Garoushi Sufyan, Vallittu Pekka K, Lassila Lippo
Chin J Dent Res. 2017;20(3):137-143. doi: 10.3290/j.cjdr.a38768.
To evaluate and compare certain mechanical properties and wear of five commercial short-fibre reinforced composites (Alert, EasyCore, Build-It, TI-Core, and everX Posterior), in relation to their microstructural characteristics.
Fracture toughness, work of fracture, and flexural strength were determined for each material following ISO standards. The specimens (n = 6) were dry stored (37 °C for 2 days) before they were tested. A wear test was conducted with 15,000 chewing cycles using a dual-axis chewing simulator. Wear pattern was analysed by a three-dimensional (3D) noncontact optical profilometer. Scanning electron microscopy (SEM) was used to evaluate the microstructure of each composite material. The results were statistically analysed using ANOVA followed by post hoc Tukey's test.
everX Posterior exhibited the highest fracture toughness (2.4 MPa m1/2) among the materials tested (P < 0.05). EasyCore presented the highest flexural strength (125.4 MPa), which was not significantly different (P > 0.05) from Alert (119 MPa) and everX Posterior (120 MPa). Lowest wear values were found for EasyCore and Build-It (19 and 22 µm). TI-Core showed significantly higher wear depth (45 µm) than all other materials (P < 0.05).
Significant differences between commercial short-fibre reinforced composites were found for fracture toughness and wear.
评估并比较五种市售短纤维增强复合材料（Alert、EasyCore、Build-It、TI-Core和everX Posterior）的某些力学性能和磨损情况，并研究其与微观结构特征的关系。
按照ISO标准测定每种材料的断裂韧性、断裂功和弯曲强度。试样（n = 6）在测试前于37°C干燥保存2天。使用双轴咀嚼模拟器进行15000次咀嚼循环的磨损试验。通过三维（3D）非接触光学轮廓仪分析磨损模式。采用扫描电子显微镜（SEM）评估每种复合材料的微观结构。结果采用方差分析（ANOVA），随后进行事后Tukey检验进行统计学分析。
在测试材料中，everX Posterior的断裂韧性最高（2.4 MPa m1/2）（P < 0.05）。EasyCore的弯曲强度最高（125.4 MPa），与Alert（119 MPa）和everX Posterior（120 MPa）无显著差异（P > 0.05）。EasyCore和Build-It的磨损值最低（分别为19和22 µm）。TI-Core的磨损深度显著高于所有其他材料（45 µm）（P < 0.05）。
市售短纤维增强复合材料在断裂韧性和磨损方面存在显著差异。
