一种含有银纳米颗粒和生物活性玻璃的实验性树脂基复合材料的力学性能
Mechanical properties of an experimental resin based composite containing silver nanoparticles and bioactive glass.
作者信息
Hanif Amjad, Ghani Fazal
机构信息
Amjad Hanif, BDS, MSc. (UK). Assistant Professor, Department of Dental Materials, Peshawar Dental College, Peshawar, Pakistan.
Fazal Ghani, PhD (London), FDSRCPSGlasg, FRSM (UK), MSc (London), BDS. BSc (Pesh). Advanced PG Certificate in Clinical Education (RCPSGlasg), Head of Department of Prosthodontics, Dean, Post Graduate Dental Sciences Peshawar Dental College, Peshawar, Pakistan.
出版信息
Pak J Med Sci. 2020 May-Jun;36(4):776-781. doi: 10.12669/pjms.36.4.1913.
OBJECTIVE
To compare the elastic modulus, flexural strength, and hardness of an experimental resin based composite (RBC) with and without containing silver nanoparticles (AgNPs) and bioactive glass (BAG) with a commercially available RBC.
METHODS
This study was conducted, during the period August 2016-May 2018, at the Department of Dental Materials, Peshawar Dental College, Peshawar (Pakistan) and Department of Chemistry, University of Montreal, Canada. Test specimens made in the commercial RBC acted as Group-1 (G1). An experimental RBC containing 70 wt % filler content was synthesized. It was first used as such to prepare test specimens to act as the experimental control group (G2). This RBC was then modified by adding various amounts of BAG (5%, 10% and 15%) and a fixed amount of 0.009% AgNPs to use the so modified RBCs for preparing the test specimens to belong to three groups (G3, G4 & G5). The AgNPs had been synthesized in situ by reduction of salt during photo-polymerization. Flexural strength (FS), elastic modulus (EM) and Vickers hardness were determined using universal testing machine and hardness tester respectively. Data were analyzed using one-way ANOVA and Tukey post-hoc test.
RESULTS
Except for G3 restorations showing significantly lower mean FS value, the FS for those in the other groups were not significantly different (p>0.05). Elastic modulus of the experimental RBC restorations was though higher than those of the others but the difference was statistically insignificant (p>0.05). Reduced Vickers hardness values were documented for the restorations in the G4 and G5 compared to those in the G3 but again the difference was insignificant (p>0.05). Flexural strength and hardness values of the test specimens in the experimental RBCs were significantly lower than those made in the commercial hybrid RBC (p<0.05).
CONCLUSION
BAG and AgNPs addition to the experimental RBC in the mentioned concentration adversely affected the tested mechanical properties.
目的
比较含与不含银纳米颗粒（AgNPs）和生物活性玻璃（BAG）的实验性树脂基复合材料（RBC）与市售RBC的弹性模量、抗弯强度和硬度。
方法
本研究于2016年8月至2018年5月期间，在白沙瓦牙科学院（巴基斯坦白沙瓦）牙科材料系和加拿大蒙特利尔大学化学系开展。用市售RBC制作的测试标本作为第1组（G1）。合成了一种填料含量为70 wt%的实验性RBC。首先直接用其制备测试标本，作为实验对照组（G2）。然后向该RBC中添加不同量的BAG（5%、10%和15%）以及固定量的0.009% AgNPs，用如此改性后的RBC制备测试标本，使其分属三组（G3、G4和G5）。AgNPs是在光聚合过程中通过盐还原原位合成的。分别使用万能试验机和硬度测试仪测定抗弯强度（FS）、弹性模量（EM）和维氏硬度。数据采用单因素方差分析和Tukey事后检验进行分析。
结果
除G3修复体的平均FS值显著较低外，其他组的FS无显著差异（p>0.05）。实验性RBC修复体的弹性模量虽高于其他修复体，但差异无统计学意义（p>0.05）。与G3组相比，G4和G5组修复体的维氏硬度值降低，但差异仍不显著（p>0.05）。实验性RBC中测试标本的抗弯强度和硬度值显著低于市售混合RBC制作的标本（p<0.05）。
结论
按上述浓度向实验性RBC中添加BAG和AgNPs会对测试的力学性能产生不利影响。
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