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目的探讨氮气等离子体注入改性对聚醚醚酮(PEEK)粘结强度的影响,阐明其改善粘结性能的机理。方法按照改性参数不同,将制备的PEEK标准试件随机分为对照组、浸没组、低脉冲组和高脉冲组,每组20个。采用扫描电镜(SEM)观察各组试件的微观形貌变化,分别以Rely X~(TM) Unicem和SE BOND为粘结剂制备粘结试件,水浴24h后,测试试件的剪切强度,体视显微镜评价各组破坏模式。结果浸没组、低脉冲组表面可见颗粒状凸起结构,高脉冲组表面有柱状纳米结构;X线光电子能谱(XPS)分析结果证实,改性组材料表面均引入了氮元素;剪切强度结果表明,高脉冲组>低脉冲组>浸没组>对照组(P<0.01);而且以Rely X~(TM) Unicem为粘结剂时,未处理组剪切强度极其微弱;相同的改性处理组,以SE BOND为粘结剂获得的剪切强度高于以Rely X~(TM) Unicem(P<0.05)。体视显微镜观察,断裂模式主要以界面破坏为主。结论氮气等离子体浸没离子注入改性可显著提高PEEK口腔修复材料的粘结强度。
Objective To investigate the effect of nitrogen plasma injection modification on the bond strength of polyetheretherketone (PEEK), and to clarify the mechanism of improving the bond performance. Methods According to the different modification parameters, PEEK standard specimens were randomly divided into control group, immersion group, low pulse group and high pulse group, with 20 in each group. Scanning electron microscopy (SEM) was used to observe the microstructural changes of the specimens. Rely X ~ (TM) Unicem and SE BOND were used as bonding agents to prepare the bonded specimens. After 24 hours in water bath, the shear strength The stereoscopic microscope was used to evaluate the failure mode of each group. Results X-ray photoelectron spectroscopy (XPS) analysis results showed that nitrogen was introduced into the surfaces of the modified materials. The shear strength The results showed that the shear strength of the untreated group was extremely weak when the Rely X ~ (TM) Unicem was used as binder in the high pulse group> low pulse group> immersion group> control group. The same modification In the treatment group, the shear strength obtained with SE BOND as binder was higher than that with Rely X ~ (TM) Unicem (P <0.05). Stereomicroscopy, fracture mode mainly to the interface damage. Conclusion Nitrogen plasma immersion ion implantation modification can significantly improve the bonding strength of PEEK oral repair materials.