Department of Biomaterials Science and Turku Clinical Biomaterial Center -TCBC Institute of Dentistry, University of Turku.
City of Turku Welfare Division, Oral Health Care.
Dent Mater J. 2019 Mar 31;38(2):196-202. doi: 10.4012/dmj.2018-102. Epub 2018 Nov 17.
The aim was to evaluate the effect of different zirconia discontinuous fiber fractions on radiopacity and other selected properties of glass discontinuous fiber-reinforced flowable composite (Exp-SFRC). Exp-SFRC was prepared by mixing 30 wt% of resin-matrix and 45 wt% of particulate-fillers to 25 wt% of various weight-fractions of E-glass/zirconia discontinuous fiber-fillers (25:0, 20:5, 15:10, 10:15, 0:25 wt%). Flexural strength and fracture toughness were determined for each experimental material. Radiograph of each Exp-SFRC and aluminium step wedge were taken to determine the radiopacity. Degree of conversion and light-transmission were also measured. Scanning electron microscopy was used to evaluate the microstructure of the Exp-SFRC. Analysis of variance (ANOVA) revealed that fractions of E-glass/zirconia discontinuous fiber-fillers had significant effect (p<0.05) on radiopacity and other tested properties of the Exp-SFRCs. Replacing low fraction of E-glass fiber with zirconia fiber-fillers can increase the radiopacity of the fiber-reinforced composite without deteriorating the mechanical properties, although, degree of conversion was decreased.
目的是评估不同氧化锆不连续纤维含量对玻璃不连续纤维增强流动性复合材料（Exp-SFRC）的射线不透性和其他选定性能的影响。Exp-SFRC 通过混合 30wt%的树脂基质和 45wt%的颗粒填充剂，以及 25wt%的各种重量分数的 E 玻璃/氧化锆不连续纤维填充剂（25:0、20:5、15:10、10:15、0:25wt%）来制备。对每种实验材料进行了弯曲强度和断裂韧性的测定。对每个 Exp-SFRC 和铝阶跃楔片进行射线照相，以确定射线不透性。还测量了转化率和透光率。扫描电子显微镜用于评估 Exp-SFRC 的微观结构。方差分析（ANOVA）表明，E 玻璃/氧化锆不连续纤维填充剂的分数对 Exp-SFRC 的射线不透性和其他测试性能有显著影响（p<0.05）。用氧化锆纤维填充剂代替低比例的 E 玻璃纤维可以增加纤维增强复合材料的射线不透性，而不会降低机械性能，尽管转化率降低了。
