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相关概念视频

Masking and Demasking Agents01:19

Masking and Demasking Agents

2.4K
EDTA titrations may necessitate masking and demasking agents to temporarily protect a particular metal ion in a mixture from the EDTA reaction. These agents facilitate the sequential analysis of the metal ions by forming stable complexes with some—but not all—metal ions during certain steps.
There are many masking agents, such as cyanide, fluoride, triethanolamine, thiourea, and 2,3-bis(sulfanyl)propan-1-ol (formerly 2,3-dimercapto-1-propanol), with the masking agent chosen based on...
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Preparation of Samples for Electron Microscopy01:20

Preparation of Samples for Electron Microscopy

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To be visualized by an electron microscope, either transmission or scanning, biological samples need to be fixed (stabilized) so the electron beam does not destroy them and dried thoroughly (desiccated/dehydrated) so the vacuum does not affect them. Fixation needs to be done as quickly as possible because the sample properties will start changing as soon as it is removed from its natural environment. For example, in a tissue sample, the oxygen levels begin decreasing, causing an altered...
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Effects of EDTA on End-Point Detection Methods01:18

Effects of EDTA on End-Point Detection Methods

272
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...
272

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相关实验视频

Updated: Jun 23, 2025

Development of Amelogenin-chitosan Hydrogel for In Vitro Enamel Regrowth with a Dense Interface
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选择性乳蚀刻技术的选择性乳蚀刻技术

Mark A Koup1, Markus B Blatz2

  • 1Clinical Associate Professor, Division of Restorative Dentistry, University of Pennsylvania School of Dental Medicine, Philadelphia, Pennsylvania; Fellow, Academy of General Dentistry; Private Practice, Paoli, Pennsylvania.

Compendium of continuing education in dentistry (Jamesburg, N.J. : 1995)
|June 20, 2024
PubMed
概括

选择性质蚀刻通过选择性地将酸涂在质上而不是牙上来提高牙粘合剂的粘合强度. 目前的证据支持这种技术,以获得最佳的牙修复结果.

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Micro-dissection of Enamel Organ from Mandibular Incisor of Rats Exposed to Environmental Toxicants
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Sampling and Pretreatment of Tooth Enamel Carbonate for Stable Carbon and Oxygen Isotope Analysis
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Micro-dissection of Enamel Organ from Mandibular Incisor of Rats Exposed to Environmental Toxicants
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科学领域:

  • 牙科材料科学 牙科材料科学
  • 恢复性牙科 恢复性牙科
  • 粘合式牙科 粘合式牙科

背景情况:

  • 粘合性牙科对于直接和间接的修复至关重要.
  • 关于自蚀刻和通用粘合剂在质制备上的有效性存在争议.
  • 最佳的结合强度对于恢复寿命至关重要.

研究的目的:

  • 为了评估选择性质蚀刻技术的有效性.
  • 为临床医生提供指导,以实现牙粘合剂的理想结果.
  • 为了解决人们对当前粘合剂系统的牙制备的担忧.

主要方法:

  • 关于牙粘合技术的当前科学文献的综述.
  • 对研究进行分析,将选择性乳蚀刻与其他方法进行比较.
  • 探索酸在腔室制剂中的应用方案.

主要成果:

  • 选择性乳蚀刻技术涉及将酸仅应用于乳表面.
  • 这种方法避免了蚀刻牙,解决了人们对结合强度的担忧.
  • 目前的证据主要支持使用选择性乳蚀刻.

结论:

  • 选择性面膜蚀刻技术推用于大多数粘合剂系统.
  • 这种技术增强了对质的准备,以获得最佳的结合强度.
  • 临床医生被指导在粘合性牙科中取得卓越的结果.