Mechanical properties and microstructures of glass-ionomer cements
Mechanical properties and microstructures of glass-ionomer cements
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DOI：
10.1016/s0109-5641(99)00093-7
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发表时间：
2000-03-01
期刊：
影响因子：
5
通讯作者：
Wang, G
中科院分区：
文献类型：
--
作者：
Xie, D;Brantley, WA;Wang, G
目的：本研究的目的是确定 10 种商用玻璃离子水门汀 (GIC) 的弯曲强度 (FS)、压缩强度 (CS)、径向拉伸强度 (DTS)、努普硬度 (KHN) 和耐磨性。使用扫描电子显微镜 (SEM) 技术检查这些水泥的断裂表面，以确定这些水泥的机械性能和微观结构之间的关系。方法：根据每个制造商的说明制作样本。将样品在 37 摄氏度的蒸馏水中浸泡 7 天后，测量 FS、CS、DTS、KHN 和磨损率。使用事后 Tukey-Kramer 多范围测试的单向方差分析来确定哪些样品组在每次测试中存在显着差异。使用扫描电子显微镜检查 FS 测试中每个 GIC 的一个代表性样品的断裂表面。 结果：与传统 GIC (C GIC) 相比，树脂改性 GIC (RM GIC) 表现出更高的 FS 和 DTS，但 CS 并不普遍较高，努普硬度通常较低，耐磨性普遍较低。 Vitremer (3M) 的 FS 和 DTS 值最高； Fuji II LC (GC International) 和 Ketac-Molar (ESPE) 的 CS 最高； Ketac-Fil (ESPE) 的 KHN 最高。 Ketac-Bond (ESPE) 的 FS 最低； α-Silver（DMG-汉堡）的 CS 最低。四种 GIC（alpha-Fil (DMG-Hamburg)、alpha-Silver、Ketac-Bond 和 Fuji II）的 DTS 值最低，彼此之间没有显着差异； α-Silver 和 Ketac-Silver 的 KHN 值最低。 α-Silver 和 Ketac-Fil 表现出最高的耐磨性； F2LC的耐磨性最低。 C GIC 表现出脆性行为，而 RM GIC 在压缩过程中经历了显着的塑性变形。微观结构越集成，FS 和 DTS 越高。较高的 CS 与较小的玻璃颗粒相关，并且在较小的玻璃颗粒和较低的孔隙率组合的情况下发现较高的 KHN。较大的玻璃粒径和更完整的微观结构有助于提高耐磨性。意义：GIC 的机械性能与其微观结构密切相关。玻璃颗粒和聚合物基体之间界面的完整性、颗粒尺寸以及空隙的数量和尺寸等因素在决定机械性能方面具有重要作用。 (C) 2000 年牙科材料学会。由爱思唯尔科学有限公司出版。保留所有权利。
Objective: The objective of this study was to determine the flexural strength (FS), compressive strength (CS), diametral tensile strength (DTS), Knoop hardness (KHN) and wear resistance of ten commercial glass-ionomer cements (GICs). The fracture surfaces of these cements were examined using scanning electron microscopic (SEM) techniques to ascertain relationships between the mechanical properties and microstructures of these cements.Methods: Specimens were fabricated according to the instructions from each manufacturer. The FS, CS, DTS, KHN and wear rate were measured after conditioning the specimens for 7 d in distilled water at 37 degrees C. One-way analysis of variance with the post hoc Tukey-Kramer multiple range test was used to determine which specimen groups were significantly different for each test. The fracture surface of one representative specimen of each GIC from the FS tests was examined using a scanning electron microscope.Results: The resin-modified GICs (RM GICs) exhibited much higher FS and DTS, not generally higher CS, often lower Knoop hardness and generally lower wear resistance, compared to the conventional GICs (C GICs). Vitremer (3M) had the highest values of FS and DTS; Fuji II LC (GC International) and Ketac-Molar (ESPE) had the highest CS; Ketac-Fil (ESPE) had the highest KHN. Ketac-Bond (ESPE) had the lowest FS; alpha-Silver (DMG-Hamburg) had the lowest CS. Four GICs (alpha-Fil (DMG-Hamburg), alpha-Silver, Ketac-Bond and Fuji II) had the lowest values of DTS, which were not significantly different from each other; alpha-Silver and Ketac-Silver had the lowest values of KHN. The highest wear resistance was exhibited by alpha-Silver and Ketac-Fil; F2LC had the lowest wear resistance. The C GICs exhibited brittle behavior, whereas the RM GICs underwent substantial plastic deformation in compression. The more integrated the microstructure, the higher were the FS and DTS. Higher CS was correlated with smaller glass particles, and higher KHN was found where there was a combination of smaller glass particles and lower porosity. Larger glass particle sizes and a more integrated microstructure contributed to a higher wear resistance.Significance: The mechanical properties of GICs were closely related to their microstructures. Factors such as the integrity of the interface between the glass particles and the polymer matrix, the particle size, and the number and size of voids have important roles in determining the mechanical properties. (C) 2000 Academy of Dental Materials. Published by Elsevier Science Ltd. All rights reserved.