Department of Operative Dentistry, Bauru Dental School, University of São Paulo, Brazil.
J Appl Oral Sci. 2004 Dec;12(4):344-8. doi: 10.1590/s1678-77572004000400017.
The aim of this study was to compare, in different periods of time, the compressive and diametral tensile strength of a traditional high viscous glass ionomer cement: Fuji IX (GC Corporation), with two new Brazilian GIC's: Vitro-Molar (DFL) and Bioglass R (Biodinamica), all indicated for the Atraumatic Restorative Treatment (ART) technique. Fifteen disk specimens (6.0mm diameter x 3.0mm height) for the diametral tensile strength (DTS) test and fifteen cylindrical specimens (6.0mm diameter x 12.0mm height) for the compressive strength (CS) test were made of each GIC. Specimens were stored in deionized water at 37º C and 100% of humidity in a stove until testing. Five specimens of each GIC were submitted to CS and DTS test in each period, namely 1 hour, 24 hours and 7 days. The specimens were tested in a testing machine (Emic) at a crosshead speed of 1.0mm/min for CS and 0.5mm/min for the DTS test until failure occurred. The data were submitted to two-way ANOVA and Tukey tests (alpha=0.05). The mean CS values ranged from 42.03 to 155.47MPa and means DTS from 5.54 to 13.72 MPa, with test periods from 1h to 7 days. The CS and DTS tests showed no statistically significant difference between Fuji IX and Vitro Molar, except for CS test at 1-hour period. Bioglass R had lowest mean value for CS of the cements tested. In DTS test Bioglass R presented no statistically significant differences when compared with all others tested GICs at 1-hour period and Bioglass R presented no difference at 24-hour and 7-day periods when compared to Vitro-Molar. Further studies to investigate other physical properties such as fracture toughness and wear resistance, as well as chemical composition and biocompatibility, are now needed to better understand the properties of these new Brazilian GIC's.
本研究旨在比较不同时间段传统高粘性玻璃离子体水泥 Fuji IX（GC 公司）与两种新的巴西玻璃离子体水泥 Vitro-Molar（DFL）和 Bioglass R（Biodinamica）的抗压强度和直径拉伸强度，这些材料均被推荐用于无创伤性修复治疗（ART）技术。每个玻璃离子体水泥制作 15 个直径为 6.0mm、高度为 3.0mm 的圆盘试件用于直径拉伸强度（DTS）测试，以及 15 个直径为 6.0mm、高度为 12.0mm 的圆柱试件用于抗压强度（CS）测试。试件在 37°C 和 100%湿度的炉中于去离子水中储存直至测试。每个玻璃离子体水泥在每个时间段（即 1 小时、24 小时和 7 天）都有 5 个试件进行 CS 和 DTS 测试。将试件在试验机（Emic）上以 1.0mm/min 的十字头速度进行 CS 测试和 0.5mm/min 的 DTS 测试，直至试件破坏。数据经双向方差分析和 Tukey 检验（alpha=0.05）处理。CS 的平均数值范围为 42.03 至 155.47MPa，DTS 的平均数值范围为 5.54 至 13.72MPa，测试时间段为 1 小时至 7 天。CS 和 DTS 测试结果显示，除 1 小时 CS 测试外，Fuji IX 和 Vitro Molar 之间没有统计学差异。Bioglass R 的 CS 平均值是测试用水泥中最低的。在 DTS 测试中，Bioglass R 在 1 小时时间段与所有其他测试的玻璃离子体水泥相比没有统计学差异，而在 24 小时和 7 天时间段与 Vitro-Molar 相比没有差异。现在需要进一步研究以调查其他物理性能，如断裂韧性和耐磨性，以及化学成分和生物相容性，以便更好地了解这些新的巴西玻璃离子体水泥的性能。
