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The Effect of Translucency and Background Variations on the Color Difference of CAD/CAM Lithium Disilicate Glass Ceramic.

机译：半透明和背景变化对CAD / CAM二硅酸锂玻璃陶瓷色差的影响。

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摘要

Statement of the problem: Replication of natural tooth color is one of the most difficult challenges in prosthetic dentistry, especially in single tooth restorations in the anterior region and when the adjacent tooth is discolored or non-vital.;Purpose of the study: The purpose of this study is to compare the effect of translucency and background variations on the color difference of different shades of CAD/CAM lithium disilicate glass ceramic.;Materials and methods: A sample size of n=10 was suggested according to a pilot study. Lithium disilicate glass ceramic cylinders (12 mm in diameter and 13 mm in length) in three different ceramic shades (BL1, A2 and C3) were fabricated by CAD/CAM technology. Specimen disks were cut into sections of 1.2 mm thickness and 12 mm diameter. Four different combinations of translucency and background color were considered among the different shades: group 1 (HT ND1), group 2 (HT ND4), group 3 (LT ND1), and group 4 (LT ND4). Each specimen was placed against different backgrounds (ND1, ND4). A spectrophotometer was used to measure the color difference (DeltaE) and DeltaLab. Non-parametric tests (Kruskal-Wallis tests) were used to evaluate the color differences among the tested groups, and follow-up tests (Mann-Whitney U tests) were used with Bonferroni correction. Furthermore, for each ceramic shade, high translucency groups were compared to low translucency groups to determine the influence of translucency on color differences using a non-parametric test (Mann-Whitney U test).;Results: All tested groups displayed statistical significance (P< 0.001). Significant differences were present among the tested groups of the same shade (P< 0.001). Additionally, the data revealed that there were significant differences between the high translucency and the low translucency groups (p < 0.001).;Conclusion: Within the limitations of this study, it is suggested that the translucency and background color significantly influenced the lithium disilicate glass ceramic color among the BL1, A2, and C3 shades. Changing the underlying color from lighter (ND1) to darker (ND4) resulted in increased color differences.
机译：问题陈述：假牙的复制是天然牙齿最困难的挑战之一，尤其是在前牙的单个牙齿修复以及相邻牙齿变色或无生命的情况下；研究目的：目的这项研究的目的是比较半透明性和背景变化对CAD / CAM二硅酸锂玻璃陶瓷不同色调的色差的影响。材料和方法：根据一项初步研究，建议样本量为n = 10。通过CAD / CAM技术制造了三种不同陶瓷阴影（BL1，A2和C3）的二硅酸锂玻璃陶瓷圆柱体（直径12毫米，长度13毫米）。将样品盘切成1.2mm厚和12mm直径的部分。在不同的阴影中考虑了透明度和背景色的四种不同组合：第1组（HT ND1），第2组（HT ND4），第3组（LT ND1）和第4组（LT ND4）。每个标本放置在不同的背景下（ND1，ND4）。使用分光光度计测量色差（DeltaE）和DeltaLab。非参数测试（Kruskal-Wallis测试）用于评估测试组之间的颜色差异，后续测试（Mann-Whitney U测试）用于Bonferroni校正。此外，对于每种陶瓷阴影，使用非参数检验（Mann-Whitney U检验）将高透光率组与低透光率组进行比较，以确定透光率对色差的影响。；结果：所有测试组均显示统计学显着性（P <0.001）。在相同阴影的测试组之间存在显着差异（P <0.001）。此外，数据显示高半透明组和低半透明组之间存在显着差异（p <0.001）。结论：在本研究的局限性内，建议半透明和背景颜色显着影响二硅酸锂玻璃BL1，A2和C3阴影之间的陶瓷颜色。将基础颜色从较亮的（ND1）更改为较暗的（ND4）会导致颜色差异增加。

著录项

  • 作者

    Al Ben Ali, Abdulaziz.;

  • 作者单位

    Tufts University School of Dental Medicine.;

  • 授予单位 Tufts University School of Dental Medicine.;
  • 学科 Health Sciences Dentistry.
  • 学位 M.S.
  • 年度 2012
  • 页码 60 p.
  • 总页数 60
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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