基于光学连贯性断层扫描的数字图像相关性分析对聚合缩小的评估-第二部分:修复复合材料的影响
Wei-Chi Chen1, Ting-Weng Lai2, Chia-Ling Li3
1School of Dentistry and Institute of Oral Medicine, National Cheng Kung University, Tainan, Taiwan; Department of Dentistry, Sin-Lau Hospital, Tainan, Taiwan.
概括
流动性树脂复合材料表现出最高的聚合收缩率,可能导致界面间隙. 这项研究使用光学连贯断层扫描 (OCT) 和数字图像相关性 (DIC) 来分析不同牙科复合材料的收缩.
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:
- 基于树脂的复合材料 (RBC) 在牙科修复中被广泛使用.
- 了解聚合收缩对于预测恢复寿命和性能至关重要.
- 目前用于分析收缩的方法可能无法全面捕捉动态过程.
研究的目的:
- 研究不同树脂基复合材料 (RBC) 的聚合收缩.
- 用光学连贯断层扫描 (OCT) 和数字图像相关性 (DIC) 来评估收缩行为.
- 检查聚合过程中的界面适应和解.
主要方法:
- 三个RBC (菲尔特克Z350XT,Z350Flowable,BulkFill后部) 进行了测试.
- 测量了折射率 (RI),以校准OCT轴尺寸.
- 牛切口的I类腔被填充在非结合和结合的条件下.
- 在20秒光聚合过程中,OCT成像捕获了恢复.
- DIC软件分析了OCT图像的收缩和界面适应.
主要成果:
- 浮性复合材料 (Z350F) 在非结合的修复中显示出最大的垂直收缩 (-16.75μm).
- 大量填充和Z350的收缩率较小 (分别为-8.81微米和-5.97微米).
- 结合条件增加了收缩位移;在非结合的Z350和Z350F中观察到显著的界面间隙.
结论:
- 基于OCT的DIC分析提供了一种全面的方法来研究复合材料的收缩和解.
- 浮性复合材料具有最高的聚合收缩率.
- 不结合的常规复合材料在聚合过程中可能会发生收缩方向的变化.
相关概念视频
Shrinkage in Concrete
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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.
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Drying Shrinkage
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When hardened concrete is exposed to air with a relative humidity of less than 100 percent, it begins to lose the free water within its capillaries. As this water evaporates, the water initially adsorbed onto the calcium silicate hydrates migrates towards these now empty spaces and eventually evaporates as well. Over time, as more water leaves, the volume of the concrete decreases, a phenomenon known as drying shrinkage.
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