使用异甲酸作为稀释剂单体的可流性复合材料的物理化学特性
Roberta Pinto Pereira1, Dayane de Oliveira2, Mateus Garcia Rocha2
1Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba, Departamento de Odontologia Restauradora, Piracicaba, SP, Brasil.
Journal of applied oral science : revista FOB
|September 25, 2024
概括
作为可流动树脂复合材料中的稀释剂单体,伊索波尼尔甲基酸盐 (IBOMA) 有效地降低了聚合缩缩应力,薄膜厚度和水吸附. 然而,它也降低了转换程度和机械性能.
科学领域:
- 材料科学 材料科学 材料科学
- 聚合物化学 聚合物化学
- 牙科材料 牙科材料
背景情况:
- 浮性树脂复合材料在牙科中广泛使用.
- 稀释剂单体影响树脂复合材料的物理化学特性.
- 伊索博尼尔甲基酸盐 (IBOMA) 正在作为一种潜在的稀释剂单体进行研究.
研究的目的:
- 评估IBOMA作为稀释剂单体对实验性可流动树脂复合材料的性能的影响.
- 评估IBOMA与三乙烯糖醇二甲酸盐 (TEGDMA) 结合或替代时的作用.
主要方法:
- 树脂矩阵是由Bis-GMA和IBOMA/TEGDMA混合物组成的.
- 复合材料充满了烟和玻璃颗粒.
- 评估的属性包括聚合收缩应力,转化程度,薄膜厚度,吸收,溶解度,屈曲强度,模量和微硬度.
主要成果:
- 添加/替换IBOMA降低了薄膜厚度,聚合收缩应力,最大聚合率,转换程度,曲模量,水吸收和可溶性.
- 与TEGDMA相比,用IBOMA进行完全替代导致屈曲强度和Knoop微硬度显著降低.
- 在化学软化后,TEGDMA的微硬度降低显著较低.
结论:
- 在可流动复合材料中将IBOMA与TEGDMA结合在一起,可以降低聚合缩水应力,薄膜厚度,水吸附和溶解度,而不会损害Knoop微硬度和屈曲强度.
- 然而,这种组合也降低了转换程度和屈曲强度,并增加了微硬度的降低.
- 伊博玛显示出作为稀释剂单体的潜力,但其最佳使用需要仔细考虑配方.
相关概念视频
03:24Common Ion Effect
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Châtelier’s principle. Consider the dissolution of silver iodide:
01:09Colloidal precipitates
The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
01:17Ion Exchange
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or basic...
01:24A Single-Component System
In the field of chemistry, the terms "component" and "phase" hold significant importance. A component refers to a chemically distinct substance in a system that has specific properties. It is chemically homogeneous, meaning it has the same properties throughout. For example, in a mixture of salt and water, both salt and water are considered separate components because they have different chemical properties.On the other hand, a phase is a form of matter that has a consistent chemical...
01:25Ostwald’s Dilution Law
Consider a binary electrolyte AB with a concentration ‘c’ that reversibly dissociates into its constituent ions. The degree of this dissociation is represented by ⍺. This means that the equilibrium concentration of each ionic species can be expressed as ⍺c. As well as this, the fraction of the electrolyte that remains undissociated at equilibrium is given by (1−⍺). The corresponding equilibrium concentration for this undissociated portion is then calculated as (1−⍺)c. For such solutions,...
01:21Factors Affecting Dissolution: Polymorphism, Amorphism and Pseudopolymorphism
Polymorphism refers to the existence of a drug substance in multiple crystalline forms, known as polymorphs. Recently, this term has been expanded to include solvates (forms containing a solvent), amorphous forms (non-crystalline forms), and desolvated solvates (forms from which the solvent has been removed).
Some polymorphic crystals possess lower aqueous solubility than their amorphous counterparts, leading to incomplete absorption. For instance, the oral suspension of Chloramphenicol, which...
Some polymorphic crystals possess lower aqueous solubility than their amorphous counterparts, leading to incomplete absorption. For instance, the oral suspension of Chloramphenicol, which...