树脂水泥的聚合通过自固化与或没有粘合剂处理
Su Young Lee1, Yasushi Shimada2, Alireza Sadr3
1Department of Prosthodontics, Seoul St. Mary's Dental Hospital, College of Medicine, The Catholic University of Korea.
Dental materials journal
|January 19, 2025
概括
这项研究发现,使用粘合剂会影响树脂水泥的转化程度和基复原中的界面间隙. 选择粘合剂,水泥和聚合方法显著影响这些结果.
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
- 恢复性牙科 恢复性牙科
背景情况:
- 树脂水泥在牙科修复中广泛使用,特别是与合金.
- 优化树脂水泥的特性,如转换度 (DC) 和最大限度地减少接口间隙,对于恢复寿命至关重要.
- 粘合剂在聚合过程中影响这些性能的作用需要进一步研究.
研究的目的:
- 为了评估树脂水泥在有或没有粘合剂聚合时的转化度 (DC) 的差异.
- 为了比较在自我固化的条件下用树脂水泥固的基复原的界面间隙.
- 为了确定不同粘合剂,水泥和聚合方法对DC和界面间隙的影响.
主要方法:
- 树脂水泥转化度 (DC) 被测量有或没有粘合剂处理,包括光固化和自固化.
- 在提取的牙中准备了内嵌腔,并制造和固了石修复.
- 在热循环后,使用扫源光学连贯性断层扫描 (SS-OCT) 评估了修复牙接口的接口间隙.
主要成果:
- 树脂水泥的转化度 (DC) 根据使用的粘合剂,水泥类型和聚合法 (p<0.05) 显著不同.
- 在接口间隙中观察到显著的差异,取决于所使用的特定粘合剂和树脂水泥 (p<0.05).
结论:
- 粘合剂的应用,水泥的选择和聚合技术极大地影响了树脂水泥的转化程度.
- 粘合剂和水泥之间的相互作用会影响石修复的边际完整性,这是通过界面间隙测量所表明的.
相关概念视频
01:20Curing of Concrete
88
The hydration of cement takes place within the water-filled capillary pores. However, environmental elements can disrupt this process by evaporating water from the concrete surfaces. Sealed concrete with a water-cement ratio below 0.5 experiences self-desiccation, leading to water loss. The water loss in concrete is mitigated by curing. This technique involves keeping the concrete saturated to maintain the necessary temperature and moisture conditions, to optimally fill the spaces in the cement...
88
01:26Curing Methods
71
Concrete members with a small surface-to-volume ratio are cured by oiling and moistening the forms before casting the concrete member. These forms can be left in place for a prolonged period to prevent moisture loss, and can be wetted if made of a material suitable for wetting. If the forms are removed early, the concrete member is moistened and covered with polythene sheets to maintain moisture. For large horizontal concrete surfaces exposed to dry weather, a temporary covering is suspended...
71
01:25Accelerated Curing of Concrete
108
Accelerating concrete curing is achieved by applying heat and additional moisture. This process accelerates the hydration of the cement, resulting in an earlier strength gain in the concrete. Steam curing is a method wherein the concrete products are either transported through a chamber on a conveyor belt or encased in plastic, allowing steam at atmospheric pressure to circulate freely around them. This process begins with a phase of moist curing that typically lasts between 3 to 5 hours, after...
108
00:57Cationic Chain-Growth Polymerization: Mechanism
2.2K
The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
2.2K
01:20Anionic Chain-Growth Polymerization: Overview
2.1K
The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
2.1K
01:12Setting Time of Cement
143
The setting time of cement refers to the process of cement paste transitioning from a plastic state to a solid state. This process is crucial in construction as it dictates the timeframe for concrete placement, compaction, and finishing. The onset of this solidification is termed the initial set, indicating when the paste becomes unworkable. The final set is when the paste has solidified completely, and further handling or manipulation can no longer affect its shape. The cement strength is...
143