Cengiz Seda, Bagis Bora, Külünk Şafak, Velioğlu Neslin, Sağlam Gaye
Department of Prosthodontics, Faculty of Dentistry, Zonguldak Bülent Ecevit University, Zonguldak, Turkey.
Department of Prosthodontics, Faculty of Dentistry, İstanbul Health and Technology University, Istanbul, Turkey.
Microsc Res Tech. 2023 Feb;86(2):252-257. doi: 10.1002/jemt.24266. Epub 2022 Nov 21.
This study aimed to compare the effect of fiber reinforcing methods on the flexural strength and failure modes of indirect composite resins. Based on the reinforcement methods, the bar specimens (3 × 3 × 25 mm) were divided into five groups (n = 20). Glass or polyethylene fibers were used for reinforcement of indirect composite resins. Fibers were either light polymerized and mixed with indirect composite resin or mixed with indirect composite resin after resin application and polymerized together. Indirect composite resin without fiber reinforcement was used as control. All five types of specimens were stored in distilled water at 37°C for 24 h. Half of the specimens were additionally thermocycled. Then the specimens were tested in a three-point bending test. Failure types were examined and categorized by using stereo microscope. The data were analyzed using two-way ANOVA and Tukey HSD test. Flexural strength was found to be significantly higher for fiber-reinforced indirect resin composites than control. However, the fiber-reinforced groups did not present any significant difference. Analysis revealed aging does not affect the flexure strength of fiber reinforcement of indirect composite resin. The study concluded that the flexure strength of indirect composite resins was improved with fiber reinforcement. Different fiber reinforcement methods demonstrated similar effects on the flexure strength of indirect composite resin. Reinforcement with glass or polyethylene fibers presented the potential to improve the mechanical properties of indirect composite resins. RESEARCH HIGHLIGHTS: Flexural strength of indirect composite resins are affected by the reinforcement of composites with glass or polyethylene fibers. Aging with thermocycling has no effect on the flexural strength of the indirect composite resins, however can cause catastrophic failures in material.
本研究旨在比较纤维增强方法对间接复合树脂弯曲强度和失效模式的影响。根据增强方法，将条形试件（3×3×25mm）分为五组（n = 20）。使用玻璃纤维或聚乙烯纤维增强间接复合树脂。纤维要么经过光聚合后与间接复合树脂混合，要么在施加树脂后与间接复合树脂混合并一起聚合。未进行纤维增强的间接复合树脂用作对照。所有五种类型的试件在37°C的蒸馏水中储存24小时。一半的试件另外进行了热循环处理。然后对试件进行三点弯曲试验。使用立体显微镜检查并分类失效类型。数据采用双向方差分析和Tukey HSD检验进行分析。结果发现，纤维增强间接树脂复合材料的弯曲强度显著高于对照组。然而，纤维增强组之间没有呈现出任何显著差异。分析表明，老化不会影响间接复合树脂纤维增强的弯曲强度。该研究得出结论，纤维增强可提高间接复合树脂的弯曲强度。不同的纤维增强方法对间接复合树脂的弯曲强度表现出相似的效果。用玻璃纤维或聚乙烯纤维增强具有改善间接复合树脂机械性能的潜力。研究亮点：间接复合树脂的弯曲强度受玻璃纤维或聚乙烯纤维增强复合材料的影响。热循环老化对间接复合树脂的弯曲强度没有影响，然而可能会导致材料发生灾难性失效。
