基于聚氨的新型密封器的扩张体积和扩张功率
Mohammad Ali Saghiri1, Julia Vakhnovetsky2, Anna Vakhnovetsky3
1Department of Restorative Dentistry, Rutgers School of Dental Medicine, Newark, New Jersey; Department of Endodontics, University of the Pacific, Arthur A. Dugoni School of Dentistry, San Francisco, California.
Journal of endodontics
|June 5, 2023
概括
基于聚氨的新型根管密封器比传统密封器显著增加扩张体积,但不会增加扩张功率. 这一发现对于改善根管填充和长期治疗成功至关重要.
科学领域:
- 生物材料科学 生物材料科学
- 牙周内科医院 牙周内科医院 牙周内科医院
- 牙科材料 牙科材料
背景情况:
- 根管密封器的收缩和差的界面适应性损害了内牙治疗的结果.
- 评估新型密封剂对于增强根管填充和密封能力至关重要.
研究的目的:
- 评估三种基于聚氨的新型根管密封器的体积和扩张功率.
- 将这些新型密封剂与已建立的环氧树脂 (AH Plus) 和酸基 (EndoSequence BC) 密封剂进行比较.
- 研究这些材料的体积和膨胀力之间的关系.
主要方法:
- 使用塑料和钢瓶测量体积和膨胀力,分别超过72小时.
- 测试了五种密封剂:聚氨可扩展密封剂 (PES),天 + PES (ZPES),弹性聚氨密封剂 (EPS),AH Plus和EndoSequence BC.
- 统计分析包括科尔莫戈罗夫-斯米尔诺夫,单向ANOVA,图基的后期和皮尔森相关性测试.
主要成果:
- 与AH Plus和EndoSequence BC相比,基于聚氨的密封剂 (PES,ZPES,EPS) 显示出明显更高的扩张体积.
- 在测试的根填充材料中没有观察到扩张功率的显著差异.
- 对于任何密封器,扩张的体积和功率之间没有发现显著的相关性.
结论:
- 基于聚氨的密封剂提供了显著更大的扩张体积,可能改善根通道的界面适应性.
- 尽管增加了体积,但这些新型密封器的膨胀力并没有显著增加.
- 需要进一步的研究,以充分理解这些扩张特性对内牙治疗成功的临床影响.
相关概念视频
Molecular Weight of Step-Growth Polymers
2.2K
Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
2.2K
Thermal Expansion
4.4K
The expansion of alcohol in a thermometer is one of many commonly encountered examples of thermal expansion, which is the change in size or volume of a given system as its temperature changes. The most visible example is the expansion of hot air. When air is heated, it expands and becomes less dense than the surrounding air, which then exerts an upward force on the hot air to, for example, make steam and smoke rise, and hot air balloons float. The same behavior happens in all liquids and gases,...
4.4K
Superplasticizers
106
Superplasticizers are advanced admixtures that enhance the workability of concrete by lowering the water content without compromising the strength of the material. These substances are highly effective water reducers, improving concrete flow, making it easier to work with, and enabling concrete to reach inaccessible areas or densely reinforced sections without mechanical vibration. The key components in superplasticizers are either sulfonated melamine or naphthalene formaldehyde condensates,...
106
Expansion and Contraction in Masonry Walls
992
Masonry walls are subject to slight expansion and contraction due to variations in temperature and moisture. Thermal movement in masonry is relatively straightforward to measure and plan for. On the other hand, moisture movement poses more of a challenge. New clay masonry units typically absorb water and expand over time under normal environmental conditions. Conversely, new concrete masonry units tend to shrink as they lose the excess moisture acquired during their production process.
To...
To...
992
Soundness of Cement
205
The soundness of cement refers to the ability of cement paste to retain its volume after setting. Unsound cement can lead to expansion and structural damage due to the presence of free lime, magnesia, and calcium sulfate. Free lime hydrates very slowly, expanding and causing unsoundness, which is difficult to detect because it intercrystallizes with other compounds. Magnesia also reacts with water, forming crystals that can disrupt the cement's structure. Calcium sulfate can create...
205
Types of Step-Growth Polymers: Polyesters
2.3K
The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the...
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the...
2.3K


