Gao Shuai, Gao Shanshan, Xu Baohua, Yu Haiyang
State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, NO. 14, 3rd Section of Ren Min Nan Road, Chengdu 610041, China.
China-Japan Friendship Hospital, Yinghua Road, Chaoyang District, Beijing 100020, China.
Materials (Basel). 2015 Jul 27;8(8):4751-4767. doi: 10.3390/ma8084751.
The study determines the stability and durability of polyetheretherketone (PEEK) and a carbon fiber-reinforced PEEK (CFR-PEEK) with 30% short carbon fibers, a dental composite based on Bis-GMA and polymethylmethacrylate (PMMA) under the influence of different pH-values of the oral environment . Nanomechanical properties were investigated by nanoindentation and nanoscratch tests before and after incubation of the specimens at 37 °C for 30 days in artificial saliva with pH-values of 3, 7 and 10, respectively. Nanoindentation and nanoscratching tests were performed using the Hysitron TI950 TriboIndenter to evaluate the reduced elastic moduli, nanohardness, viscoelasticity, friction coefficient and residual scratch profiles. After treatment, the nanomechanical properties of unfilled PEEK did not change. The reduced elastic moduli and nanohardness of the carbon fiber-reinforced PEEK increased significantly. The reduced elastic moduli and nanohardness of CHARISMA decreased. The plasticity of all materials except that of the unfilled PEEK increased. This indicates that different pH-values of the artificial saliva solutions had no obvious influences on the nanomechanical properties of the PEEK matrix. Therefore, the aging resistance of the unfilled PEEK was higher than those of other materials. It can be deduced that the PEEK matrix without filler was more stable than with filler in the nanoscale.
该研究确定了聚醚醚酮（PEEK）以及含30%短碳纤维的碳纤维增强PEEK（CFR - PEEK）、一种基于双酚A缩水甘油醚（Bis - GMA）和聚甲基丙烯酸甲酯（PMMA）的牙科复合材料在口腔环境不同pH值影响下的稳定性和耐久性。通过纳米压痕和纳米划痕试验研究了试样分别在pH值为3、7和10的人工唾液中于37℃孵育30天前后的纳米力学性能。使用Hysitron TI950 TriboIndenter进行纳米压痕和纳米划痕试验，以评估约化弹性模量、纳米硬度、粘弹性、摩擦系数和残余划痕轮廓。处理后，未填充PEEK的纳米力学性能未发生变化。碳纤维增强PEEK的约化弹性模量和纳米硬度显著增加。CHARISMA的约化弹性模量和纳米硬度降低。除未填充PEEK外，所有材料的塑性均增加。这表明人工唾液溶液的不同pH值对PEEK基体的纳米力学性能没有明显影响。因此，未填充PEEK的耐老化性高于其他材料。可以推断，在纳米尺度上，无填料的PEEK基体比有填料的更稳定。
