Piwowarczyk Andree, Ottl Peter, Lauer Hans-Christoph, Büchler Alfred
Department of Prosthetic Dentistry, School of Dentistry, Johann Wolfgang Goethe University, Theodor-Stern-Kai 7, D-60590 Frankfurt, Germany.
J Prosthodont. 2002 Jun;11(2):86-91.
The study evaluates the compressive, flexural, and diametral tensile strengths of 8 core build-up materials from different material classes (highly viscous glass ionomer cement, autocured resin composite, and compomers).
All materials were manipulated according to the manufacturers' recommendations for use as core materials. At a temperature of 23.0 +/- 1.0 degrees C the properties of compressive, diametral tensile and flexural strength were determined using a universal testing machine at 15 minutes, 1 hour, and 24 hours after material preparation. Using one-way analysis of variance (ANOVA), multiple mean value comparisons were performed to determine significant differences (p< or =.05) between the core restoration materials.
The values for compressive strength varied from 40.3 +/- 5.2 MPa (compomer) to 237.4 +/- 37.3 MPa (autocured resin composite) for the 3 measurement times. At 15 minutes, 1 hour, and 24 hours after first mixing, the ANOVA showed significant differences (p < or =.05) between the resin composite Core Paste and all of the other materials. Diametral tensile strengths ranged from 5.5 +/- 1.1 MPa for glass ionomer cement to 39.1 +/- 2.9 MPa for composite core material. Three-point flexural strength showed values ranging from 12.1 +/- 2.5 MPa for glass ionomer cement to 92.1 +/- 9.7 MPa for compomer between the 3 measurement times.
Setting time influences the mechanical properties of the materials tested in this study. Autopolymerizing resin composite Core Paste demonstrated greater compressive and flexural strengths at the 3 measurement times than the other materials tested. Reinforced composites, in comparison to the autocured resin composites, yielded no improvement in tensile strength. Flexural and tensile strengths of the glass ionomer cement were lower than those of autocured resin composites and compomers.
本研究评估了8种来自不同材料类别的核修复材料（高粘性玻璃离子水门汀、自凝树脂复合材料和复合体）的抗压强度、抗折强度和径向拉伸强度。
所有材料均按照制造商作为核材料使用的建议进行操作。在23.0±1.0摄氏度的温度下，使用万能试验机在材料制备后15分钟、1小时和24小时测定抗压、径向拉伸和抗折强度性能。使用单因素方差分析（ANOVA）进行多个均值比较，以确定核修复材料之间的显著差异（p≤0.05）。
在3个测量时间点，抗压强度值从复合体的40.3±5.2MPa到自凝树脂复合材料的237.4±37.3MPa不等。在初次混合后15分钟、1小时和24小时，方差分析显示树脂复合材料核糊剂与所有其他材料之间存在显著差异（p≤0.05）。径向拉伸强度范围从玻璃离子水门汀的5.5±1.1MPa到复合核材料的39.1±2.9MPa。在3个测量时间点之间，三点抗折强度值从玻璃离子水门汀的12.1±2.5MPa到复合体的92.1±9.7MPa不等。
凝固时间影响本研究中测试材料的力学性能。在3个测量时间点，自凝树脂复合材料核糊剂的抗压强度和抗折强度均高于其他测试材料。与自凝树脂复合材料相比，增强复合材料的拉伸强度没有提高。玻璃离子水门汀的抗折强度和拉伸强度低于自凝树脂复合材料和复合体。
