Faculty of Biomedical Engineering, Amirkabir University of Technology, Tehran, Iran.
Lasers Med Sci. 2011 Sep;26(5):553-61. doi: 10.1007/s10103-009-0699-7. Epub 2009 Jul 18.
The aim of this study was to investigate the effect of power density and irradiation time of an argon laser on the physico-mechanical properties of light-cured dental nanocomposites. The composites were cured with 260 mW/cm(2) and 340 mW/cm(2) power densities at different irradiation times. The degree of conversion (DC), flexural strength, flexural modulus, water sorption, solubility and reaction temperature were measured. The maximum DC (50%), which was achieved after approximately 20 s irradiation, and the reaction temperature rise (20°C) were demonstrated by composite containing 20% filler cured at 340 mW/cm(2). The composite with 25% filler cured at 340 mW/cm(2) showed the highest flexural strength and modulus, which were 32.2 MPa and 1.89 GPa, respectively. The minimum water sorption (3.8%) and solubility (1.2%) were achieved with the composite containing 25% filler cured at 340 mW/cm(2). Finally, the composite with 25% filler cured at 340 mW/cm(2) showed higher physico-mechanical properties.
本研究旨在探讨氩激光的功率密度和辐照时间对光固化牙科纳米复合材料的物理力学性能的影响。将复合材料用 260 mW/cm(2) 和 340 mW/cm(2) 的功率密度在不同的辐照时间下进行固化。测量转化率（DC）、弯曲强度、弯曲模量、吸水率、溶解度和反应温度。在 340 mW/cm(2) 下固化含 20%填料的复合材料，在大约 20 s 辐照后达到最大 DC（50%）和反应温度升高（20°C）。在 340 mW/cm(2) 下固化含 25%填料的复合材料表现出最高的弯曲强度和模量，分别为 32.2 MPa 和 1.89 GPa。在 340 mW/cm(2) 下固化含 25%填料的复合材料吸水率最低（3.8%）和溶解度最低（1.2%）。最后，在 340 mW/cm(2) 下固化含 25%填料的复合材料表现出更高的物理力学性能。
