Ellakuria J, Triana R, Mínguez N, Soler I, Ibaseta G, Maza J, García-Godoy F
Department of Stomatology, Faculty of Medicine and Odontology, University of the Basque Country, 48940-Leioa, Vizcaya, Spain.
Dent Mater. 2003 Jun;19(4):286-90. doi: 10.1016/s0109-5641(02)00042-8.
Conventional and resin-modified glass-ionomer cements (GIC, RM-GIC) are available for clinical use as restorative materials or as liners and bases. This study was conducted to compare the effect of a 12-month storage period in water on the surface microhardness, measured in Vickers units (VH), between a GIC and a RM-GIC group and to determine if the addition of resins improved the GIC microhardness.
VH microhardness was assessed in three GIC: Ketac-Fil, Ketac-Molar and Ketac-Silver (KF, KM, KS) and three RM-GIC: Photac-Fil, Fuji II LC and Vitremer (PF, FU, VI) stored in distilled water at 37 degrees C for 12 months. Measurements were taken at 1, 7, 15, 30, 90, 180 and 365 days. The statistical evaluation was done by means of one-way analysis of variance (ANOVA) and Tukey's multiple comparison tests.
There are significant VH differences among the materials studied and within each material over storage time. GICs, except for KS, showed a higher VH throughout the study period. Among the RM-GIC, VI showed a significantly higher VH at 12 months than at 1 day. The VH of PF diminished in the final stage of the study, whereas that of FU stabilized.
The results suggest that the addition of resins to the GIC did not appear to improve the surface microhardness of these materials. Furthermore, the surface microhardness of both the conventional and resin-modified glass-ionomers suffered variations over time. However, these materials should not be deemed inadequate for use in clinical applications. Probably, conventional and resin-modified GICs placed in the oral environment would not be affected to the same extent as in in vitro tests.
传统玻璃离子水门汀和树脂改性玻璃离子水门汀（GIC、RM - GIC）均可作为修复材料或衬层及基底材料用于临床。本研究旨在比较GIC组和RM - GIC组材料在水中储存12个月后以维氏硬度单位（VH）测量的表面显微硬度，并确定树脂的添加是否能提高GIC的显微硬度。
对三种GIC（Ketac - Fil、Ketac - Molar和Ketac - Silver，即KF、KM、KS）和三种RM - GIC（Photac - Fil、Fuji II LC和Vitremer，即PF、FU、VI）在37℃蒸馏水中储存12个月后进行VH显微硬度评估。在第1、7、15、30、90、180和365天进行测量。采用单因素方差分析（ANOVA）和Tukey多重比较检验进行统计学评估。
在所研究的材料之间以及每种材料在储存期间的VH存在显著差异。除KS外，GIC在整个研究期间显示出较高的VH。在RM - GIC中，VI在12个月时的VH显著高于1天时。PF的VH在研究后期降低，而FU的VH则稳定。
结果表明，向GIC中添加树脂似乎并未改善这些材料的表面显微硬度。此外，传统玻璃离子水门汀和树脂改性玻璃离子水门汀的表面显微硬度均随时间发生变化。然而，这些材料不应被认为不适用于临床应用。可能放置在口腔环境中的传统和树脂改性GIC不会受到与体外试验相同程度的影响。
