Yap A U J, Cheang P H N, Chay P L
Institute of Materials Research and Engineering, Department of Restorative Dentistry, Faculty of Dentistry, Center for Biomedical Materials Applications and Technology, National University of Singapore, Singapore.
J Oral Rehabil. 2002 Jul;29(7):682-8. doi: 10.1046/j.1365-2842.2002.00908.x.
This study investigated the mechanical properties (hardness, compressive and diametral tensile strength) of two restorative reinforced glass-ionomer cements (GC Fuji IX GP and Miracle Mix). The mechanical properties of the two cements were compared after 1 day, 1 week and 1 month storage in distilled water at 37 degrees C. Hardness testing (VHN) was carried out with a digital microhardness tester (load = 50 g, dwell time = 30 s) and compressive/diametral tensile strength testing (MPa) was conducted based upon British Standard Specification for Glass-Ionomer Cements (BS 6039: 1981). Results were analysed using analysis of variance (ANOVA)/Scheffe's test and independent samples t-test (P < 0.05). Mechanical properties generally increased with time for both cements. Hardness at 1 day was significantly lower than that at 1 week and 1 month. No significance difference in compressive and diametral tensile strengths was observed between the different time intervals. After 1 month storage in water, no significant difference in hardness and compressive strength was observed between Fuji IX and Miracle. The diametral tensile strength of Fuji IX was, however, significantly greater than that of Miracle Mix at all time intervals. Fuji IX GP may serve as a potential substitute for Miracle Mix.
本研究调查了两种增强型玻璃离子水门汀修复材料（GC Fuji IX GP和Miracle Mix）的力学性能（硬度、抗压强度和径向拉伸强度）。将两种水门汀在37℃蒸馏水中储存1天、1周和1个月后，比较它们的力学性能。使用数字显微硬度计（载荷 = 50 g，保压时间 = 30 s）进行硬度测试（维氏硬度），并根据英国玻璃离子水门汀标准规范（BS 6039: 1981）进行抗压/径向拉伸强度测试（MPa）。结果采用方差分析（ANOVA）/谢费检验和独立样本t检验进行分析（P < 0.05）。两种水门汀的力学性能一般都随时间增加。1天时的硬度显著低于1周和1个月时的硬度。在不同时间间隔之间，抗压强度和径向拉伸强度未观察到显著差异。在水中储存1个月后，Fuji IX和Miracle在硬度和抗压强度方面未观察到显著差异。然而，在所有时间间隔内，Fuji IX的径向拉伸强度均显著高于Miracle Mix。Fuji IX GP可能可作为Miracle Mix的潜在替代品。
