine zirconia coping thickness cut offs for masking the backgrounds investigated. Material and methods Thirty zirconia disks in 3 thickness groups of 0.4, 0.6, and 0.8 mm were placed on 9 backgrounds to measure CIELab color attributes using a spectrophotometer. The backgrounds included A1, A2, and A3.5 shade composite resin, A3 shade zirconia, nickel-chromium alloy, nonprecious gold-colored alloy, amalgam, black, and white. ΔE values were measured to determine color differences between the specimens on the A2 shade composite resin background and the same specimens on the other backgrounds. The color change (ΔE) values were compared with threshold values for acceptability (ΔE=5.5) and perceptibility (ΔE=2.6). Repeated measures ANOVA, the Bonferroni test, and 1-sample t tests were used to analyze data (α=.05). Results Mean ΔE values ranged between 1.44 and 7.88. The zirconia coping thickness, the background type, and their interaction affected the CIELab and ΔE values ( P Conclusions To achieve ideal masking, the minimum thickness of a zirconia coping should be 0.4 mm for A1 and A3.5 shade composite resin, A3 shade zirconia, and nonprecious gold-colored alloy, 0.6 mm for amalgam, and 0.8 mm for nickel-chromium alloy.
机译：摘要问题陈述氧化锆陶瓷作为应对的掩蔽能力尚不清楚。目的，其在体外研究中的目的是评估应对厚度和背景类型对氧化锆陶瓷的掩蔽能力的影响，并确定氧化锆的应对厚度切断，用于掩盖背景的背景。材料和方法30.4,0.6和0.8mm的3个厚度组的30个氧化锆盘被放置在9个背景中，使用分光光度计测量Cielab颜色属性。背景包括A1，A2和A3.5遮阳复合树脂，A3遮蔽氧化锆，镍 - 铬合金，非宏观金色合金，Amalgam，黑色和白色。测量ΔE值以确定A2遮阳复合树脂背景上的样本与其他背景上的标本之间的颜色差异。将颜色变化（ΔE）值与可接受性（ΔE= 5.5）和可感知性（ΔE= 2.6）进行比较。重复措施Anova，Bonferroni测试和1样本T测试用于分析数据（α= .05）。结果平均值在1.44和7.88之间。氧化锆应对厚度，背景类型及其相互作用影响了Cielab和Δe值（P结论以实现理想的掩蔽，氧化锆应对的最小厚度应为A1和A3.5遮阳复合树脂的0.4mm，A3遮蔽氧化锆，氨基汞合金为0.6mm，镍铬合金0.8mm的非鲜金合金。

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