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相关概念视频

Effects of EDTA on End-Point Detection Methods01:18

Effects of EDTA on End-Point Detection Methods

Different methods, such as visual observance of metal-ion indicators, spectroscopic techniques, and potentiometric methods, can determine the endpoint of an EDTA titration.
In the visual method, metal-ion indicators (metallochromic dyes), which have distinct colors in their free and complex forms, are added to the mixture to signal the titration's end point. They form stable complexes with metal ions, but these complexes are weaker than the corresponding metal–EDTA complexes. As a result, EDTA...

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Isolation, Characterization and Comparative Differentiation of Human Dental Pulp Stem Cells Derived from Permanent Teeth by Using Two Different Methods
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评估牙颜色的不同方法-在体外研究研究.

Susana Dias1, Joana Dias1, Ruben Pereira1

  • 1Oral Biology and Biochemistry Research Group, Faculdade de Medicina Dentária, Universidade de Lisboa, 1950-044 Lisboa, Portugal.

Biomimetics (Basel, Switzerland)
|September 27, 2023
PubMed
概括

数字色彩评估方法在设备内显示出良好的一致性,但它们之间存在显著差异. 临床医生在使用VITA Classical和VITA Toothguide 3D-MASTER指南的SpectroShade和eLAB时应该意识到这种变化.

关键词:
斯佩克托影子的影子电子标签 (eLAB) 是一个电子标签.摄影摄影摄影摄影摄影摄影摄影摄影摄影摄影在光谱光度测试中,光谱光度测量.牙的颜色 牙的颜色

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科学领域:

  • 牙科材料科学 牙科材料科学
  • 测色仪的颜色测量方法
  • 数字成像技术的数字成像.

背景情况:

  • 精确的牙阴影匹配对于美学修复至关重要.
  • 数字色彩评估工具提供了提高准确性的潜力,但可能会表现出变化.
  • 了解设备内部和设备间的变化对于临床应用至关重要.

研究的目的:

  • 为了比较VITA Classical (VC) 和VITA Toothguide 3D-MASTER (VM) 牙阴影指南的L*a*b*值.
  • 使用SpectroShade (SS) 和eLAB数字方法评估颜色差异.
  • 评估这些数字色彩评估工具的设备内部和设备间的可靠性.

主要方法:

  • 一个操作员在三个批次的VC和VM指南中对每个阴影选项卡进行了34次测量.
  • 计算了类内相关系数 (ICC),以评估批次之间的可靠性.
  • 使用独立的t测试 (α = 0.05) 分析了L*a*b*值和颜色差异 (ΔE00).

主要成果:

  • 在所有L*a*b*组件的批次之间发现了优异的ICC值,除了eLAB中的"a*"组件.
  • 对于大多数L*a*b*值,观察到SS和eLAB方法之间的统计学上显著差异.
  • 设备内部的平均 ΔE00 值很低 (0.5-1.1),表明内部的一致性很好.
  • 设备间的平均 ΔE00 值很高 (4.9-5.0),表明方法之间存在显著的变化.

结论:

  • 无论是SpectroShade还是eLAB,都在设备内部表现出良好的内部一致性和可靠性.
  • 在SpectroShade和eLAB方法之间存在显著的变化,特别是对于"a*"组件.
  • 临床医生在使用这些数字工具进行阴影选择时,必须考虑可能存在与方法相关的颜色差异.