Chai John, Takahashi Yutaka, Hisama Kazuhiro, Shimizu Hiroshi
Northwestern University, Evanston, Illinois, USA.
Int J Prosthodont. 2005 Jan-Feb;18(1):28-33.
The effect of water sorption on the flexural strength and flexural modulus of three fiber-reinforced composites was studied.
Bar-shaped specimens of each material were prepared according to the manufacturers' instructions. The flexural strength and modulus of each specimen were tested after the specimens were immersed in distilled water for 1, 7, 60, and 180 days. SEMs were taken to examine the mode of failure. The volume percentage of fiber content of each fiber-reinforced composite was experimentally estimated.
The ascending order of flexural strength and modulus among the materials was generally: FibreKor < Stick < Vectris. The flexural strengths of Stick and FibreKor specimens at 1 and 180 days were not significantly different. Although the 180-day Vectris specimens possessed significantly lower flexural strength than the 1-day specimens, the flexural strengths of Vectris specimens at 1, 7, 60, and 180 days remained significantly higher than those of Stick and FibreKor. The difference in flexural modulus for each fiber-reinforced composite related to the duration of water immersion was not significant.
Water immersion affected the flexural strengths of the three composites to a different degree but did not affect their flexural moduli significantly. For each duration of water immersion, the flexural property of the fiber-reinforced composite, in ascending order of significant difference, was: FibreKor < Stick < Vectris.
研究吸水率对三种纤维增强复合材料的弯曲强度和弯曲模量的影响。
按照制造商的说明制备每种材料的棒状试样。将试样浸泡在蒸馏水中1、7、60和180天后,测试每个试样的弯曲强度和模量。采用扫描电子显微镜观察破坏模式。通过实验估算每种纤维增强复合材料的纤维含量体积百分比。
材料之间弯曲强度和模量的升序排列通常为:FibreKor < Stick < Vectris。Stick和FibreKor试样在1天和180天时的弯曲强度没有显著差异。尽管180天的Vectris试样的弯曲强度明显低于1天的试样,但Vectris试样在1、7、60和180天时的弯曲强度仍显著高于Stick和FibreKor。每种纤维增强复合材料的弯曲模量与水浸持续时间的差异不显著。
水浸对三种复合材料的弯曲强度有不同程度的影响,但对其弯曲模量没有显著影响。对于每个水浸持续时间,纤维增强复合材料的弯曲性能按显著差异升序排列为:FibreKor < Stick < Vectris。