Static and cyclic loading of fiber-reinforced dental resin
Static and cyclic loading of fiber-reinforced dental resin
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DOI：
10.1016/s0109-5641(02)00034-9
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发表时间：
2003-05-01
期刊：
影响因子：
5
通讯作者：
Bapna, MS
中科院分区：
文献类型：
--
作者：
Drummond, JL;Bapna, MS
目的：本研究的目的是评估单向纤维增强树脂的抗弯强度的静态和循环载荷下，并没有thermal cycling.Methods：纤维增强树脂材料选择这个项目是市售的牙髓桩和商业采购的酒吧样品。对于所有材料，使用三点加载在空气和水中测试挠曲强度对照品。将样本在7至63 ℃之间进行热循环6000次。一个楼梯的方法被用来确定的弯曲疲劳极限和扫描显微镜被用来检查microstructure.Results：碳/石墨纤维增强树脂桩和玻璃FiberKor后显着强于陶瓷（氧化锆）和其他玻璃纤维增强树脂材料。热循环导致每种树脂基桩系统的挠曲强度显著降低（11-24%）。陶瓷桩系统仅减少2%。此外，对于标准尺寸的玻璃纤维增强树脂棒，在空气和水中的测试之间没有显着差异，观察，但静态和循环加载之间的显着差异noted.Significance：由于热循环和这些材料的循环加载的强度性能的下降表明，它们在口腔环境中的使用增强了它们的降解，并可能缩短其临床寿命。(C)2003年牙科材料学院。由Elsevier Science Ltd.出版，版权所有。
Objective: The aim of this study was to evaluate the flexure strength of unidirectional fiber-reinforced resins under static and cyclic loading with and without thermal cycling.Methods: The fiber-reinforced resin materials chosen for this project were commercially available endodontic posts and commercially procured bar samples. For all materials, controls for flexure strength were tested in air and in water using three-point loading. Specimens were thermal cycled between 7 and 63degreesC for 6000 cycles. A staircase approach was used to determine the flexure fatigue limit and scanning microscopy was used to examine the microstructure.Results: The carbon/graphite fiber-reinforced resin posts and the glass FiberKor posts were significantly stronger than the ceramic (zirconia) and the other glass-reinforced resin materials. Thermal cycling caused a significant lowering (11-24%) of the flexure strength for each resin based post system. The ceramic post system decreased only by 2%. Further, for standard size glass fiber-reinforced resin bars, no significant differences between testing in air and water was observed, but a significant difference between static and cyclic loading was noted.Significance: The decreases in the strength property due to thermal cycling and the cyclic loading of these materials indicates that their utilization in the oral environment enhances their degradation, and potentially shortens their clinical life. (C) 2003 Academy of Dental Materials. Published by Elsevier Science Ltd. All rights reserved.