Ivica Anja, Šalinović Ivan, Jukić Krmek Silvana, Garoushi Sufyan, Lassila Lippo, Säilynoja Eija, Miletić Ivana
Department of Endodontics and Restorative Dentistry, School of Dental Medicine, University of Zagreb, 10000 Zagreb, Croatia.
Department of Biomaterials Science and Turku Clinical Biomaterial Center-TCBC Institute of Dentistry, University of Turku, 20520 Turku, Finland.
Polymers (Basel). 2024 Feb 23;16(5):607. doi: 10.3390/polym16050607.
The aim of this study was to compare the mechanical properties and ion release from a commercially available resin-modified glass ionomer cement to a formulation reinforced by the addition of short glass fibres at various percentages. Three experimental groups were prepared by adding a mass ratio of 10%, 15% and 20% of short glass fibres to the powder portion of the cement from a capsule (GC Fuji II LC), while the control group contained no fibres. Microhardness (n = 12), fracture toughness, and flexural, compressive and diametral tensile strength (n = 8) were evaluated. To study ion release, readings were obtained utilising fluoro-selective and calcium-selective electrodes after 24 h, 7 days and 30 days (n = 12). The spatial distribution of fibres within the material was evaluated through scanning electron microscopy. The data were analysed using one-way ANOVA with a Bonferroni adjustment. The findings suggest that elevating fibre weight ratios to 20 wt% results in improved mechanical properties ( < 0.05) in microhardness, flexural strength, diametral tensile strength and fracture toughness. In terms of ion release, a statistically significant difference ( < 0.001) was observed between the groups at the conclusion of 24 h and 7 days, when the fluoride release was much higher in the control group. However, after 30 days, no significant distinction among the groups was identified ( > 0.05). Regarding calcium release, no statistically significant differences were observed among the groups at any of the evaluated time points ( > 0.05). SEM showed the fibres were homogeneously incorporated into the cement in all experimental groups. Resin-modified glass ionomer enhanced with short glass fibres at a weight loading of 20% showcased the most favourable mechanical properties while concurrently maintaining the ability to release fluoride and calcium after a 30-day period.
本研究的目的是比较市售树脂改性玻璃离子水门汀与添加不同百分比短玻璃纤维增强配方的力学性能和离子释放情况。通过向胶囊装水泥（GC Fuji II LC）的粉末部分添加质量比为10%、15%和20%的短玻璃纤维制备了三个实验组，而对照组不含纤维。评估了显微硬度（n = 12）、断裂韧性以及弯曲、压缩和径向拉伸强度（n = 8）。为了研究离子释放情况，在24小时、7天和30天后使用氟选择性和钙选择性电极进行读数（n = 12）。通过扫描电子显微镜评估材料中纤维的空间分布。使用单因素方差分析并进行Bonferroni校正对数据进行分析。研究结果表明，将纤维重量比提高到20 wt%可改善显微硬度、弯曲强度、径向拉伸强度和断裂韧性方面的力学性能（< 0.05）。在离子释放方面，在24小时和7天结束时，各实验组之间观察到统计学上的显著差异（< 0.001），此时对照组的氟释放量要高得多。然而，30天后，各实验组之间未发现显著差异（> 0.05）。关于钙释放，在任何评估时间点各实验组之间均未观察到统计学上的显著差异（> 0.05）。扫描电子显微镜显示，在所有实验组中纤维均均匀地掺入到水泥中。重量加载为20%的短玻璃纤维增强的树脂改性玻璃离子水门汀在30天后同时展现出最有利的力学性能以及释放氟和钙的能力。
