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相关概念视频

Shrinkage in Concrete01:27

Shrinkage in Concrete

Shrinkage in concrete is primarily due to water loss from evaporation, hydration of cement, or carbonation, leading to a reduction in volume. The volumetric contraction results in volumetric strain in concrete. However, in practice, shrinkage is measured as linear strain, which is one-third of the volumetric strain.
When concrete is still in its plastic state, it can undergo a decrease in volume by about 1% of its absolute volume. This decrease is known as plastic shrinkage. It arises either...

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相关实验视频

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Shrinkage of Dental Composite in Simulated Cavity Measured with Digital Image Correlation
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比较聚合收缩测量方法用于通用阴影可流动树脂基复合材料的聚合收缩测量方法

Mayumi Maesako1, Nicholas G Fischer2, Nagisa Matsui1

  • 1Department of Operative Dentistry, Aichi Gakuin School of Dentistry, Nagoya 464-8651, Japan.

Biomimetics (Basel, Switzerland)
|December 27, 2024
PubMed
概括
此摘要是机器生成的。

全面阴影可流动复合材料呈现不同的聚合收缩,影响牙修复. 大量基础HARD II中流流量表现出最小的收缩,但测量方法也显著影响了结果.

关键词:
聚合物化的收缩缩减.发光测量 (pycnometry) 是一种测量方法.树脂复合材料 树脂复合材料修复性牙科 修复性牙科是指恢复性牙科.全面的阴影 普遍的阴影

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Detection and Removal of Tooth-Colored Composite Resin Using the Fluorescence-Aided Identification Technique
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科学领域:

  • 牙科材料科学 牙科材料科学
  • 生物材料工程 生物材料工程
  • 聚合物化学 聚合物化学

背景情况:

  • 全面阴影可流动复合材料旨在通过减少颜色匹配问题和手术时间来简化牙科修复.
  • 然而,这些树脂基复合材料 (RBC) 的聚合收缩仍然是一个问题,可能导致术后敏感性和恢复失败.

研究的目的:

  • 为了比较最近引入的通用阴影可流动红细胞的聚合收缩.
  • 评估两种不同的测量方法 (湿密度和干密度) 对收缩评估的影响.

主要方法:

  • 聚合收缩是通过测量非聚合和聚合RBC的密度差异来计算的,使用ISO 17304 (湿法) 和气体位移测量 (干法).
  • 用扫描电子显微镜进行填充颗粒可视化.

主要成果:

  • 在测试的通用阴影可流动红细胞中观察到聚合收缩的显著变化.
  • 与所有其他材料相比,散装HARD II中流体表现出明显较低的聚合收缩率.
  • 测量方法的收缩值显著不同,湿法通常比干法收缩少,尽管发生了像Gracefil LoFlow这样的例外.

结论:

  • 聚合缩水在通用阴影可流动RBC之间有很大差异,受材料组成和使用的测量技术的影响.
  • 测量聚合缩小的准确和标准化方法对于推进生物仿真临床牙科至关重要.