Zayed Sara M, Alshimy Ahmad M, Fahmy Amal E
Department of Removable Prosthodontics, Faculty of Dentistry, Alexandria University, Alexandria, Egypt.
Department of Dental Biomaterials, Faculty of Dentistry, Alexandria University, Alexandria, Egypt.
Int J Biomater. 2014;2014:750398. doi: 10.1155/2014/750398. Epub 2014 Dec 9.
Current materials used for maxillofacial prostheses are far from ideal and there is a need for novel improved materials which mimic as close as possible the natural behavior of facial soft tissues. This study aimed to evaluate the effect of adding different concentrations of surface treated silicon dioxide nanoparticles (SiO2) on clinically important mechanical properties of a maxillofacial silicone elastomer. 147 specimens of the silicone elastomer were prepared and divided into seven groups (n = 21). One control group was prepared without nanoparticles and six study groups with different concentrations of nanoparticles, from 0.5% to 3% by weight. Specimens were tested for tear strength (ASTM D624), tensile strength (ASTM D412), percent elongation, and shore A hardness. SEM was used to assess the dispersion of nano-SiO2 within the elastomer matrix. Data were analyzed by one-way ANOVA and Scheffe test (α = 0.05). Results revealed significant improvement in all mechanical properties tested, as the concentration of the nanoparticles increased. This was supported by the results of the SEM. Hence, it can be concluded that the incorporation of surface treated SiO2 nanoparticles at concentration of 3% enhanced the overall mechanical properties of A-2186 silicone elastomer.
目前用于颌面修复体的材料远非理想，因此需要新型改良材料，尽可能模仿面部软组织的自然特性。本研究旨在评估添加不同浓度的表面处理二氧化硅纳米颗粒（SiO2）对颌面硅橡胶弹性体临床重要力学性能的影响。制备了147个硅橡胶弹性体标本，并分为七组（n = 21）。制备了一组不添加纳米颗粒的对照组和六组添加不同浓度纳米颗粒的研究组，纳米颗粒重量浓度从0.5%到3%不等。对标本进行撕裂强度（ASTM D624）、拉伸强度（ASTM D412）、伸长率百分比和邵氏A硬度测试。采用扫描电子显微镜（SEM）评估纳米SiO2在弹性体基质中的分散情况。数据通过单因素方差分析和谢费检验（α = 0.05）进行分析。结果显示，随着纳米颗粒浓度的增加，所有测试的力学性能都有显著改善。扫描电子显微镜的结果证实了这一点。因此，可以得出结论，添加浓度为3%的表面处理SiO2纳米颗粒可增强A - 2186硅橡胶弹性体的整体力学性能。
