南方医科大学学报2011，Vol.31Issue(12)：1957-1962,6.DOI:44-1627/R.20111209.1651.002
七种光固化复合树脂冷热循环后机械性能评价
Changes in mechanical properties of seven light-cured composite resins after thermal cycling
摘要
Abstract
Objective To examine the changes of the mechanical properties of 7 different light-cured composite resins after thermal cycling and the correlations between these properties.Methods Seven different light-cured composite resins,including 2 microfilled composites (A110:AH and ESTELITE ∑:ET),3 microhybrid composites (AELITE:AT,Z250:ZS,and CharmFil plus:CP),and 2 nanohybrid composites (Z350:ZH and Grandio:GD),were prepared into test specimens with a diameter of 12 mm and a thickness of 1.0 mm.The specimens were stored in distilled water at 37 ℃ for 24 h prior to 1 000thermal cycles of 5 ℃ for 15 s and 55 ℃ for 15 s.The biaxial flexural strength (of) was tested using the ball-on-three-ball method at a crosshead speed of 0.5 mm/min (ISO4049).The fracture surface was observed under scanning electron microscope (SEM),and the remaining specimens underwent Knoop hardness test with a 50-g loading for 10 s.Results The highest and lowest Weibull modulus was observed in AH (18.752) and AT (5.290) group,respectively.The highest and lowest biaxial flexural strength was observed in ZS (158.2 MPa) and ET (54.0 MPa) groups,respectively.The off of the tested materials decreased in the order of microhybrid composite,nanohybrid composite,and microfiller composite,and the of showed no significant difference between the composites with a similar filler (P＞0.05).The fracture number was positively correlated tothe strength of the material.The Knoop hardness numbers (H) was the highest in GD group (110.81+ 14.77 kg/mm2) and the lowest in AH group (42.81+ 1.91 kg/mm2).SEM showed that the interface region of the matrix and the filler was vulnerable to crack formation.Conclusion The nanohybrid composite resins better suit clinical applications than microhybrid composites.The applicability of Knoop hardness test in hardness measurement of the composite resins needs to be further demonstrated.关键词
光复合树脂/冷热循环实验/双轴挠曲强度/Knoop硬度Key words
light-cured composite resins/ thermal cycling/ biaxial flexure strength/ Knoop hardness分类
医药卫生引用本文复制引用
姜玲,陈从容,金东春,李敏镐,裴泰圣,周聪,张晓燕,朴永哲,金光春..七种光固化复合树脂冷热循环后机械性能评价[J].南方医科大学学报,2011,31(12):1957-1962,6.基金项目
Supported by Natural Science Foundation of Shandong Province (Z2006C01) and Scientific Research Foundation for the Returned Overseas Chinese Scholars of State Ministry of Education.教育部留学回国人员科研启动基金 （Z2006C01）
山东省自然科学基金重点项目(Z2006C01) （Z2006C01）
山东省卫生厅科技发展计划(2007HZ042) （2007HZ042）
山东省教育厅科技研究计划(J06L93) （J06L93）
